Sewage treatment works

Bellozanne Sewage Treatment Works

The Sewage Treatment Works (STW) uses biological treatment and ultra-violet disinfection to clean the water, which is then discharged into St Aubin’s Bay.​

The previous STW at Bellozanne had been in operation for over 50 years, but it had reached the end of its functional life. It was:

• inefficient
• costly to maintain
• provided inconsistent treatment
  
• couldn't be expanded to accommodate future population growth
• struggled with odour control

The new facility has been fully operational since December 2023.

​Treatment of sludge

We pasteurise the sewage sludge which is then anaerobically digested to remove harmful pathogens that can cause disease, including:

• bacteria
• viruses
• other microorganisms
  

We thicken the resulting treated biosolids which are recycled as fertilizer.

Recycling of waste water at Bellozanne Sewage Treatment Works diagram

Tanker discharge

Tankers can come to the STW at Bellozanne to discharge their load.

What happens to your sewage

When you flush a toilet or empty a sink it goes to the sewage treatment works (STW).

We have 107 pumping stations keeping the sewage flowing in the right direction.

Our sewage treatment works provides:

• primary settlement
• biological treatment by the activated sludge process
• ultra-violet disinfection

The cleaned water is then discharged into St Aubin's Bay.

We must follow strict EU standards for discharge into bathing waters. These standards are set out in the discharge certificate issued by the Department of the Environment.

We have computer systems monitoring the STW and pumping stations. If there's a problem our operator's mobile phone will receive an alarm. Our operators are on call day and night to fix any problems straight away.

What you can or can't flush

You should only flush pee, poo and paper down your toilet.

Other materials can cause blockages and problems to Jersey's sewer system. This can lead to serious problems including the flooding of your home.

Don't flush

You can help prevent blockages and overloads in the sewer system or avoid problems with your property drainage.

You should never flush or pour down the toilet, sink or sewer:

• hygienic or sanitary products (including nappies, cotton buds, cosmetic wipes and wet wipes)
• paper hand towels or cleaning cloths
• cooking oil
• waste paints
• garden chemicals or excess household chemicals
• excess detergents
• empty swimming pool or pond water (to do this contact Transport and Technical Services)
• surface water from roof down pipes, patios, driveways or other areas of hard standing

Use our A to Z recycling finder to find where you can recycle or dispose of your waste.