PDFWAC 16-202-2007
How should rinsate from equipment or backflush water from a filtration device be handled?
(1) Water used to rinse, flush, or clean equipment or containers is considered rinsate. It must be applied onto a target site or disposed of properly.
(2) Contaminated backflush water from a filtration device cannot contaminate groundwater or surface water, or adversely impact sensitive areas.