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

Pajaro River Watershed

Impaired water bodies listed downstream to upstream & north to south.

Watsonville Slough

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Low Dissolved Oxygen 2010 Agriculture, Removal of Riparian vegetation, Urban runoff/storm sewers 6.2 Estimated: 2021 TBD
Pathogens 1996 Agriculture, Collection system failure, Grazing, Landfills, Natural sources, Pasture grazing-riparian and/or upland, Urban runoff/storm sewers 6.2 July 19, 2007 Based on a minimum of no less than 5 samples: Fecal coliform shall not exceed a log mean of 200MPN/100mL, and 10% of total samples must not exceed 400MPN/100mL [1]
Pesticides 1996 Agriculture, Agriculture-irrigation tailwater, Agriculture storm runoff, Irrigated crop production, nonpoint source 6.2 Estimated: 2021 TBD
Turbidity 2010 Agriculture, Removal of riparian vegetation, Urban runoff/storm sewers Estimated: 2021 TBD

Beach Road Ditch

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Low Dissolved Oxygen 2010 Agriculture, Removal of Riparian vegetation 0.78 Estimated: 2021 TBD
Nitrate 2010 Agriculture, Removal of Riparian vegetation 0.78 Estimated: 2021 TBD
Turbidity 2010 Agriculture, Removal of Riparian vegetation 0.78 Estimated: 2021 TBD
pH 2010 Agriculture 0.78 Estimated: 2021 TBD

Pajaro River

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Boron 2006 Agriculture, Other urban runoff, Saltwater intrustion, Source unknown 32 Estimated: 2021 TBD
Chlordane 2010 Source unknown 32 Estimated: 2021 TBD
Chloride 2010 Agriculture, Natural sources, Other urban runoff, Saltwater intrusion 32 Estimated: 2021 TBD
Chlorpyrifos 2010 Agriculture, other urban runoff 32 November 12, 2013 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 [2]
DDD (Dichlorodiphenyldichloroethane) 2010 Source unknown 32 Estimated: 2013 TBD
Dieldrin 2010 Source Unknown 32 Estimated 2021 TBD
Escherichia coli (E. Coli) 2010 Collection system failure, natural sources, onsite wastewater systems, pasture grazing-riparian and/or upland, transient encampments, urban runoff/storm sewers 32 August 3, 2010 Must not exceed 235 MPN/100mL [3]
Fecal Coliform 2002 Collection system failure, natural sources, onsite wastewater systems, pasture grazing-riparian and/or upland, transient encampments, urban runoff/storm sewers 32 August 3, 2010 Must not exceed 400 MPN/100mL [3]
Low Dissolved Oxygen 2010 Agriculture, Grazing-related sources, Other urban runoff, Removal of riparian vegetation, Unknown nonpoint source 32 Estimated: 2021 TBD
Nitrate 2006 Agriculture, Urban runoff/Storm sewers 32 October 13, 2006 Nitrate must not exceed 10 mg/L and 30-day mean must not exceed 5mg/L [4]
Nutrients 1996 Agriculture Return flows, agriculture, agriculture-irrigation tailwater, agriculture storm runoff, agriculture subsurface drainage, channelization, irrigated crop production, nonpoint source, removal of riparina vegetation, urban runoff/storm sewers, wastewater - land disposal 32 July 30, 2015 Dry Season: Nitrate < 1.8 to 3.9 mg/L, Total N < 1.1 mg/L to 2.1 mg/L, Orthophosphate < 0.4 to 0.14 mg/L Wet Season: Nitrate < 8 mg/L, Orthophosphate < 0.3 mg/L Year Round: Nitrate < 10 mg/L [5]
PCBs (Polychlorinated biphenyls) 2010 Source unknown 32 Estimated: 2021 TBD
Sediment/Siltation 1996 Agriculture, Grazing related sources, Highway/road/bridge runoff, Silviculture, Streambank modification/destabilization, Surface mining, Urban runoff/storm sewers 32 May 3, 2007 See Pajaro River Sediment Project report Figure 4.4, Page 20
Sodium 2010 Agriculture, Natural sources, Other urban runoff, Saltwater intrusion, Unknown nonpoint source 32 Estimated: 2021 TBD
Turbidity 2010 Agriculture, Grazing, Other urban runoff, Removal of riparian vegetation 32 Estimated: 2021 TBD
pH 2010 Unknown 32 Estimated: 2021 TBD

