General Information

New Treatment Processes

Regional San’s 2010 discharge permit contains strict mandates that require us to construct costly new “tertiary” treatment processes for ammonia and nitrate removal, filtration and enhanced disinfection:

Ammonia and nitrate removal: Using a process called “biological nutrient removal” (BNR), this will eliminate nearly all ammonia and most nitrate from the effluent (treated water), addressing concerns about possible impacts these constituents may have on the ecosystem, both here and downstream.

Filtration and enhanced disinfection: Filtration will be added to remove smaller particles and more pathogens from the effluent (as compared with the existing treatment process). Additional disinfection will also be implemented to inactivate pathogens that may remain even after treatment.

New Biological Nutrient Removal facilities (foreground) are being built next to the existing treatment plant [artist rendering]