Marsh Industries Ltd have been exhibiting and taking part in the wider workshops, forums and seminars at the IWA World Water Congress in Glasgow, Scotland.

Proceedings began on the Sunday with an Opening Ceremony at the SEC Armadillo. A thought provoking keynote speech “Respecting the Role of Water in the Earth System” delivered by 𝐏𝐫𝐨𝐟𝐞𝐬𝐬𝐨𝐫 𝐊𝐚𝐭𝐡𝐞𝐫𝐢𝐧𝐞 𝐑𝐢𝐜𝐡𝐚𝐫𝐝𝐬𝐨𝐧 of the University of Copenhagen, Denmark. Recognising the importance of water and its interconnectedness with the wider environment and our shared future.

The ribbon was then cut open to unveil the exhibition hall and give Michael Harrison, Stuart Thompson and Mark Bishop of Marsh Industries their first opportunity to meet with the ~7,000 delegates and visitors attending the IWA over the 5 day duration of the congress.

Over the course of the week we met with visitors from all corners off the world. From Greenland at the top through the Americas, Africa, Australasia, Europe and Asia. All with a common desire to do the right thing in their home location for the betterment of the environment.

Our thanks go to the Foreign, Commonwealth & Development Office (FCDO) for bringing an Indian delegation to meet the team on the stand and explore opportunities for off-mains drainage. We were supported by Dharmendra Nayee from our partner DND Construction Technicals in the UAE in this activity. Helping to quickly identify next steps for progression.

With the biannual global event taking place in Glasgow, it also gave an opportunity to catch up in person with many of our UK contacts and discuss ways in which we can work together.

Seminars and Workshops

Outside of the main exhibition hall, a daily programme of seminars, workshops and forums took place centring around the core six themes of the congress.

This provided an opportunity to continue to support the pressing issue of delivering Rainwater Management solutions in the UK. With sessions titled “From Drain to Gain” and “Managing Rainwater Where it Lands”. With sessions led by George Warren from Anglian Water and Matt Wheeldon of Wessex Water.

Dr. Julia Buckley lent government support to the topic and updated on the aim to make rainwater harvesting and greywater reuse a mainstream requirement in UK buildings, particularly new developments, rather than leaving adoption entirely voluntary. A significant case study from Belgium in particular showed what can be achieved. With domestic usage reduced to 80 litres per person per day in the Flanders region by implementing widescale rainwater harvesting. It was good to catch up at the congress with fellow champions of this topic Matt Hull ACIM, Stuart Stevenson and Lutz Johnen.

Whilst the climate is changing in the UK. There is the opportunity to learn from countries that have already encountered these conditions ahead of the UK. The “Millenium Drought” in Australia providing many learnings that can be utilised in the UK. With a multi source strategy being key.

To help bring the level of “energy” required to lift drinking water to a typical toilet cistern the Stoltman Brothers showed what it takes to lift this weight and show how rainwater management can be introduced to remove this requirement.

The Industrial Water forum gave an insight into the direction of travel for the much required need for increased water reuse in these settings. With less than 15% of industrial water being reused. The need to encourage companies to look at water in as a utility spend in the same way Gas and Electricity are considered was also noted. With the “cost of kit” to be considered against an eventual “cost of no water”

Alongside case studies of water reuse and redistribution in Morocco and the potential in Scotland. Looking at sustainable approaches to this topic.

Marsh Industries Ltd broad product range enables us to offer solutions in this field for domestic and commercial sewage treatment, oil water separators, pump chambers, condensate tanks, storage and rain water management.

We look forward to building on the momentum from the IWA Congress to support these key topics.

The post IWA World Water Congress appeared first on Marsh Industries.

Following the incredible success of last year’s 20,000 Miles for Smiles campaign, which saw Marsh Industries donate £23,450 to seven children’s hospitals and hospices across the UK, Sooey is back for another very special Christmas mission!

This year, Sooey is taking to the skies to support seven air ambulance charities, with Marsh Industries proudly committing £27,000, shared between the charities to help support the incredible work they do every day.

As Sooey embarks on his latest adventure, he’ll be travelling across the UK, visiting air ambulance bases, meeting the dedicated teams behind these lifesaving services, and shining a light on the vital work they carry out for families and communities.

Air ambulance services play a crucial role in delivering emergency care when every second counts, helping patients reach the specialist treatment they need. Through this year’s campaign, we hope to raise awareness of the extraordinary work these charities do and the importance of supporting them.

