to the Orange County Nitrogen and Selenium Management Program (NSMP) web
site. The NSMP is a five-year work effort to comply with the requirements
of a NPDES permit (Order No. R8-2004-0021)
issued by the Santa Ana Regional Water Quality Control Board for the Newport
Bay watershed in central Orange County, California. Since studies have found
that ambient groundwater concentrations in the watershed frequently exceed
numeric limits for selenium set in the permit, and because the feasibility
of currently established technologies for reducing selenium in short-term
groundwater discharges has not been proven, the NSMP will provide focused
study to better understand selenium impacts and potential treatment methods.
Nitrogen issues will also be addressed to support re-evaluation of the existing
The NSMP is being conducted in accordance with milestones set in Order No. R8-2004-0021 by the NSMP Working Group. The NSMP Working Group consists of staff level technical representatives of watershed stakeholders that include state, county, and city agencies, water districts, and private entities that have agreed to fund and implement a work plan to address selenium and nitrogen groundwater-related inflows in the Newport Bay watershed.
Orange County Vicinity Map