Sewage Treatment System Options and Costs
Off-Mains Sewage Treatment Options
A Cesspool is an enormous, fully sealed underground wastewater holding tank having only an inlet and no outlet. A cesspool is designed to hold all sewage and wastewater effluent and does not carry out any treatment of the sewage whatsoever. It is also sometimes refered to as a Cesspit.
Many people also to refer to their septic tank as a "Cesspit". You MAY have a cesspool or it may be a septic tank. If it has an outlet, irrespective of the size of the tank, it is a septic tank, not a cesspool.
We always consider the options that are available to your site and we can give a report and quotation for the preferred system.
Septic Tank systems used to be the common method of treating sewage in rural areas. They are now only usually acceptable for small-scale developments up to 15 persons and are banned from use in large areas of the UK.
They consist of a holding tank which partly breaks down the solids by anaerobic bacteria before discharging the liquid effluent through the outlet pipe into a septic drainfield soakaway. Septic tank effluent contains 70% of the original pollutants that are in the raw sewage.
Unfortunately, the effluent they produce is very polluting and can ONLY be discharged into a septic drainage soakaway, if the ground conditions allow.
The septic drainage soakaway alone usually costs between £2000 and £5000 to construct. You cannot discharge to a watercourse from a septic tank, nor can you allow the effluent to leak into a watercourse as the fines are enormous.
Any septic tank that does discharged into a ditch or watercourse MUST be replaced by a sewage treatment plant by 1st January 2020, or before that date if the property is sold.
Sewage treatment plants have replaced septic tanks. They clean the wastewater to a high standard and the effluent can be discharged either to a soakaway, if the ground conditions are suitable, OR to a watercourse, as long as you conform with the General Binding Rules of the Environment Agency. The effluent is non-polluting if the plant is used and maintained correctly.
Typical installation costs are between £1500 and £8000, depending on the type of plant.
The lowest cost sewage treatment plant in the UK, both to install and run, is the VORTEX™ wastewater system from £1850 + VAT, including delivery to England and Wales.