We invite you to follow Sooey’s journey, cheer him on, and discover more about the incredible organisations he’ll be visiting along the way.

Together, we can help Sooey spread smiles and support lifesaving care across the UK!

The seven air ambulance charities benefiting from this year’s campaign are:

• Air Ambulance Charity Kent Surrey Sussex (KSS)
• Dorset and Somerset Air Ambulance
• East Anglian Air Ambulance (EAAA)
• North West Air Ambulance (NWAA)
• The Air Ambulance Service (TAAS)
• Scotland’s Charity Air Ambulance (SCAA)
• Wales Air Ambulance Charity (WAAC)

Follow Sooey’s journey!

Check back here for campaign updates and follow Sooey’s adventures across our social media channels.

Follow us on LinkedIn, Facebook and Instagram to see where Sooey is heading next!

The post Sooey is back and bigger than ever! appeared first on Marsh Industries.

This sewage treatment plant buyers guide walks you through each decision. 

How to Choose a Sewage Treatment Plant: 7 Key Steps

Here’s how to choose a sewage treatment plant, starting with what matters most.

1. How Many People Will the Plant Serve?

Start by sizing your sewage treatment plant for house use based on the number of people it serves. Plants are rated in population equivalent (PE), which is roughly one person each. For new plants, sizing should follow British Water’s Flows and Loads guidance. Also, plan ahead, because an extension must not leave your plant undersized.

2. Where Will the Treated Water Go?

Whichever sewage treatment plant you choose, its discharge point decides the rules you follow. In England, the General Binding Rules set daily limits for each route.

Go over these limits, and you’ll usually need a permit or a sewer connection.

3. What Are Your Ground Conditions?

Your ground decides how deep the plant sits and how well the water drains. Before you pick a model, ask your installer to check these points:

• Percolation test results for the drainage field
• Water table depth during the wettest months
• Rock or heavy clay close to the surface
• Room for a tanker to reach the plant

High water tables make deep excavation harder, so a shallow plant can help. The Marsh Ensign-EL suits these sites, with a shallow and compact footprint.

Understanding sewage treatment plant regulations is important before installation, particularly when it comes to planning permission and the requirements for your property. Read our guide to planning permission for a sewage treatment plant to learn more.

4. Which Type of Plant Suits You?

Most types of sewage treatment plant use bacteria and differ in how they get air.

• Submerged aerated filter (SAF): bacteria grow on fixed media, fed with air by a blower.
• Activated sludge: bacteria float freely in an aerated chamber, then settle out later.
• Sequencing batch reactor (SBR): the plant treats wastewater in timed batches inside one chamber.
• Moving bed (MBBR): bacteria grow on small floating carriers that tumble in the tank.

If nitrate matters on your site, an SBR plant is worth a close look.

5. Is the Plant Certified to EN 12566-3?

An EN 12566-3 sewage treatment plant has passed independent tests for treatment performance. GOV.UK names BS EN 12566 as the standard for new small plants. Plus, British Water keeps a list of certified plants serving up to 50 people.

When you compare certificates, check:

• The PE range covered by the test
• Effluent quality results from the test
• Energy use recorded during testing

Ask for the certificate before you buy, and make sure the model name matches.

6. Do You Need Nutrient Removal?

Some sites need cleaner water than a standard plant can deliver. Natural England has required nutrient neutrality for new development across 27 river catchments. There, new homes must not add to the nutrient burden in local rivers. A nutrient neutrality sewage treatment plant helps by removing phosphate and nitrate at source.

However, Natural England began consulting on its first Environmental Delivery Plan in September 2026. Until a plan covers your area, check your council’s current nutrient rules.

Where phosphate is the main concern, a phosphate removal sewage treatment plant setup makes sense. Marsh offers three options:

• Phos-Lite: reduces phosphate without chemical dosing, using naturally occurring media.
• Nutra-Lite: an SBR plant that cuts biological nitrates.
• Marsh Gemini: combines both systems in one unit to save space.

7. What Will It Cost to Run?

Running costs last for the plant’s whole life, so compare them before you buy. Budget for these three costs every year:

1. Electricity for the air blower, which runs around the clock
2. Desludging at least once a year by a registered waste carrier
3. Servicing by a competent engineer, such as one from British Water’s accredited list

Check the power figures on each datasheet, because similar plants can use different amounts.

