A drain line connected to a holding tank, with periodic pumping. A drain line to a private wastewater treatment system that can treat wastewater to drinking water standards before discharging to groundwater. Treat and recycle or reuse the water within your shop. Close the drain, unless it is needed to comply with state or local laws. In your vehicle washing operation, collect wash water and rinse water in a holding tank, filter and reuse.
Clean water is only necessary for final rinse.
The less foreign materials in your wastewater, the easier it is to pretreat or treat. Pressure washers clean vehicle parts with hot water and detergent at high pressures. The wastewater generated by this process is not hazardous. Contact local wastewater authorities prior to purchase, to see if any local regulations restrict hot soap wastewater discharge to the sanitary sewer. Reduces solvent use.