White Papers

Navigating The Complexities of Stormwater Regulation in California

Four Best-Practice Approaches for Addressing MS4 Requirements for Smaller Municipalities

In this whitepaper, Harris' Director Frank Lopez, PE, QSD, CFM, provides not one, but four best-practice approaches for addressing the California State Water Resources Control Board's regulations around the municipal separate storm sewer systems (MS4) low-impact development requirements.

Under the updated mandates, more green space must be incorporated to treat water at the lot level. Municipalities must ensure that developers satisfy the requirements of the low-impact development (LID) approach. Those affected will face challenges, since the regulation employs broad language forcing municipalities to interpret the requirements whenever location-specific issues arise, which is quite often.


Frank Lopez, PE, QSD, CFM

Frank Lopez, PE, QSD, CFM

Senior Director / Engineering Services



Frank Lopez, PE, QSD, CFM




Construction Management
Municipal Engineering