*This program has been canceled.*Come along for the fun, we’re going on a paleo run! Don’t be late, it won’t be drab – we’re going to look for shells and crab!Join us for a guided tour of the Clark…

A number of documents are available on these pages that describe the regulations and programs aimed at preventing and controlling the discharge of pollutants to the municipal stormdrain system and…

County of Orange BMP Design ManualThe County of Orange (County) is subject to two Municipal Separate Storm Sewer System (MS4) permits issued by the Santa Ana and San Diego Regional Water Quality…

As a result of the Third Term NPDES Municipal Stormwater Permits for Orange County, adopted by the Santa Ana and San Diego Regional Water Quality Control Boards in early 2002, the cities and County (…

The Santa Ana Region Monitoring Plan fulfills the requirements of Phase I MS4 Permit issued by the Santa Ana RWQCB. Maps of the Santa Ana Region monitoring sites is provided in the link below: …

OC Environmental Resources oversees a wide array of programs designed to assess the condition of the surface water environment in Orange County. The OC Monitoring and Data Assessment division manages…

While the 2007 Drainage Area Management Plan (DAMP) provides a foundation for the Orange County Stormwater Permittees to implement model programs designed to prevent pollutants from entering…

The County and cities of south Orange County are subject to a municipal separate storm sewer system permit (MS4 Permit) issued by the San Diego Regional Water Board (Water Board) which regulates…

Below is the Stormwater Program Effectiveness Assessment (PEA) for the County of Orange/Orange County Flood Control District (County), for the 2016-17 reporting period (July 1, 2016 - June 30,…

Please visit northocirwm.org for the most up-to-date information on Integrated Regional Water Management (IRWM) efforts in North and Central Orange County. Efforts to develop a combined …