The bill establishes a presumption of compliance for entities covered under the state's industrial stormwater general permit, aiming to alleviate the burden of third-party litigation and enhance the safety of employees involved in stormwater management. It recognizes the unique challenges faced by regulated entities, particularly in marine transportation facilities, and emphasizes the need for a balanced approach that allows these entities to focus on environmental impact reduction rather than legal defenses. The legislation also highlights the importance of the Department of Ecology's adaptive management approach and the necessity of ensuring that compliance with water quality standards is achievable without compromising safety.

Key provisions include a presumption of compliance for permit holders who adhere to all permit conditions and implement approved best management practices. The bill outlines the process for permittees to notify the Department of Ecology in the event of a potential violation, allowing them to regain their presumption of compliance after taking corrective actions. Additionally, it stipulates that stormwater sampling at transportation facilities will not be required until safety concerns are addressed, ensuring that health and safety are prioritized in the implementation of the industrial stormwater general permit. The act is declared an emergency measure, taking effect immediately to support public health and safety.