Start With Your Site, Then Pick Your Plant

The best domestic sewage treatment plant suits your site and holds the right certificate. Now that you know how to choose a sewage treatment plant, start with your discharge point. Then size it, and check its certificate before anything goes in the ground.

Marsh also offers wider drainage solutions for sites with pumping or rainwater needs. Contact the Marsh technical team with your site details for a sizing recommendation.

Frequently Asked Questions

Can one domestic sewage treatment plant serve two houses?

Yes, a shared domestic sewage treatment plant works if it’s sized for every home. For new developments, the sewer distance rule multiplies 30 metres by the number of houses. Agree on servicing and emptying costs in writing between neighbours before installation.

Can I install a plant near a protected nature site?

Often not under the General Binding Rules, which exclude surface water discharges near protected sites. These include discharges within 500 metres of a biological SSSI. Check your location on Defra’s Magic map before you choose a plant.

Do I need to register my plant in Wales or Scotland?

Yes, in most cases, as each nation runs its own system. In Wales, you register your plant with Natural Resources Wales. In Scotland, SEPA handles authorisation, so contact them before you choose a model.

Can I install a domestic sewage treatment plant myself?

You need Building Regulations approval for any new plant, whoever does the work. The plant must also be installed to the manufacturer’s specification. So book an experienced installer, and keep the commissioning paperwork safe.

What should I keep after installing my plant?

Keep the plant’s manual and its EN 12566-3 sewage treatment plant certificate together. Add every service and emptying record as you go. When you sell, the new owner must receive these details in writing.

The post How to Choose the Right Domestic Sewage Treatment Plant? appeared first on Marsh Industries.

That difference in treatment decides where each system can legally send its water. It also shapes your running costs. Let’s look at the difference between septic tank vs sewage treatment plant.

What Is a Septic Tank and How Does It Work?

A septic tank is a buried tank that separates your household wastewater into layers. 

• Heavy solids sink to the bottom as sludge
• Fats and grease float to the top as scum

The liquid in the middle then flows out to a drainage field, which is a series of perforated pipes laid in trenches. As that liquid trickles through the soil, natural bacteria in the ground complete the treatment.

As septic tanks have no motor or pump, they run without electricity and have very few parts to fail. However, they only partly treat the wastewater. Plus, they rely on well-draining ground to finish the job.

What Is a Sewage Treatment Plant and How Does It Work?

A sewage treatment plant, also called a package sewage treatment plant, treats sewage to a higher standard than a septic tank. It works in stages inside one tank: 

• It starts with a primary chamber where the solids settle out
• The liquid then moves into a biological chamber. Here, an air blower feeds oxygen to helpful bacteria. 
• These bacteria break down the waste
• A final settlement stage lets the last fine particles drop away

The water that leaves the tank is far cleaner. Hence, it can go to a drainage field or, where the rules allow, a watercourse. 

That flexibility is the main reason homeowners on difficult sites upgrade to a sewage treatment plant. 

What Is the Difference Between a Septic Tank and a Sewage Treatment Plant?

The main difference between a septic tank and a sewage treatment plant is how far each one treats the wastewater. Let’s compare both side-by-side:

Put simply, a septic tank suits a site with free-draining ground and room for a drainage field. A treatment plant suits sites with poor ground or a stream nearby. Plus, it gives you more discharge options.

Can a Septic Tank Discharge to a Watercourse?

No, in England a septic tank cannot discharge directly to a watercourse such as a river or stream. The Environment Agency’s General Binding Rules require a small sewage treatment plant for any discharge to surface water. So if you have a septic tank discharge to watercourse setup, you must act as soon as possible. The official guidance gives you three routes to fix it:

• Connect your property to a public foul sewer.
• Replace your septic tank with a small sewage treatment plant.
• Install a drainage field so the water soaks into the ground, and check you meet the rules for ground discharges.

You must have plans in place to complete this work within a reasonable timescale, which is usually 12 months. Furthermore, if you buy or sell a home with this setup, agree who pays for the upgrade as a condition of sale.

These rules cover England only, and the other UK nations have their own regulators. In Scotland, check the guidance from SEPA, and in Wales, check with Natural Resources Wales.

Septic Tank vs Treatment Plant Cost: What Should You Budget For?

When you weigh up septic tank vs treatment plant cost, a septic tank usually costs less to buy, because it is a simpler tank with no moving parts. A sewage treatment plant costs more upfront. This is because it has a blower and several internal chambers. 

