Foul Water & Sewage Drains

Foul water and sewage is the waste water from lavatories, baths, showers, sinks and basins as well as dish washers and washing machines. It requires suitable treatment before it is discharged back into the environment. Most properties are connected into the main public sewer and we pay an annual charge for the privilege of doing so by our local water authority. If however your property is located away from the main sewer there are a number of options available to legitimately discharge the foul water from your property. The design of these systems is dependent on a number of factors such as the availability of a suitable ditch or stream into which treated foul water can be discharged, the porosity and the area of land that may prove suitable for the construction of a drainage field, how accessible is the nearest public main sewer as well as the most economical solution. All of these factors will influence the design of a suitable system which will also require the consent of the Environment Agency before installation can take place.

Grosvenor Buildings and Landscape are experienced in the vast majority of foul water and sewage solutions. The Environment Agency apply a preferred hierarchy and this can be read into the following notes. In addition to the conventional works to connect into a main sewer (EA preferred option1), these include water treatment plants (fully treat the sewage so that the output is classified as clean water allowing discharge into an open water course or a suitable soak-away – EA preferred option 2), Septic tanks (partially treat the sewage so that the dirty water discharged will require further treatment – generally in a drainage field – EA preferred option 3) or a pumping station with which to pump raw sewage from a collecting tank to the main sewer which maybe inaccessible with a gravity system. A final option which can be specified where all else fails is the use of a Cess pit (EA final option where none of the above are suitable). This is a sealed tank into which all the foul waste is collected. The tank requires emptying regularly as it has no ‘overflow’ facility.

You may have come across the term ‘Grey’ water. This is a system whereby the waste water from bathing and washing is collected and re-used to flush the lavatories.

building services groundworks drainage foul water sewage drains sussex grosvenor