Who regulates septic tanks in Cumbria?
Cumbria is in England, so private sewage discharges are regulated by the Environment Agency. In England, small sewage discharges (up to 2 m³ a day to ground, or 5 m³ a day to surface water) don't need a permit if they meet the general binding rules. Under those rules, septic tanks must not discharge to surface water such as a ditch or stream, systems must meet the relevant British Standard and be sized correctly, and new discharges can't be in or within 50 metres of protected sites or in Source Protection Zone 1. Any new septic tank or treatment plant needs building regulations approval.
Building approval for a new or replacement system comes from Cumberland Council or Westmorland and Furness Council building control, or a registered building control approver. Read more in our England regulations guide.
Ground and soil conditions
The Lake District fells are hard volcanic rock and slate with thin soils and some of the highest rainfall in England. The Eden Valley and the Solway Plain have clay-rich glacial till. Both can make a conventional drainage field difficult, so treatment plants and engineered designs are common.
Protected waters and environmental checks
The River Eden and River Kent are Special Areas of Conservation, and lakes such as Windermere and Bassenthwaite are sensitive to phosphorus. Nutrient neutrality has affected planning in parts of Cumbria. New discharges near protected sites need an Environment Agency permit.
Local practicalities
Fell farms, holiday cottages and remote properties with long tracks are common, and access for tankers and diggers can be the deciding factor in cost. The Lake District and Yorkshire Dales National Park Authorities handle planning inside the parks.
Towns and villages covered
Installers we work with cover Cumbria, including:
- Penrith
- Kendal
- Keswick
- Cockermouth
- Appleby-in-Westmorland
- Ulverston
- Wigton
- Brampton
- Kirkby Stephen
- Ambleside
- Sedbergh
- Alston
The list isn't exhaustive. Enter your postcode and we'll find installers who cover your property.
What it typically costs
The figures below are national guide prices from installers' published guides and merchants' list prices, because there's no reliable published data for Cumbria on its own. Expect your quote to reflect the local ground, access and discharge route described above.
- Like-for-like septic tank replacement: roughly £3,000–£7,000
- New septic tank with drainage field: from about £5,500; commonly £5,000–£15,000
- New drainage field: £3,000–£7,000
- Sewage treatment plant unit only: about £2,190–£2,700 inc VAT (equipment only)
- Sewage treatment plant, supplied and installed: commonly £7,500–£15,000
- Emptying: priced by volume. One private tanker firm charges £170 for up to 1,000 gallons and £380 for up to 4,000 gallons
Other areas in England
Norfolk · Suffolk · Lincolnshire · Devon · Cornwall · North Yorkshire · Northumberland · Shropshire · Herefordshire · Somerset · Dorset
Frequently asked questions
Is a treatment plant needed near Windermere?
It depends on the site, but near sensitive lakes the higher treatment of a small sewage treatment plant, and sometimes a permit with phosphorus limits, is often required. Speak to the Environment Agency or your installer early.
Who handles building control in Cumbria now?
Since April 2023 Cumbria has two unitary councils, Cumberland and Westmorland and Furness. Building control is with whichever one covers your property, or you can use a registered building control approver.
How much does septic tank replacement cost in Cumbria?
We don't publish made-up local prices. Installers' published guides put a like-for-like replacement at roughly £3,000–£7,000, a new tank with a drainage field at commonly £5,000–£15,000, and a treatment plant at commonly £7,500–£15,000 fitted. Ground and access in Cumbria can move your price either way, so compare site-visit quotes.