Professional septic tank surveys, buyer reports and installations across Dorset. NADC-approved engineers based in Dorchester. 2020 General Binding Rules compliance guaranteed.
Drain-Age is Dorset's most established septic tank survey and installation company, based in Dorchester and serving the full county — from Weymouth and Wareham on the coast to Sherborne and Shaftesbury inland. With over 45 years of experience in private drainage, we are the contractor of choice for Dorset homeowners, solicitors, and rural estate agents.
Dorset's rural landscape means thousands of properties rely on private septic systems. Whether you're buying a farm in Blandford Forum, a cottage near Cerne Abbas, or a coastal property near Swanage, our NADC-approved engineers deliver thorough surveys and solicitor-ready reports within 48 hours.
With the 2020 UK General Binding Rules now fully enforced by the Environment Agency, non-compliant septic systems across Dorset face enforcement action. Our compliance surveys protect you, your investment, and the Dorset environment.
Solicitor-approved pre-purchase reports for rural property buyers.
Learn MoreFull compliance certification against the 2020 UK General Binding Rules.
Learn MoreFAQs

Coverage Area
Based in Dorchester, our engineers cover the full Dorset area and beyond — including all rural and off-mains properties.
NADC-approved septic tank surveys and reports across Dorset. Call our Dorchester team today for fast attendance and 48-hour report turnaround.