Bolsa Neuva Watershed

Impaired water bodies listed downstream to upstream, North to south

Moss Landing Harbor

Pollutant First Listed Possible Sources Assessed Area (acres) US EPA TMDL Approval Date TMDL
Chlorpyrifos 2010 Agriculture, Grazing Related Sources, Other urban runoff 79 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[6]
Diazinon 2010 Agriculture 79 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 [6]
Low Dissolved Oxygen 2010 Source unknown 79 October 13, 2015 See Lower Salinas River Nutrient TMDL
Nickel 2010 Agriculture, Dredging, Marinas and Recreational boating, Natural sources, Other urban runoff, Unknown sources 79 Estimated: 2021 TBD
Pathogens 1992 Agriculture, Boat discharges/vessel wastes, nonpoint source 79 Estimated: 2021 TBD
Pesticides 1992 Agriculture, Irrigated and specialty crop production 79 Estimated: 2021 TBD
Sediment Toxicity 2010 Agriculture, Boatyards, Dredging, Grazing related sources, marinas and recreational boating, Other urban runoff 79 Estimated: 2021 TBD
Sedimentation/Silatation 1996 Agriculture, agriculture-storm runoff, channel erosion, dredging, erosion/siltation, hydromodification, irrigated crop production, nonpoint source 79 Estimated: 2021 TBD
pH 2010 Source Unknown 79 Estimated: 2021 TBD

Bennett Slough

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Chlorophyll-a 2010 Source Unknown 1.9 Estimated: 2021 TBD, Also See Lower Salinas TMDL
Low Dissolved Oxygen 2010 Source Unknown 1.9 Estimated: 2021 TBD
pH 2010 Source Unknown 1.9 Estimated: 2021 TBD

Elkhorn Slough

Pollutant First Listed Possible Sources Assessed Area (acres) US EPA TMDL Approval Date TMDL
Low Dissolved Oxygen 2010 Agriculture, Grazing related sources, Natural sources, Urban runoff/storm sewers 2034 Estimated: 2021 TBD
Pesticides 1990 Agriculture return flows, agriculture, agriculture-storm runoff, contaminated sediments, erosion/siltation, irrigated crop production, nonpoint source 2034 Estimated: 2021 TBD
Sedimentation/Siltation 1996 Agriculture, agriculture-storm runoff, channel erosion, irrigated crop production, nonpoint source 2034 Estimated: 2021 TBD
Total Coliform 2010 Source unknown 2034 Estimated: 2021 TBD
pH 2010 Agriculture, grazing related sources, natural sources, urban runoff/storm sewers 2034 Estimated: 2021 TBD

Watsonville Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
E. Coli 2010 Agriculture, Grazing related sources, Natural Sources 5.1 Estimated: 2021 TBD
Fecal Coliform 2010 Agriculture, Grazing related sources, Natural Sources 5.1 Estimated: 2021 TBD
Low Dissolved Oxygen 2010 Agriculture, Grazing related sources, Groundwater loadings, Removal of riparian vegetation 5.1 Estimated: 2021 TBD
Nitrate 2010 Agriculture, Grazing related sources, Groundwater loadings, Removal of riparian vegetation 5.1 Estimated: 2021 TBD
pH 2010 Agriculture, Grazing related sources, Groundwater loadings, Removal of riparian vegetation 5.1 Estimated: 2021 TBD

Carneros Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Ammonia, Unionized 2006 Source Unknown 12 Estimated: 2021 TBD
Chlorophyll-a 2010 Agriculture 12 Estimated: 2021 TBD
Fecal Coliform 2010 Agriculture, natural sources 12 Estimated: 2021 TBD
Low Dissolved Oxygen 2010 Agriculture 12 Estimated: 2021 TBD
Turbidity 2010 Agriculture, Source unknown 12 Estimated: 2021 TBD
pH 2010 Agriculture, Source unknown 12 Estimated: 2021 TBD

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 [7] 2012: Source Unknown 7.8 Est. 2021 TBD

Salinas Valley Watershed

Impaired water bodies in the Salinas Watershed listed downstream to upstream & north to south.


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 Year Round un-ionized ammonia as N must not exceed 0.025mg/L [8]
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 Estuary

Pollutant First Listed Possible Sources Assessed Area (acres) US EPA TMDL Approval Date TMDL
Nutriensts 1992 Agriculture, Agriculture-irrigation tailwater, irrigated crop production, nonpoint source 16 October 13, 2015 See Lower Salinas River Nutrient TMDL
Pesticides 1990 Agriculture return flows, agriculture, agriculture-irrigation tailwater, agriculture-storm runoff, irrigated crop production, nonpoint source 16 October 7, 2011 Will be heard at the May 12-13, 2016 Central Coast Water Board hearing in Watsonville, also see Chlorpyrifos & Diazinon[6]

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.[9]
Low Dissolved Oxygen 2010 Agriculture, Marinas and Recreational Boating, Other Urban Runoff, Removal of Riparian Vegetation 3.8 October 13, 2015 See Lower Salinas River Nutrient TMDL
Nitrate 2010 Agriculture, Other urban runoff 3.8 October 13, 2015 See Lower Salinas River Nutrient TMDL
Sediment Toxicity 2010 Agriculture, Other urban runoff 3.8 Estimated: 2013 Will be heard @ Central Coast Water Board hearing May 12-13 2016 [10]
Turbidity 2010 Agriculture, Other urban runoff 3.8 Estimated: 2013 TBD
Unknown Toxicity 2010 Agriculture, Other urban runoff 3.8 Estimated: 2013 TBD
pH 2010 Agriculture, Other urban runoff 3.8 Estimated: 2013 TBD

