Answer for What is the best environmental way to deal with water used to clean paint brushes?

Never pour the waste water down a street drain. The water won't receive any treatment before entering the local watershed. The best alternative is to pour the waste water down the toilet. This way the paint water will enter your local city waste water treatment plant.

The situation is different with a septic system. Dirty paint water is bad for a septic, both the tank and leach field. The only thing to do is pour the water on the land away from the well and septic system.

I'm not aware of any way to pre-treat this water.

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