WA HB1937

Establishes a presumption of compliance with water quality standards for industrial stormwater general permit holders who fully comply with all permit conditions and implement approved best management practices for pollution control

Allows permittees to regain compliance presumption by notifying the Department of Ecology in writing within 30 days of becoming aware that a discharge may have caused or contributed to a water quality violation

Exempts transportation facilities from stormwater sampling requirements until the department determines sampling can be conducted without endangering worker health and safety

Suspends sampling requirements while any waiver application is under department consideration or appeal

Declared an emergency measure taking effect immediately, intended to protect regulated entities from third-party litigation while they implement corrective actions under department oversight