Installation adds to both. And the final figure depends on your ground conditions and how easy the site is to reach.

Running costs follow the same pattern. Septic tanks use no power. And they need regular emptying by a registered waste carrier. A treatment plant also needs emptying. Plus, it requires routine servicing to keep its blower and parts in good order.

Do I Need a Septic Tank or Sewage Treatment Plant?

If you are asking, “Do I need a septic tank or sewage treatment plant?”, your site decides the answer. So, start by working out where the treated water will go. If a public sewer runs nearby, check that option first. Why? Because it removes the need for either system. 

For a new system serving one home in England, you cannot rely on the General Binding Rules if a public foul sewer lies within 30 metres of your boundary.

If the sewer is out of reach and your ground drains well, a septic tank with a drainage field may suit you. A drainage engineer can run a percolation test to show how quickly your soil absorbs water. However, a sewage treatment plant is the better fit in these situations:

• The treated water needs to discharge to a stream or river.
• Your ground drains poorly, such as heavy clay or a high water table.
• You are replacing an old septic tank that currently empties into a watercourse.
• You want the option to discharge to ground or water in the future.

Learn more about septic tank regulations and ensure your system meets current requirements. Read our guide to septic tank compliance. 

Find Your Discharge Point, Then Choose Your System

A septic tank suits free-draining ground with space for a drainage field. Plus, it runs without power. A sewage treatment plant cleans water to a higher standard. Hence, it opens up more sites and discharge options. 

Start by finding where your wastewater goes today, because that one detail usually settles the choice.

If your project also needs to manage rainwater run-off, a sustainable drainage system can work alongside your wastewater setup. A small step now saves a costly fix later, especially if your current tank empties into a stream.

Speak to the Marsh technical team for help sizing the right system for your property.

Frequently Asked Questions

Is a package sewage treatment plant the same as a sewage treatment plant?

Yes, both names describe the same system, as GOV.UK confirms. A package sewage treatment plant simply has all the treatment stages built into one factory-made unit, ready to install.

Can I convert my septic tank into a sewage treatment plant?

In some cases, yes, using a septic tank conversion unit such as the Marsh Uni: Gem. For a watercourse discharge, the unit must meet the relevant British Standard. Send Marsh your tank size and discharge point first, and the team can confirm whether conversion suits your site.

How often does a sewage treatment plant need emptying?

You should have the sludge removed at least once a year, or as the manufacturer advises. Book a registered waste carrier and ask to see their waste carrier certificate on the day.

Do I need permission to install a sewage treatment plant?

A new treatment plant needs Building Regulations approval, and some projects need planning permission too. Contact your local building control team before work starts.

The post Septic Tank vs Sewage Treatment Plant: What’s the Difference? appeared first on Marsh Industries.

Hosted by Waterwise, the UK’s leading independent organisation dedicated to promoting water efficiency and reducing water waste, the Summit brought together voices from across the water sector to discuss the challenges facing the UK’s water supply and, importantly, what we can do to address them.

With population growth, ageing infrastructure and climate change increasing pressure on our water resources, the need to act is becoming increasingly urgent.

The growing challenge

One of the key messages from the Summit was the scale of the challenge facing the UK.

Without significant changes to the way we use and manage water, England could face a 5 billion litre public water shortage every day by 2055.

This puts the importance of water efficiency and reuse firmly into perspective. While the UK is often associated with frequent rainfall, having access to water and making effective use of it are two very different things.

The Summit provided an opportunity to discuss how we can reduce demand, protect our water resources and build a more resilient future.

Putting water reuse into the spotlight

Water reuse was at the heart of the Summit’s discussions.

One simple but powerful example is rainwater harvesting.

We currently use drinking-quality water for many everyday activities that don’t necessarily require potable water – including flushing toilets, washing clothes and watering gardens.

So why not reuse rainwater for these applications instead?

Rainwater harvesting provides an opportunity to capture and reuse water that would otherwise be lost, helping to reduce reliance on mains water and make better use of an existing natural resource.

At Marsh Industries, we manufacture rainwater harvesting systems designed to help households and businesses reduce their mains water consumption and take a more sustainable approach to water management.

Find out more about Marsh Industries Rainwater Harvesting

Bringing the industry together

The Summit brought together representatives from across the sector, providing an opportunity to hear different perspectives on the UK’s water challenges and the role innovation can play in addressing them.

