Hanford, CA Environmental Rules: Stormwater Management (2026)

The commencement, conduct or continuance of any illicit discharge to the storm drain system is prohibited except as described below:

A. Discharges from the following activities will not be considered a source of pollutants to the storm drain system and to waters of the U.S. when properly managed to ensure that potential pollutants are not present, and therefore they shall not be considered illicit discharges subject to this prohibition, unless specifically determined to cause a violation of the provisions of the Porter-Cologne Act, Clean Water Act, or this chapter: water line flushing; uncontaminated pumped groundwater and other discharges from potable water sources; landscape irrigation and lawn watering; irrigation water, stormwater runoff and return flows from agricultural lands; diverted stream flows; rising groundwater; groundwater infiltration to the storm drain system; foundation and footing drains; water from crawl space pumps; air conditioning condensation; springs; individual residential and occasional non-commercial car washing; flows from riparian habitats and wetlands; de-chlorinated swimming pool discharges; municipal and construction-related street wash waters; and flows from fire fighting.

B.