A commercial garage is a vehicle repair, servicing or MOT business handling cars, vans or larger vehicles. Across Greater London, commercial garages are common on industrial estates and side streets in every borough. Drainage characteristics include workshop floor gullies connected through a forecourt oil interceptor (also known as a petrol interceptor) before discharge to the surface water sewer, plus separate WC drainage to the foul system. Common issues include oil-saturated interceptors requiring tanker emptying, blockages from rags and absorbents flushed inappropriately, and contamination of surface water if the interceptor fails. Trade effluent consent from Thames Water may be required for any process water discharged to the foul sewer. Operators should arrange routine interceptor servicing, maintain spill kits on site and hold environmental permits where required for hazardous substances.
Commercial garage
Vehicle repair or MOT garage with oil interceptor and trade effluent requirements.