The event also attracted senior representatives from leading industry organisations, including the Future Water Association, Builders Merchants Federation, British Water and the National Self Build Centre, alongside major trade press organisations. Their presence highlighted the growing importance of water reuse across the wider construction, water and building sectors.

Speakers included:

• Lee Pitcher MP, Doncaster
• Julia Buckley MP, Shrewsbury
• Professor Amin Al-Habaibeh of Nottingham Trent University
• Nicci Russell of Waterwise
• George Warren of Anglian Water
• Julian Webster and Nithya Anne Thomas of Affinity Water
• Michael Farnsworth of Stormsaver
• Steve Boyer of Marsh Industries

Alongside the presentations, attendees took part in group discussions exploring the challenges we face and how we can prevent further decline in water availability.

For Marsh Industries, it was an important opportunity to contribute to the conversation and share our experience of developing practical solutions that can help reduce water consumption.

Innovation has a role to play

A clear message from the Summit was that innovation will be key to scaling water reuse across the UK.

We cannot wait until water shortages become an even bigger problem before taking action.

Every drop of water we can save, reuse or manage more effectively can make a difference. Rainwater harvesting is just one example of how relatively simple changes can contribute to a much bigger solution.

The challenge is significant, but so is the opportunity.

If water reuse became more widely adopted across homes, businesses and developments, the cumulative impact could be substantial.

At Marsh Industries, we believe the industry has a responsibility to continue developing and promoting solutions that help make better use of our most valuable natural resource.

We shouldn’t wait for the problem to start. We can take action now – and help soften the impact of the challenges ahead.

Every drop matters.

Marsh Industries – delivering innovative solutions for a more sustainable future.

The post Marsh Industries joins industry leaders at Water Reuse Summit in London appeared first on Marsh Industries.

As the construction and infrastructure sectors place increasing emphasis on greener and more environmentally responsible drainage solutions, Marsh Industries has continued to examine and independently verify the effectiveness of its separator technology when incorporated into Sustainable Drainage Systems (SuDS).

The company has tested the Marator separator for total suspended solids and metal reduction in line with industry-recognised procedures at the PIA notified test facility in Aachen, Germany. This testing complements the product’s existing EN 858-1 certification for light liquid separators.

Combining the certified separator performance with additional mitigation testing demonstrates the Marator’s ability to achieve outstanding pollutant reduction, including:

The hydrocarbon performance represents a significant improvement over the BS EN 858-1 Class 1 requirement of less than 5 mg/l, demonstrating the Marator’s capability where enhanced environmental protection is required.

These independently verified results give specifiers increased confidence when selecting treatment equipment for sensitive surface-water applications and help position the Marator as a comprehensive treatment solution for SuDS schemes, highways, commercial developments, distribution centres, industrial sites and other environmentally sensitive locations. With its unique design the Marator minimises micro-plastics from entering the watercourses and the drainage network.

Marsh Industries Chairman Steve Boyer, who oversaw the original testing programme, said:

“It is almost taken for granted that products such as separators have a positive environmental role, but consultants, contractors and regulators increasingly want independently verified evidence of exactly what that equipment can achieve.”

“With the Marator, we have gone considerably further than simply demonstrating compliance with the traditional Class 1 hydrocarbon standard. Independent testing has demonstrated less than 0.1 mg/l hydrocarbons in the final effluent, alongside 84.35% particle retention and 63.26% total metal reduction.”

“These results provide consultants and specifiers with meaningful performance data and demonstrate why the Marator should be considered where a higher level of surface-water protection is required.”

The Marator forms part of Marsh Industries’ continuing investment in independently tested and certified water-management products, supported by UK manufacturing, technical design assistance and specialist sales support.

Read more about the Marsh Marator here.

For further information, or to discuss your next SuDS project, contact Marsh Industries at sales@marshindustries.co.uk or call 01933 654582

The post Marsh Marator SuDS SAFE provides surety for specifiers appeared first on Marsh Industries.

Designed for architects, consulting engineers, housebuilders, developers and drainage professionals, our CPD sessions provide practical, up-to-date guidance on off-mains drainage, wastewater treatment and sustainable water management. Whether delivered at your office or as part of a virtual session, our training is tailored to help specification professionals make informed decisions from the earliest stages of project design.

