Septicahttps://septica.co.uk/Independent guide to septic tanks, cesspits and sewage treatment plants in the UK: the general binding rules, real prices in pounds and what actually happens when you sell. We don't sell tanks.en-GB Septic tank smells: where the smell is tells you what is brokenhttps://septica.co.uk/septic-tank-smell/https://septica.co.uk/septic-tank-smell/Fri, 17 Jul 2026 12:00:00 GMTRotten eggs by the bath is a dried-out trap. Smell everywhere is a vent. Smell through an open window is a pipe that breaks the 900mm rule. Diagnose by location before you pay anyone. What not to put down a septic tank — and why British tanks don't need your bacteriahttps://septica.co.uk/what-not-to-flush-septic-tank/https://septica.co.uk/what-not-to-flush-septic-tank/Fri, 17 Jul 2026 12:00:00 GMTWipes, fats and bleach have official warnings behind them. Additives don't: a drainage company explains that in Britain's climate a septic tank works as a sedimentation tank, not a bio-digester — so there is no biology to optimise. Septic tank replacement: in some catchments the council pays the whole billhttps://septica.co.uk/septic-tank-replacement-cost/https://septica.co.uk/septic-tank-replacement-cost/Fri, 17 Jul 2026 12:00:00 GMTThere is no national grant. But councils in nutrient neutrality zones are offering free upgrades worth £13,000–30,000 — and almost nobody checks. Plus the real cost breakdown and the fine figure the trade repeats. What size septic tank do I need? Bedrooms give you the people, the regulation gives you the litreshttps://septica.co.uk/septic-tank-size/https://septica.co.uk/septic-tank-size/Fri, 17 Jul 2026 12:00:00 GMTTwo documents, one answer. British Water turns bedrooms into a population figure; Approved Document H turns that figure into litres. Here is the table nobody publishes, and why three 'rival' formulas are mostly the same rule. What a septic tank installation costs in the UK: quotes range from £1,600 to £18,000 and nobody official publishes a thinghttps://septica.co.uk/septic-tank-installation-cost/https://septica.co.uk/septic-tank-installation-cost/Fri, 17 Jul 2026 12:00:00 GMTThe tank is £800–1,200. The drainage field is £2,500–8,000. Every total on the internet comes from someone selling the job — and they disagree by eleven times. Here is the quote taken apart, line by line. Septic tank problems: the tank is almost never the thing that brokehttps://septica.co.uk/septic-tank-problems/https://septica.co.uk/septic-tank-problems/Fri, 17 Jul 2026 12:00:00 GMTWet patches, gurgling after rain, the bath filling first. What each symptom actually points to, why the water table is doing more damage than clay, and what a real diagnosis costs before anyone digs. Cesspit vs septic tank vs treatment plant: same price to install, ten times the difference to ownhttps://septica.co.uk/cesspit-vs-septic-tank/https://septica.co.uk/cesspit-vs-septic-tank/Fri, 17 Jul 2026 12:00:00 GMTA cesspit and a septic tank cost about the same to put in — £3,000–6,000 — and then one costs £150–400 a year and the other £1,500–3,500. The ground decides, not the budget. And cesspits are illegal in Scotland. Drainage field, not soakaway: the half of your septic system that actually treats the sewagehttps://septica.co.uk/soakaway/https://septica.co.uk/soakaway/Thu, 16 Jul 2026 12:00:00 GMTThe percolation test step by step from Approved Document H, the Vp band of 12–100, the formula At = p × Vp × 0.25, and why a rainwater soakaway is not a drainage field — and is not legal as one. Domestic sewage treatment plants: everyone beats the limit, so stop shopping on BODhttps://septica.co.uk/sewage-treatment-plant/https://septica.co.uk/sewage-treatment-plant/Thu, 16 Jul 2026 12:00:00 GMTManufacturers fight over effluent figures that are all three times better than the law requires, while their running-cost claims vary fivefold. What actually matters when you buy a treatment plant in the UK. Shared septic tanks: jointly liable for something you don't controlhttps://septica.co.uk/shared-septic-tank/https://septica.co.uk/shared-septic-tank/Thu, 16 Jul 2026 12:00:00 GMTIf a tank serves several homes, Citizens Advice says all the owners are jointly responsible. But no law makes your neighbour pay — and that gap is where shared tanks go wrong. The general binding rules, without the scare story: the 2020 deadline was withdrawn before it arrivedhttps://septica.co.uk/general-binding-rules/https://septica.co.uk/general-binding-rules/Thu, 16 Jul 2026 12:00:00 GMTThe Environment Agency deleted the 1 January 2020 deadline from its own guidance on 25 October 2019 — two months before it was due. What the rules actually require today, what happens when you sell, and why they only apply in England. How a septic tank works — and why the tank is the least important parthttps://septica.co.uk/how-a-septic-tank-works/https://septica.co.uk/how-a-septic-tank-works/Thu, 16 Jul 2026 12:00:00 GMTTwo chambers, a dip pipe and a gradient of 1 in 50. What the tank does, what it deliberately doesn't do, and why Approved Document H says it may only be used with a drainage field. What septic tank emptying really costs in the UK (2026): the only official price is in Northern Irelandhttps://septica.co.uk/septic-tank-emptying-cost/https://septica.co.uk/septic-tank-emptying-cost/Thu, 16 Jul 2026 12:00:00 GMTEngland publishes no price for emptying a septic tank — only a duty to do it once a year. Northern Ireland publishes £108, and gives you one empty free. Real tariffs, real quotes, and why the trade tells you to empty less often than the law does. Selling a house with a septic tank: your legal duty is to tell, not to replacehttps://septica.co.uk/selling-a-house-with-a-septic-tank/https://septica.co.uk/selling-a-house-with-a-septic-tank/Thu, 16 Jul 2026 12:00:00 GMTgov.uk asks you to inform the buyer in writing. It does not ask you to spend £10,000 first. What the rules actually require, what a survey finds, and how the negotiation really works. What a cesspit actually is (and why it costs six times more than a septic tank)https://septica.co.uk/cesspit/https://septica.co.uk/cesspit/Thu, 16 Jul 2026 12:00:00 GMTA cesspit treats nothing — it stores. The regulations demand 18,000 litres for two people, against 2,700 for a septic tank serving four. Here is the official rule, the real emptying bill, and when a cesspit is the only legal answer.