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Sewage Treatment Plants

Sewage treatment plants are a sustainable choice that offer numerous advantages over traditional septic tanks. Whether you're upgrading from an old system or starting fresh, sewage treatment plants are a great option for properties off the grid.

A New Sewage Treatment Plant

Why choose us for your sewage treatment plant?

At Cotswold Drainage we offer a 25-year guarantee along with an annual service and maintenance contract for all new sewage treatment plants.

Our team are highly experienced with installations, one of our main areas of expertise.

If you have an existing septic tank, you're buying a new home, or you want to learn more, contact our friendly team today.


Get in touch

Contact our friendly and professional team via form, phone or email for any drainage issues you may have.

From blocked drains to septic tank repairs and replacements, we're here to help. We have over 25 years of experience and offer 24/7 emergency callouts.


Luke and his colleague were efficient, friendly and very professional. They arrived on time, kept me well informed and were just brilliant all round. I'd previously used a well known, national company and the contrast was remarkable. The previous company provided me with very little information, they refused to guarantee their work because a manhole was covered with a slab and once the blockage was cleared they left. Cotswold Drainage guaranteed their work and cleared the underlying problem, rather than the symptom. An all round excellent company to deal with.
- L Lynass
A great, straightforward service, thank you! Customer service is excellent - there was a problem with the date we originally booked, but it was quickly resolved by Richard, and he was very apologetic. The engineer who came out was Adrian. He was on time, called ahead of arrival as requested, and was very polite. Did a great job. Thanks guys!
- Zoe - The Wild Oven
Turned up when they said they would. Quickly diagnosed the issue. Have used before and can't fault them.
- Pete English
Good service and quality of work
- Bill Baker
Excellent service, turned up on the day and on time, polite and professional team
- Mark Stevens
I was impressed not only by the speed and professionalism of the work done to install a new septic tank, but by the considerate friendliness of those who carried it out and of those conducting correspondence about the job.
- Robin Gilbert
From the telephonist to the operative, Cotswold Drainage was helpful, flexible, and professional in its work. It arrived on time and went out of its way to show excellent camera footage of the drains.
- Geoffrey
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    Have an emergency? Or looking for a maintenance or quote?

    What's the difference between sewage treatment plants and septic tanks?

    When it comes to wastewater management, many homeowners still rely on septic tanks. However, sewage treatment plants offer a more sophisticated and eco-friendly alternative. While septic tanks serve their purpose, they only partially treat wastewater, making it less ideal for modern environmental standards.

    Sewage treatment plants go beyond partially treating wastewater. They provide a comprehensive solution that thoroughly purifies water before releasing it back into the environment. Unlike septic tanks, which allow wastewater to disperse into the ground, treatment plants break down organic matter and remove harmful bacteria, significantly reducing pollution.

    Septic tanks

    Sewage treatment plants use a series of chambers and filters, ensuring that even the smallest impurities are removed. This advanced system not only safeguards your home's surroundings but also protects the local environment.

    In addition to being environmentally friendly, sewage treatment plants offer practical benefits. By effectively treating wastewater, they reduce the risk of ground and water pollution, ultimately leading to cleaner, safer properties.

    Sewage treatment plant

    We have an amazing team to help get your drains up and running smoothly.

    Our friendly, reliable, and expert team will always be on hand to provide you with the necessary drainage solutions. Working hard to get the job done as quickly as possible with the utmost efficiency and care, so that your life can get back to normal. There is nothing more important to us than keeping you in the loop, our engineers will keep you updated sending you reminders, and checking our visit will still be convenient to your needs.

    Cotswold Drainage Engineer

    How do sewage treatment plants work?

    First, wastewater flows into the primary settlement tank. Here, heavier solids settle at the bottom, forming sludge, while the lighter materials float to the top. This initial separation is crucial for preparing the water for further treatment stages.

    Next, the water moves into aeration chambers. In these chambers, air is introduced to encourage the growth of bacteria that break down organic matter. This biological process is highly effective at removing contaminants, ensuring the water is cleaner by the time it leaves this stage.

    Sewage treatment plant

    Following aeration, the water enters a secondary settlement tank. In this chamber, remaining solids settle out, leaving behind cleaner water. The slower flow rate in this tank allows even the smallest particles to be filtered out, adding an extra layer of purification.

    The final polishing stages involve removing any remaining impurities. Advanced filtration systems or chemical treatments may be employed to ensure the water meets stringent environmental standards. This meticulous process guarantees that the discharged water is safe and free of harmful pollutants.

    The entire treatment process, from initial settlement to final polishing, operates seamlessly to provide efficient and effective wastewater management. You can trust that a sewage treatment plant will safeguard the environment and protect your home’s surroundings.

    Sewage treatment plant

    Why choose Cotswold Drainage?

    Cotswold Drainage is CHAS-approved for health and safety, a member of Constructionline and has 25+ years of experience. You can trust us to maintain and unblock your drainage systems across commercial and domestic properties with minimal disruption, utilising the latest high-tech equipment as well as follow-up visits during and after your 6-month warranty.

    Why choose Cotswold Drainage for blocked drains?

    What we offer

    Here at Cotswold Drainage, our team have over 25 years’ experience and the expertise guaranteed to sort your problem quickly with minimum of fuss, leaving you more than satisfied.

    We offer a 6-month warranty, along with a free drain camera health check and a guarantee that you will receive follow-ups during and after your 6-month warranty.

    We operate a large fleet of vehicles, equipped with specialist equipment for any situation, including our high-power jetting system for removing blockages & cleaning, and also CCTV for on-site surveying of the problem or damaged drainage systems.

    Don’t just take our word for it, read our incredible reviews left by our valued customers

    Luke and his colleague were efficient, friendly and very professional. They arrived on time, kept me well informed and were just brilliant all round. I'd previously used a well known, national company and the contrast was remarkable. The previous company provided me with very little information, they refused to guarantee their work because a manhole was covered with a slab and once the blockage was cleared they left. Cotswold Drainage guaranteed their work and cleared the underlying problem, rather than the symptom. An all round excellent company to deal with.
    - L Lynass
    A great, straightforward service, thank you! Customer service is excellent - there was a problem with the date we originally booked, but it was quickly resolved by Richard, and he was very apologetic. The engineer who came out was Adrian. He was on time, called ahead of arrival as requested, and was very polite. Did a great job. Thanks guys!
    - Zoe - The Wild Oven
    Turned up when they said they would. Quickly diagnosed the issue. Have used before and can't fault them.
    - Pete English
    Good service and quality of work
    - Bill Baker
    Excellent service, turned up on the day and on time, polite and professional team
    - Mark Stevens
    I was impressed not only by the speed and professionalism of the work done to install a new septic tank, but by the considerate friendliness of those who carried it out and of those conducting correspondence about the job.
    - Robin Gilbert
    From the telephonist to the operative, Cotswold Drainage was helpful, flexible, and professional in its work. It arrived on time and went out of its way to show excellent camera footage of the drains.
    - Geoffrey
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