Reducing Priority Pollutants

Rosemarie Gaglione, Director, Public Works

When a specific creek or bay is impaired by a priority pollutant and doesn't meet State Water Resources Control Board (SWRCB) and EPA water quality standards, that water body can be assigned additional requirements that need to be met to limit the amount of the pollutant. These requirements are called Total Maximum Daily Loads (TMDLs) and there TMDLs for pathogens, pesticides, and sediment in Marin.

The SWRCB can similarly add an amendment with new requirements directly to all municipal stormwater permits for a priority pollutant  that impacts water quality statewide. They are currently in the process of doing this for trash.

Special protections are also assigned for coastal State designated Areas of Special Biological Significance (ASBS). The tidal shoreline off the Bolinas Mesa is home to the Duxbury Reef ASBS which is recognized for it's particular biological communities, that because of their value and fragility, need special protections to preserve and maintain natural water quality conditions from all pollutants.

MCSTOPPP assists Marin's 11 municipalities and the county in developing and implementing plans and programs to address all of these pollutant issues.

various pets

Reducing pathogen loading from urban areas and horse facilities.


Reducing pesticide loading from residential and commercial use.

erosion and sediment control

Reducing sediment loading from construction, landscaping, rural roads, and open space

Trash along gutter

Trash Requirements
Implementation plans
Volunteer efforts