Technical Expertise You Can Trust

Our CPD programme draws on decades of combined industry experience. Rather than delivering a sales presentation, our aim is to provide valuable technical knowledge that delegates can immediately apply to current and future projects.

Each session explores the key considerations when specifying wastewater treatment systems, pump stations and associated drainage products, helping attendees understand current regulations, design requirements and common specification challenges.

Our interactive approach encourages discussion, allowing delegates to ask project-specific questions and benefit from practical guidance from industry experts.

Michael Harrison – Business Development Director

Mark Bishop – Contract Sales Manager

Supporting Better Specification

A successful specification goes beyond selecting the right product. It requires accurate technical information, reliable design support and confidence that the chosen solution will meet regulatory requirements.

To complement our CPD programme, Marsh Industries provides an extensive range of free technical resources, including:

• BIM and CAD objects
• NBS specifications
• Product datasheets
• Technical drawings
• Installation and operation manuals
• Certification documents
• Design support from our technical team

These resources enable architects and engineers to integrate Marsh products into their designs efficiently while reducing specification time and improving project accuracy.

BIM Resources That Simplify Design

Our BIM and CAD Library has been developed to support modern digital construction workflows. By providing accurate product models and technical information, designers can confidently incorporate Marsh solutions into BIM-enabled projects, improving coordination, reducing clashes and streamlining the design process.

Combined with our Technical Library, these resources ensure specifiers have access to the latest documentation whenever they need it, helping projects progress smoothly from concept through to construction. You can visit our BIM and CAD Library here.

Delivered Nationwide

Marsh Industries delivers CPD sessions to practices and organisations throughout the UK. Whether you’re a small architectural practice, multidisciplinary consultancy or national developer, our team can arrange training at a time and location that suits you.

Our sessions are informative, engaging and designed to provide genuine value, equipping delegates with practical knowledge that supports compliant, sustainable and efficient wastewater system design.

Book Your CPD Session

If your team would like to expand its knowledge of off-mains drainage, wastewater treatment and specification best practice, we’d be delighted to help.

To arrange a CPD session or find out more about the topics we cover, contact the Marsh Industries team today. Together, we’ll help ensure your next project starts with the right technical knowledge and the right support.If your team would like to expand its knowledge of off-mains drainage, wastewater treatment and specification best practice, we’d be delighted to help.

To arrange a CPD session or find out more about the topics we cover, contact the Marsh Industries team today. Together, we’ll help ensure your next project starts with the right technical knowledge and the right support.

The post Marsh Industries Delivers Expert CPD Training for Architects, Engineers and Construction Professionals Across the UK appeared first on Marsh Industries.

Do I need planning permission?

The answer depends on your project, your property’s location and how the treated water will be discharged. In many cases, planning permission isn’t required for a straightforward replacement, but there are other regulations you’ll still need to comply with, including Building Regulations and environmental legislation.

This article explains what you need to know before installing a sewage treatment plant in England, Scotland and Wales.

When Is Planning Permission Required?

For many domestic properties, replacing an existing wastewater system with a new sewage treatment plant is considered a like-for-like improvement and planning permission may not be required.

However, planning permission could be necessary if:

• You’re building a new property.
• The installation forms part of a larger development.
• The system is located within a Conservation Area, National Park or Area of Outstanding Natural Beauty (where additional planning controls may apply).
• The installation significantly alters the appearance or use of the site.
• Your local planning authority requires approval due to site-specific conditions.

Because every site is different, it’s always worth checking with your local planning authority before work begins.

What About Building Regulations?

Even if planning permission isn’t required, your installation will normally need to comply with Building Regulations.

Building Regulations help ensure the drainage system is designed and installed safely, protecting both the property and the environment.

They cover areas such as:

• Correct sizing of the sewage treatment plant.
• Suitable pipework and drainage layout.
• Ventilation requirements.
• Installation standards.
• Safe discharge arrangements.

Your installer or drainage designer should be familiar with these requirements and ensure the installation meets the relevant standards.

Environment Agency Requirements (England)

In England, small domestic sewage discharges are regulated by the Environment Agency through the General Binding Rules.

These rules are designed to protect rivers, streams, groundwater and the wider environment.

Depending on your installation, you’ll need to consider:

• Where treated wastewater will discharge.
• Whether your property qualifies under the General Binding Rules.
• Whether an environmental permit is required.
• Ongoing maintenance and servicing responsibilities.

