Sewage Treatment Plant Repairs and Maintenance

Sewage treatment plants are used to treat wastewater in environments where access to mains drainage is not possible, making the water suitable for discharge into a watercourse or drainage field.

Unlike a cesspit or septic tank, a sewage treatment plant treats the sewage inside to a safe level, eliminating the risk of potential diseases being discharged in the effluent.

When a sewage treatment plant fails, it can have devastating effects, with essential facilities like toilets becoming unusable as well as potentially dangerous gases being released from the unit.

At Mawdsleys Pump Services, we provide a complete installation, repair and maintenance service for sewage treatment plants and can provide on-site fixes for common faults.

Common Faults With Sewage Treatment Plants

Our highly trained sewage treatment plant engineers can help with the most common problems including:

  • Too much effluent, plant needs emptying
  • Blower not turning on or not pumping air
  • Pump failure or underperformance
  • Bad smells coming from the unit
  • Sewage treatment plant has gone septic
  • Pump alarm is sounding
  • Toilet facilities are no longer working properly
  • Problems with the soakaway
  • Compressor motor failure or underperformance
  • Treated effluent not meeting targets

To prevent common faults from developing, it is highly recommended that you have your sewage treatment plant services by an expert on an annual basis or if you note any of the above faults.

If you have an emergency problem with your sewage treatment plant, don’t hesitate – call Mawdsleys today on 0117 954 8030, we offer a 24/7 emergency pump repair service and can fix most problems on site.

Discharge Consent for Sewage Treatment Plants

If you have a sewage treatment plant, you will need to get discharge consent before releasing sewage. Mawdsleys Pump Services can assist with discharge water testing and acquiring discharge consent for your unit.

To ensure that the effluent being discharged by your sewage treatment plant does not harm the environment or pose a health risk, it must not exceed enforced limits of elements such as suspended solids or ammonia.

To ensure your plant meets the required standards, Mawdsleys can carry out water testing which highlights any elements found in your plant’s effluent that are above the maximum limits.

Expert Advice and Knowledge

When we first receive an enquiry regarding a new installation, service or repair, one of our technical specialists will contact you to discuss your requirements, expectations and provide a system or solution which is suitable for your needs and budget.

From here, we can recommend the system that’s right for you, taking into account the running costs, tanker charges, frequency of tanker visits etc.

Rest assured that all recommendations we make will be in line with best practices, upcoming legislation, and your individual requirements.

Nationwide Commercial and Domestic Sewage Treatment Plant Service

Mawdsleys Pumps has years of experience in the design, installation, ongoing maintenance and emergency repair of septic tanks and sewage treatment plants, our core services include:

  • Bespoke Design and Installation
  • Service Plans to allow smooth operation
  • Nationwide 24-Hour Breakdown Attendance 365 days per year
  • Upgrade of Equipment to meet Guidelines
  • Telemetry Units and Full Monitoring Systems
  • Pump Equipment Repair or Replacement Service
  • Compressor Motor Rewind and Replacement

We are familiar with all leading makes and models of sewage treatment plant from leading manufacturers and our sewage treatment plants range from homes and businesses right through to industrial sites and large leisure and retail parks.

Methods of Sewage Treatment and Disposal

There are 3 common methods of sewage treatment and disposal: septic tanks, cesspits/cesspools and sewage treatment plants. Whilst all have their own drawbacks and benefits, sewage treatment plants are now the recommended systems for disposing of waste when not running on a mains water system:

Advantages Disadvantages
Cesspit / Cesspool

Cesspits are sealed underground tanks designed to simply store waste, no treatment occurs and the tank has no outlet meaning it must be emptied by a licenced professional.

·         Lower installation costs.


·         Sewage inside is not treated.

·         Must be emptied when full.

·         Can cause pollution if damaged.

·         Difficult to sell a property that relies on cesspit system.

Septic Tanks

Septic tanks store and partially break down organic waste, making the effluent suitable for discharge in some areas.

·         Lower installation costs. ·         Must be emptied on an annual basis.

·         Causes pollution and can harm wildlife as effluent is not 100% clean.

Sewage Treatment Plants

Sewage treatment plants use microbial technologies to break down organic waste, making it safe for discharge. There are many different types of sewage treatment plants available to suit all requirements.

·         Treats sewage inside to a safe level.

·         Eliminates the risk of potential diseases being discharged in the effluent.


·         Requires regular servicing and emptying.

Domestic Sewage Treatment Plant

Read our detailed blog post to find out more about the dangers of septic tanks and cesspits.

Sewage Treatment Plant Maintenance 

Sewage treatment plants are a large investment for home and business owners, so proper maintenance is essential. Regular maintenance helps to ensure your plant is running as efficiently as possible, whilst also enabling the engineer to fix any developing faults before they become serious problems.

Sewage Treatment Plant FAQs

  • Can I install my own sewage treatment plant?

Whilst it is possible to install your own sewage treatment plant, we would highly recommend that you do not attempt this without the right knowledge and equipment.

  • How much does a sewage treatment plant costs?

In domestic premises, costs start from £2000+ VAT  subject to size of treatment plant. The installation price is subject to a site survey.

  • How does a sewage treatment plant work? 

Sewage treatment plants break down solid waste to convert wastewater into a cleaner and more environmentally friendly substance.

Using internal biozone chambers and a pump that airs the waste received, sewage treatment plants encourage the growth of friendly microbial organisms which break down and purify the organic waste.

Sewage treatment installation maintenance and repair
  • Do sewage treatment plants need planning permission? 

When installing a sewage treatment plant, you must have building regulations approval and you may also need planning permission.

  • How often should a sewage treatment plant be serviced? 

To ensure that your plant performs efficiently and is not at risk of breaking down, it is recommended to have a service performed by a professional pump engineer on an annual basis.

  • What are the general binding rules?

The general binding rules are a set of rules that govern small sewage discharges from septic tanks or sewage treatment plants in England. The rules include limits of the amount of water that can be discharged as well as the quality of the water and where the water is discharged.

If you own the property that uses the sewage treatment plant then you are classed as the ‘operator’ of the plant and must meet these rules or apply for a permit if you do not.

Download the full general binding rules for sewage discharges (SSDs).

Sewage Treatment Plant Experts

At Mawdsleys Pumps, we’ve been working with all types of pumping systems including sewage treatment plants for many years.

For more information, call one of the team now 0117 954 8030 or fill out a contact form and we’ll get back to you.