Septic tanks and sewage treatment plants can discharge effluent to ground via a drainage field, sometimes referred to as a soakaway.
How does a drainage field work?
A septic tank or package sewage treatment plant (PSTP) is designed to hold the solid wastes and let wastewater or effluent flow out of the tank into a drainage field. That drainage field then filters the water and allows bacteria to naturally break down any remaining solids in the water. So that by the time the water drains through the layers of earth in the drainage field, it is clean and safe to enter the environment.
Why do drainage fields fail?
Overtime the filter media in the drainage field gets silted up and prevents the bacteria from digesting the solids in the effluent and drainage into the ground. Eventually the sludge becomes septic, turns black and sometimes acts as a sponge soaking up the groundwater. When the effluent in the tank cannot drain or soakaway the effluent in the septic tank or package sewage treatment plant cannot exit the system and the drains will back up. If your drainage field or soakaway has failed or is longer effective then contact us at Tekneka to discuss your options on 07968 143756.
Drain field percolation tests
Contact us for advice on a new or failed drainage field / soakaway.
See page 31 – 33 of the approved document H – Drainage and Waste Disposal (2015 edition) offers guidance on building regulations that are relevant to drainage, septic tanks and sewage treatment plants.