Establishing a presumption of compliance for entities covered under the state’s industrial stormwater general permit under certain circumstances.

HB 1937 creates a presumption that industrial stormwater permit holders comply with water quality standards when they follow all permit requirements - including proper implementation of approved pollution control practices - and notify the Department of Ecology within 30 days if site-specific data suggests a potential violation. It directly affects industrial facilities (like manufacturing plants and marine transportation sites) required to obtain stormwater permits under Washington’s regulations. Key provisions include requiring the Department to resume the presumption of compliance after corrective actions, addressing safety concerns for sampling at transportation facilities by delaying sampling until safety is confirmed, and reducing third-party litigation risks for permit holders who follow procedures. The bill aims to streamline compliance while prioritizing worker safety and resource efficiency for regulated entities.