For many domestic sewage treatment plants that meet the required standards, an environmental permit isn’t needed, provided the installation complies with the General Binding Rules.

However, if your system falls outside these rules, additional permissions may be required.

Environment Agency Requirements Permits

What Are the General Binding Rules?

The General Binding Rules are a set of legal requirements that govern small sewage discharges in England.

They include guidance on:

• The type of treatment system you can install.
• Where treated water can be discharged.
• Maximum discharge volumes.
• Maintenance responsibilities.
• Protecting nearby watercourses and groundwater.

If you’re replacing an older septic tank that discharges directly to a watercourse, you may need to upgrade to a compliant sewage treatment plant.

Understanding these rules before purchasing a new system can help avoid costly changes later. We have a news update that goes through the details of the general binding rules, in a deeper context, if you would like to read this, click here.

Regulations in Scotland

Wastewater regulations in Scotland differ from those in England.

The Scottish Environment Protection Agency (SEPA) regulates private wastewater treatment systems through the Water Environment (Controlled Activities) Regulations, commonly known as CAR.

Depending on your installation, you may need:

• Registration or authorisation.
• Compliance with discharge limits.
• Approval for your discharge location.
• Building warrant approval where applicable.

If your property is located in Scotland, it’s important to follow SEPA guidance before installing or replacing any wastewater treatment system.

Regulations in Wales

In Wales, wastewater discharges are regulated by Natural Resources Wales (NRW).

While many of the principles are similar to those in England, the guidance and permitting process can differ.

Before installation, homeowners should check:

• Discharge requirements.
• Environmental permitting.
• Building Regulations.
• Any local planning requirements.

If you’re unsure, your installer or drainage specialist should be able to advise on the latest Welsh regulations.

Other Things to Consider Before Installation

Alongside permissions and regulations, there are several practical factors that should be considered before choosing your sewage treatment plant.

These include:

• Ground conditions.
• Groundwater levels.
• Available installation space.
• Access for maintenance.
• Power supply.
• Discharge location.
• Population Equivalent (PE) requirements.

Taking these factors into account during the planning stage can help ensure your system performs efficiently for many years.

Conclusion

For many homeowners, installing or replacing a sewage treatment plant does not require planning permission, but that doesn’t mean there are no rules to follow.

Building Regulations, environmental legislation and the relevant guidance for your nation of the UK all play an important role in ensuring your wastewater system is safe, compliant and environmentally responsible.

If you’re unsure about what’s required for your property, it’s always best to speak with your local planning authority, environmental regulator or a trusted drainage specialist before work begins.

At Marsh Industries, we’re here to help. Our knowledgeable team can guide you through the process, helping you choose the right wastewater solution while providing technical advice to support your project from start to finish. Get in touch with our team today!

The post Do I Need Planning Permission for a Sewage Treatment Plant? appeared first on Marsh Industries.

Taking home the Gold Award for Business Innovation, Marsh Industries was recognised for its ongoing commitment to developing forward-thinking solutions within the wastewater and drainage sector. This award highlights the company’s dedication to continuous improvement, product development, and delivering practical, efficient solutions for customers across the UK.

In addition to this success, Marsh Industries was also awarded Silver for Sustainability, reflecting the company’s strong focus on environmentally responsible practices. From manufacturing processes through to product design, sustainability remains a key priority as Marsh continues to reduce its environmental impact while supporting customers in meeting regulatory and environmental standards.

The awards evening brought together a wide range of businesses from across the region, celebrating innovation, resilience, and excellence within the SME community. It was a fantastic opportunity to connect with other organisations and recognise the achievements of businesses making a real impact in their industries.

These awards are a testament to the hard work, expertise, and dedication of the entire Marsh team. Their ongoing commitment to quality, innovation, and sustainability continues to drive the business forward and strengthen its position within the industry.

Marsh Industries would like to thank the SME Business Awards for hosting such a memorable event and extend congratulations to all the other finalists and winners on the night.

The post Marsh Industries Celebrates Double Win at SME Business Awards appeared first on Marsh Industries.

The General Binding Rules (GBRs) are the legal standards that regulate small sewage discharges from septic tanks and sewage treatment plants in England. The General Binding Rules (GBRs) 2015 were implemented on January 1, 2015, to govern small sewage discharges in England. They set out requirements for small sewage discharges, including that new systems must not discharge untreated sewage into open water and must use a septic tank or small sewage treatment plant. Identifying that for discharges to surface water, a small sewage treatment plant would be required, while septic tanks would need to discharge to a drainage field in the ground. 

