Septic Tanks & Water Treatment Plants

Choosing between a septic tank and a treatment plant depends on property use, planning requirements and the sensitivity of local waterways. Septic tanks are simple but require careful emptying and drainage field health.

Treatment plants need electricity, provide cleaner effluent, and are often needed for sites near streams, such as in West Bexington or Evershot. Both systems need regular servicing to operate efficiently and to meet Dorset's environmental standards.

Routine emptying is essential for septic tanks, whether serving a cottage in Puncknowle or a farmhouse near Bridport. Solids must be removed before levels build up and cause blockages or overflows.

Our tanker team works cleanly and efficiently, minimising disruption to gardens or driveways. Regular maintenance checks look for signs of leaks, filter blockages or issues in the connected soakaway.

Treatment plants must be serviced regularly to keep air pumps, motors and biological units working well. Missed servicing can lead to system failure and discharge issues, especially in sensitive rural sites.

Our team conducts mechanical servicing, emptying, and effluent checks as required by manufacturers. Servicing reports are provided for your records or to meet local authority requests.

Backed up drains or overflowing tanks can quickly create health hazards. Our emergency team is available all year for urgent pump-outs, blockage clearance or quick repairs in places like Abbotsbury or Poundbury.

You can call us day or night—our target is to reach you within an hour for emergencies, including at agricultural or hospitality sites.

A sewage treatment plant provides a more advanced solution for properties without mains drainage, treating wastewater to a higher standard than a septic tank. The plant uses mechanical and biological processes to break down and purify household sewage.

These systems are frequently installed in places such as Winfrith Newburgh or Puddletown where new builds or updates to older drainage are required. Treated water can be safely discharged, subject to environmental regulations.

Installation begins with a ground assessment to ensure suitable location and soil conditions, as is common in Winterborne St Martin and surrounding Dorset villages. Excavation is carried out, the chamber placed and all pipework connected.

Dorchester Drains arranges installation for new builds, barn conversions, and replacement of old tanks. All works comply with UK building regulations, and clients receive clear handover guidance for ongoing care.

Cracks, leaking joints or collapsed baffles can affect septic tank performance. Common signs of trouble include foul smells, slow drainage or pools of water above the tank area.

Dorchester Drains provides written repair guarantees. Engineered solutions may include relining, patching or, when needed, digging out failed sections. We tackle both urgent faults and planned upgrades.

Environmental rules set out by the Environment Agency govern the installation and operation of septic tanks and treatment plants in Dorset. Discharge must not pollute streams, rivers or groundwater.

Dorchester Drains ensures all new installations and upgrades comply with regulations. Advice is provided on permits, inspections and changes needed for older tanks, helping clients avoid unintentional breaches.

Problems in the drainage field or soakaway lead to saturated lawns, pooling or slow draining facilities. Inspection includes digging trial holes, CCTV surveys and flow tests to locate issues.

Repair options range from jetting and clearance to full field renewal. Our engineers work with local ground conditions in Dorset, and always advise on maintenance to extend the life of your system.