Environmental Monitoring Division

About the Division

The Environmental Monitoring Division of OC Watersheds is responsible for a wide array of programs designed to assess the status of the surface water environment in Orange County. The Division is comprised of the following two Sections:  

Environmental Data Management Section

The Environmental Data Management Section manages environmental monitoring, hydrologic, and Geographical Information System (GIS) data and provides Orange County rainfall information for the latest as well as historic storm events. This unit also manages a network of rainfall and stream gage stations located throughout Orange County which comprise the Automated Local Evaluation in Real Time (ALERT) system. Please visit the OC Environmental Resources GIS/Data Portal for access to a number of interactive maps and GIS data:


Monitoring Programs Section

This Section is responsible for implementing environmental monitoring programs required by the areawide municipal stormwater permits issued to the County and cities of Orange County by the Santa Ana and San Diego Regional Water Boards, otherwise known as "municipal separate storm sewer system" or "MS4" permits. This unit also supports monitoring required by Total Maximum Daily Loads (TMDLs), the development and implementation of special monitoring studies, and participation in regional monitoring efforts such as the Stormwater Monitoring Coalition (SMC) and the Southern California Bight program.