Off mains? Find who can help, near you
Tank emptying, treatment plant servicing, drainage installers, heating oil and oil boiler engineers in Wiltshire and Somerset, each checked on its own website. Plus the rules, in plain English.
Septic tanks, treatment plants and cesspools: the rules, and who can help
Do I need to upgrade?
Septic tank, treatment plant or cesspool: answer a few questions and see which of the Environment Agency's rules apply, what has to change, and what to check with the Agency.
Check your systemBuying a home off mains
The questions to ask the seller about the drainage and a private water supply, what each answer means, and a checklist to print for viewings.
Read the buyer's pack
- Cesspools and cesspits Different rules from septic tanks: emptied regularly, no leaks or overflows.
- A smell from the tank What the rules say a smell means, and who to call.
Who can help, near you
155 firms we've checked on their own websites. Add your postcode to sort by distance, or pick the job. Not every firm in the area, and we say so. Emptying firms must be registered waste carriers: check any firm on the Environment Agency's public register.
These are the ones we've checked so far, each from its own website (checked 17/10/2026), not every one in the area. Missing one? Tell us.
How this list works
- Details you can check
- Services and waste carrier details link to the firm's own pages.
- Nobody pays to be first
- Firms can't buy their place in the list.
- Out of date? Tell us
- Firms can send corrections and we check them again.