Environment (Hazardous Materials)

This bill would allow Michigan farms to discharge certain types of wastewater, such as cooling or wash water from processing farm products, without needing a permit under specific conditions. The key requirements include limiting annual discharge to 100,000 gallons, prohibiting hazardous waste and surface water discharge, and ensuring the water is stored properly and applied to vegetated land at least 100 feet from property boundaries and 75 feet from water wells. Farms must also rotate discharge locations based on soil conditions and maintain records of each discharge, while the bill explicitly excludes discharges containing sanitary sewage unless applied through a permitted subsurface system.

SB 391 updates Michigan's environmental cleanup rules by establishing clearer standards for determining natural background levels of hazardous substances in soil. It defines "background concentration" as naturally occurring levels in soil, allowing property owners to demonstrate contamination is not due to human activity using specific soil surveys or studies. The bill directly affects developers, property owners, and environmental agencies involved in site cleanups by reducing unnecessary cleanup requirements when contamination matches natural background levels. Key provisions include adding new definitions (like "background concentration" and "baseline environmental assessment") and revising cleanup criteria to align with state soil surveys, making it easier to distinguish natural soil levels from pollution requiring remediation.