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 in meeting water quality standards and emphasizes the importance of focusing resources on environmental impact reduction rather than legal defenses. The legislation outlines specific conditions under which compliance is presumed, including adherence to permit conditions and implementation of best management practices.

Additionally, the bill introduces provisions for stormwater sampling at transportation facilities, stipulating that such sampling is not required until it can be conducted safely. It mandates that the Department of Ecology must evaluate waiver applications based on health and safety considerations and ensures that sampling requirements are not enforced while a waiver is under consideration. The act is declared an emergency measure, taking effect immediately to support public health and safety.