Laguna Niguel, CA Environmental Rules: Stormwater Management (2026)

Article 5 of Title 6, Chapter 3 of the Laguna Niguel Municipal Code, the 'Runoff Water Quality Control Ordinance' (Secs. 6-3-400 through 6-3-410), carries out the city's obligations as a co-permittee under the San Diego Regional Water Quality Control Board's NPDES permit. Section 6-3-404 is the operative ban: no person may construct, maintain, operate or utilize an illicit connection to the stormwater drainage system, cause or allow a prohibited discharge, or direct an agent, employee or contractor to do either. A pre-existing 'legal nonconforming connection' does not become illicit right away; structural connections get five years from the article's 2010 adoption before the ban applies, and nonstructural ones get six months after the owner receives written notice, under Section 6-3-404(b).

A city 'authorized inspector', the director of public works/city engineer or the director of community development, enforces the article and, per Section 6-3-406, may enter private property to trace a discharge after obtaining consent or a warrant. Section 6-3-405(c) separately bars discarding household rubbish or garbage on any street, sidewalk, alley or point of entry to the storm drain system, and property owners who let prohibited dumping continue can be cited for maintaining a nuisance. Enforcement under Section 6-3-407 runs from a notice of noncompliance through administrative compliance orders, cease-and-desist orders and cost recovery, with a right to an administrative hearing before the city's hearing officer within 45 business days of a timely appeal.