Urban runoff discharged from municipal storm drain systems is one of the principal causes of water quality impacts in most urban areas. It can contain pollutants such as trash and debris, bacteria and viruses, oil and grease, sediments, nutrients, metals, and toxic chemicals that can negatively affect the ocean, rivers, plant and animal life, and public health.
The City of LA's LID ordinance became effective in May 2012. The main purpose of this law is to ensure that development and redevelopment projects mitigate runoff in a manner that captures rainwater at its source while utilizing natural resources. Project applicants are required to prepare and implement a stormwater mitigation plan when their projects fall into any of these categories:
* Developments of less than 5,000 square feet in these categories are only subject to the prescriptive method described in the City of Los Angeles Best Management Practices Handbook Part B, 3rd Edition.
Project applicants will be required to incorporate stormwater mitigation measures into their design plans and submit the plans to the City for review and approval. Plan check appointments are available at two locations:
Any project that cannot comply with the Low Impact Development Ordinance requirements shall be required to comply with, at a minimum, all applicable Standard Urban Stormwater Mitigation Plan requirements in order to maximize onsite compliance. For questions related to projects required to comply with the Low Impact Development ordinance, please call 213-482-7066 or visit the LA Stormwater Public Counter at 201 North Figueroa Blvd, Third Floor, Station 18, Los Angeles, CA 90012.