Who regulates septic tanks in Lincolnshire?
Lincolnshire 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 your district council (East Lindsey, West Lindsey, North Kesteven, South Kesteven, South Holland, Boston or Lincoln) or a registered building control approver. Read more in our England regulations guide.
Ground and soil conditions
The Lincolnshire Wolds are chalk, while the Fens and coastal marsh are flat silts and clays with high water tables, drained by a network of managed drains. A high water table can rule out a conventional drainage field or mean it has to be raised, and the timing of percolation tests matters in winter.
Protected waters and environmental checks
Much of the drained land is managed by Internal Drainage Boards. If you want to discharge treated effluent into an IDB drain, you'll normally need the Board's consent as well as meeting Environment Agency rules. The Wash is protected under several designations.
Local practicalities
Large farm holdings, isolated farm cottages and holiday parks near the coast mean a wide range of system sizes. Anything over 2 cubic metres a day to ground (or 5 to surface water) needs an environmental permit in England.
Towns and villages covered
Installers we work with cover Lincolnshire, including:
- Louth
- Horncastle
- Skegness
- Sleaford
- Spalding
- Market Rasen
- Grantham
- Bourne
- Alford
- Gainsborough
- Woodhall Spa
- Holbeach
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 Lincolnshire 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 · Devon · Cornwall · Cumbria · North Yorkshire · Northumberland · Shropshire · Herefordshire · Somerset · Dorset
Frequently asked questions
Do I need Internal Drainage Board consent?
If your treated effluent will discharge into a watercourse managed by an Internal Drainage Board, you'll normally need their consent too. Your installer should check which IDB covers your property.
Can a septic tank work in the Fens?
Sometimes, but high groundwater often makes a conventional drainage field unsuitable. A treatment plant discharging to a drain, with any IDB consent needed, or an engineered or raised system are common alternatives.
How much does septic tank replacement cost in Lincolnshire?
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 Lincolnshire can move your price either way, so compare site-visit quotes.