Why do I need a Sewage Treatment Plant?
As of January 2020, septic tanks that discharge effluent directly to watercourses have to be replaced by Sewage Treatment Plants. Anyone who already owns a septic tank for their property must upgrade or replace their septic tank with a fully compliant sewage treatment plant.
A septic tank, by itself, is simply a settlement tank which holds waste water and sewage, and is fitted and used by properties, often situated in rural locations, which cannot connect to the mains sewer. Where septic tanks correctly discharge to a drainage field, it is the drainfield which filters and treats the septic fluid. As the effluent is not treated in instances where the septic tank discharges into the watercourse, the Environment Agency have changed the ruling so that septic tanks must either discharge to a drainage field that meets British Standards or be replaced by a Sewage Treatment Plant.
A drainage field for a septic tank has to be of a certain size to accommodate the waste discharge. Some homeowners may struggle if their land is populated by trees or not substantially large enough to cater for a drainfield. The advantage of having a septic tank replaced by a Sewage Treatment Plant is that the drainage field size is often 20% less than that required of a septic tank’s drainage field.