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Based in the West Midlands, we carry out the maintenance, service and repair of Marsh sewage treatment plants. These include Ensign, Ensign Ultra and Ultra Polylok models. With over 25 years experience in sewage solutions, including treatment plants, cesspools and septic tanks, our experienced service engineers have specialist knowledge and take pride in delivering exceptional customer service.

Marsh sewage treatment plant service

We offer full servicing of Marsh sewage treatment plants, for domestic and commercial properties alike. Our team of engineers have over 25 years of experience in the industry, and are highly knowledgeable at diagnostics of Marsh sewage solutions. Our team can identify any faults within the tank, and assess if your Marsh sewage treatment plant is fit for purpose. 


We recognise your sewage treatment system is a big investment and it's not something you want to replace in a hurry! When carefully maintained, a Marsh sewage treatment system can last over 20 years.


Our engineers can identify any warning signs and look to address them. This will maximise your tank’s potential and ensure it is functioning properly now, and in the future.

Sewage treatment plant repairs

As Marsh specialists, we are able to carry out repairs to extend your tank’s lifespan and ensure it is functioning safely, and in accordance to up to date regulations.


We stock a wide range of parts, so that we can offer quick and hassle-free repairs of your Marsh sewage treatment plant. Our team of service engineers have an extensive amount of experience in the industry, so you can be rest assured your Marsh sewage treatment plant is in safe hands. 


Make sure to regularly check the control panel for your tank, as there may be a fault present if it shows a red light and makes a noise. This is a good indication that you need a service engineer to assess the possible malfunction within the tank. 

​Contact us today for expert advice!​

Benefits of our service package

Peace of Mind

Get peace of mind that your system is maintained correctly and minimise the risk of unexpected breakdowns and nasty odours when you least want it!

Service report provided

We provide you with a service report after each visit to let you know how the plant is functioning and include detailed photos.

Prolong your system

A sewage system is a big cost outlay. Prolong the life of your system and ensure you get the best return from your investment 

Reminders so you don't forget

It's easy to forget so we will send you reminders when your service is due, providing you with even more peace of mind.

Meet your legal requirements

It's a legal requirement to ensure your system isn't polluting the environment and failure to comply. could result in fines

Fast repairs when needed

Most repairs are done during a service or breakdown call out as we keep a record of your system and carry spare parts for your system with us.

Why use us?


Top rated customer service

We’ve built up a reputation for being friendly, professional and 100% reliable. You can count on us for excellent service.


We know our stuff

 Our 30 year proven track record of installing wastewater solutions speaks for itself. We're specialists when it comes to the installation, maintenance and repair of sewage systems



Integrity and honesty are core to what we do. We're a family-owned business and are known for being trustworthy and hard working.

            Contact us today for advice 

            0121 461 4861 

Useful information about Marsh sewage treatment plants


Here are some frequently asked questions about the maintenance of Marsh sewage treatment systems:

Can you service my Marsh sewage treatment plant?


At Cotterill Environmental, we are approved suppliers of maintenance and repairs of Marsh sewage treatment systems. 


We provide services and maintenance for a range of sewage treatment plants by Marsh. These include Ensign, Ensign Ultra and Ultra Polylok models. The Ensign Ultra model is a popular choice for wastewater management, and has many benefits. These include having an advanced compressor in the alarm as standard, and an innovative design which allows the tank to level itself within the ground. 

Marsh sewage treatment plants are available in a wide range of sizes, for both commercial and domestics properties without mains drainage access. They are a popular choice due to their cost-effective price. They are also highly reliable, and easy to install. This means you'll get the most out of your tank, with minimal maintenance costs. Marsh tanks have an innovative design, which means that there is a near silent noise level, and the quality of the final effluent is 97% removed of pollutants. 

Marsh tanks are tested and approved to BSEN12566-3/A1:2009. 


Marsh sewage treatment plants provide an efficient and cost-effective solution to off mains wastewater treatment. Domestic Marsh sewage treatment plants offer a modern alternative to other methods of treating effulent, providing you with a convenient storage solution for water when your main supply is not reachable.


Why choose Marsh?


Marsh sewage treatment plants are a popular choice for domestic and commercial clients looking for effective off-mains drainage solutions. They have a wide range of products to choose from, meaning that whatever your requirements, you're sure to find a tank which matches your needs and budget. The innovative design of the Ensign Ultra means that noise is reduced, and the final effluent quality is increased.

Why is it important to service your Marsh sewage treatment plant?


It is very important to get your Marsh sewage treatment plant regularly serviced for a number of reasons. 

1 - Regular servicing means that your product’s performance is being optimised. This means that any faults can be quickly and easily reported, and arrangements can be made swiftly with our service engineers to fix them. Having your Marsh sewage treatment plant regularly serviced gives you peace of mind that it is safe to use without the fear of becoming a hazard to your property or to the environment. 

2 - Costly repairs can be avoided with regular servicing. Any issues can be quickly addressed, which will save you time and money in the future.


3 - The product’s lifespan will be extended if it is properly maintained. Regular servicing will make your system last as long as possible. 

How often should you service your sewage treatment plant?

We recommend getting your sewage treatment plant serviced once a year for a domestic property, and between every six months to a year for commercial properties. Once on our system, our customers can opt into annual reminders for any maintenance services required. This gives peace of mind that your Marsh sewage treatment plant will be well looked after. 

What areas do we cover?

We cover the whole of the midlands and can also work further afield depending on the drainage project. Areas in the midlands that we cover include: 

Birmingham (West Midlands), Coventry (West Midlands), Hereford (Herefordshire), Lichfield (Staffordshire), Stoke-on-Trent Staffordshire), Wolverhampton (West Midlands), Worcester (Worcestershire), Shrewsbury (Shropshire), Warwick (Warwickshire), Derby (Derbyshire), Leicester(Leicestershire), Oakham (Rutland), Lincoln (Lincolnshire), Nottingham (Nottinghamshire), Buxton(Derbyshire), Glossop (Derbyshire), Cleethorpes (Lincolnshire), Northampton (Northamptonshire), Tamworth, Sutton Coldfield, Solihull, Lapworth, Knowle etc.  

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