Monterey Bay Area TMDL Listings - Priorities, Progress, and Documents

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This page on the Monterey Bay Area TMDL listings is intended to provide an overview of agency determinations for the various listed waterbodies in the Monterey Bay. This page was created by the ENVS 560/L Watershed Systems class at CSUMB.

See also: The 303d list of Impaired Waterbodies in the Monterey Bay Region

Monterey Bay Area Listings

See also: Summary of listing categories

Alamo Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Fecal Coliform, 5A 2002 2010: Agriculture, Grazing, Natural Sources [1] 2012: Source Unknown 7.8 Est. 2021 TBD

Alisal Slough[2]

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Low Dissolved Oxygen, 5A 2010 2010:Agriculture 2012: Source Unknown [3] 7.3 October 13, 2015 See Lower Salinas River TMDL
Nitrate, 5A 2010 2010:Agriculture 2012: Source Unknown 7.3 October 13, 2015 See Lower Salinas River Nutrient TMDL
Sediment Toxicity, 5A 2010 2012: Source Unknown 7.3 TBD Estimated 2013
Unknown Toxicity (Chlorpyrifos), 5A 2010 2012: Source Unknown 7.3 See Lower Salinas River Estimated 2025

Aptos Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Fecal Coliform, 5A 1990 Collection System Failure, Natural Sources, Onsite Wastewater Systems (Septic Tanks), Pasture Grazing-Riparian and/or Upland, Urban Runoff/Storm Sewers[4] 8.4 January 20, 2011 Fecal Coliform concentration shall not exceed - 200 MPN/100mL (w/ no less than 5 samples for any 30-day period) or 400 MPN/100mL (for no more than 10% of single samples collected during any 30-day period)[5]
Sedimentation/Siltation, 5A 1990 Channel erosion, land development 8.4 Estimated 2021 TBD

Moro Cojo Slough

Pollutant First Listed Possible Sources Assessed Area (acres) US EPA TMDL Approval Date TMDL
Ammonia (Unionized), 5A 2006 Agriculture, Boat Discharges, Grazing, Unknown 62 October 13, 2015[6] See Lower Salinas River
E. Coli 2010 Agriculture, Boat Discharges, Grazing, Natural Sources, Unknown 62 TBD Estimated 2021
Low Dissolved Oxygen 2002 Source Unknown 62 TBD Estimated 2021
Pesticides 2002 Agriculture, Grazing, Riparian Vegetation Removal, Unknown 62 Estimated 2021 No data since 2006
Sedimentation/Siltation 2002 Agriculture, Construction/Land Development, Nonpoint source 62 Estimated 2021 No data since 2006
Total Coliform 2010 Source Unknown 62 Estimated 2021 TBD
pH 2010 Agriculture, Boat Discharges, Grazing, Natural Sources, Removal of Riparian Vegetation, Unknown 62 Estimated 2021 TBD

Old Salinas River

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Chlorophyll-a 2010 Agriculture, Dredging, Other urban runoff, Removal of Riparian Vegetation 3.8 TBD TMDL needed, Also See Lower Salinas TMDL
Chlorpyrifos 2010 Agriculture, Other urban runoff 3.8 October 7, 2011 1-hour average of Chlorpyrifos must not exceed 0.025ppb more than once in a three year period, and 4-day average of Chlorpyriffos must not exceed 0.015ppb
Diazinon 2010 Agriculture, Other urban runoff 3.8 October 7, 2011 1-hour average of Diazinon must not exceed 0.16 ppb more than once in a three year period, and 4-day average of Chlorpyriffos must not exceed 0.10ppb
Fecal Coliform 2010 Agriculture, Marinas and Recreational boating, natural sources, other urban runoff 3.8 January 31, 2012 Shall not exceed an average of 200 MPN per 100mL, and 10% of samples collected may not exceed 400 MPN per 100mL based on a min of 5 samples in any 30-day period.[7]


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