These rules were then further tightened in 2020 – most notably banning existing septic tanks from discharging directly into surface water. Owners with such systems had to upgrade or replace them by this date, or by the time they sold their property if that came first. These rules also include general requirements for septic tanks and sewage treatment plants, such as correct installation, regular maintenance, and regular emptying. 

In 2023, further clarification and enforcement updates have been made with reference to combined discharge and distances between discharge points. Homeowners, property buyers, sellers, and installers should ensure their systems remain compliant to avoid pollution, legal issues, and costly last-minute upgrades.

Below is a breakdown of what has changed – and how Marsh Industries can help you stay on the right side of the rules.

What’s changed in 2023?

While the core 2020 rules still apply, the 2023 update strengthened enforcement, responsibility, and evidence requirements:

1. Increased enforcement around surface water discharges
   Regulators are now actively checking rural and semi-rural areas for systems that still discharge directly to streams, rivers, ditches, lakes, or coastal waters.
2. Under the 2023 update, no septic tank may discharge directly to surface water under any circumstances.
3. Greater emphasis on proving compliance
   Homeowners are now expected to provide documented evidence of compliance when:
   • Selling a property
   • Refurbishing or extending a property
   • Replacing or upgrading off-mains systems
   • Responding to an Environmental Health query
   This includes showing how wastewater is treated, where it discharges, and when the system was last serviced.
4. Responsibility extends to new property owners
   Buyers inherit the legal responsibility for any non-compliant system.
5. The 2023 update stresses that sellers must disclose the type of system installed and confirm whether it meets current regulations.
6. Drainage fields must meet BS 6297
   Where a drainage field is used, it must be designed and installed in accordance with BS 6297.(link to web definition of the standards)
7. Many older soakaways no longer meet this standard, meaning assessment or replacement may be required.
8. Sites with limited space face stricter scrutiny
   If a drainage field is not feasible (e.g., clay soils, high water table, small plots), the system must be upgraded to a sewage treatment plant (link to sewage tp page) or an approved conversion unit.(link to uni-gem page).  In doing so creating an acceptable level of effluent discharge to surface water.

Current compliant discharge options (2023)

If your septic tank currently discharges to surface water, the law requires you to upgrade.

The 2023 rules allow the following compliant options:

1. Connect to mains sewer (where possible)
If access to a public sewer exists, connection is the simplest compliant option.Pump chambers can be used if the site is low-lying.

2. Install a drainage field (BS 6297 compliant)
This allows treated wastewater to percolate safely into the ground.However, with space or percolation constraints this option is not suitable for all sites.

3. Install a septic conversion unit such as the Uni:Gem
A compliant solution where the existing septic tank can be retained.A conversion unit treats effluent to a high enough standard to discharge to surface water.  The appropriate functionality  of the existing septic tank and its ability to treat the relevant flows and loads should be taken into account.

4. Upgrade to a full sewage treatment plant
This is the most common route.A modern treatment plant treats wastewater to a much higher standard and removes the need for a drainage field.

How Marsh Industries can help you meet the 2023 rules

Marsh offers a range of off-mains solutions – from small domestic systems to large commercial plants – ensuring full compliance with the General Binding Rules.

Marsh Ensign Sewage Treatment Plants

• Tested and approved to BS EN12566-3/A1:2009(link)
• High treatment performance (97% pollutant removal)
• Available in Ultra, Standard and Shallow variants
• Suitable for 4–50PE applicationsA reliable and economical long-term solution for complete replacements.

Marsh sewage treatment plants

Marsh Ultra:Polylok L

• Innovative, compact domestic treatment plant
• High performance: 20:30:20 effluent quality
• Available in 6PE and 12PEIdeal for sites needing fast, straightforward installation.

Marsh Ultra:Polylok L

Uni:Gem Septic Conversion Unit

• Converts an existing septic tank into a compliant treatment system
• Suitable for domestic, commercial, and agricultural applications
• Allows continued discharge to surface waterPerfect where a drainage field or full system replacement isn’t feasible.

Marsh Uni:Gem septic conversion unit

Need help achieving 2023 compliance?

Marsh Industries provides complete off-mains wastewater solutions and can guide you through every stage – from assessment to installation.

Call us: 01933 654582 | Email: sales@marshindustries.co.uk
 

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