Salinas River Lagoon (North)

Pollutant First Listed Possible Sources Assessed Area (acres) US EPA TMDL Approval Date TMDL
Pesticides 1992 Agriculture 197 TBD TBD
Nutrients 1992 Nonpoint Source 197 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L, Orthophosphate < 0.7 to 0.13 mg/L Wet Season: Nitrate < 8 mg/L, Orthophosphate < 0.3 mg/L Year Round: Nitrate < 10 mg/L

Majors Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Copper 2010 Source unknown, Urban runoff/Storm sewers Estimated: 2021 TBD
E. Coli 2010 Natural Sources, Source unknown, Urban runoff/storm sewers Estimated: 2021 TBD
Lead 2010 Source unknown, Urban runoff/storm sewers Estimated: 2021 TBD
Zinc 2010 Source unknown, Urban runoff/storm sewers Estimated: 2021 TBD

Blanco Drain

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Chlorpyrifos 2010 Agriculture, Other urban runoff 15 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[6]
Diazinon 2010 Agriculture 15 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 [6]
Low Dissolved Oxygen 2010 Agriculture, groundwater loadings 15 October 13, 2015 See Lower Salinas River Nutrient TMDL
Nitrate 2010 Agriculture, groundwater loadings 15 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L Wet Season: Nitrate < 8 mg/L, Year Round: Nitrate < 10 mg/L [8]
Pesticides 1998 Agriculture return flows, Agriculture, Agriculture-irrigation tailwater, Agriculture storm runoff, Irrigated crop production, nonpoint source 15 October 7, 2011 See Chlorpyrifos & Diazinon[6]
Turbidity 2010 Agriculture, Removal of riparian vegetation 15 Estimated: 2013 TBD

Tembladero Slough

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Chlorophyll-a 2010 Agriculture, Grazing, Removal of riparian vegetation, Urban runoff/storm sewers 5.5 Estimated: 2013 TBD
Chlorpyrifos 2010 Agriculture, Grazing related sources, Urban runoff/storm sewers 5.5 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[6]
Diazinon 2010 Agriculture, Grazing related sources, Urban runoff/storm sewers 5.5 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 [6]
Enterococcus 2010 Agriculture, Grazing related sources, Urban runoff/storm sewers 5.5 Estimated: 2013 TBD, See Fecal Coliform
E. Coli 2010 Agriculture, Grazing related sources, Urban runoff/storm sewers, Natural sources 5.5 Estimated: 2013 TBD, See Fecal Coliform
Fecal Coliform 2002 Agriculture, Natural sources, Pasture grazing-riparian and/or upland, urban runoff/storm sewers 5.5 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.[9]
Nitrate 2010 Agriculture, urban runoff/storm sewers 5.5 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L Wet Season: Nitrate < 8 mg/L, Year Round: Nitrate < 10 mg/L [8]
Nutrients 1996 Agriculture Return flows, agriculture, agriculture-irrigation tailwater, agriculture-storm runoff, irrigated crop production, nonpoint source 5.5 October 13, 2015 See Lower Salinas River Nutrient TMDL
Pesticides 1996 Agriculture Return flows, agriculture, agriculture-irrigation tailwater, agriculture-storm runoff, irrigated crop production, nonpoint source 5.5 October 7, 2011 See Chlorpyrifos & Diazinon[6]
Sediment Toxicity 2010 Agriculture, grazing related sources, urban runoff/storm sewers 5.5 Estimated: 2013 Will be heard at the May 12-13 2016 Central Coast Water Board hearing in Watsonville[10]
Total Coliform 2010 Agriculture, grazing related sources, natural sources, urban runoff/storm sewers 5.5 Estimated: 2013 TBD, see also Fecal Coliform
Turbidity 2010 Agriculture, grazing related sources, natural sources, urban runoff/storm sewers 5.5 Estimated: 2013 TBD
Unknown Toxicity 2010 Agriculture, grazing related sources, natural sources, urban runoff/storm sewers 5.5 Estimated: 2013 TBD
pH 2010 Agriculture, grazing related sources, natural sources, urban runoff/storm sewers 5.5 Estimated: 2013 TBD

Salinas Reclamation Canal

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Ammonia, Unionized 2006 Agriculture, Grazing, Urban runoff--Industrial Permitted & Non industrial permitted, urban runoff/storm sewers 7.7 October 13, 2015 Year Round un-ionized ammonia as N must not exceed 0.025mg/L [8]
Chlorpyrifos 2010 Agriculture, Grazing, Urban runoff--Industrial Permitted & Non industrial permitted, urban runoff/storm sewers 7.7 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[6]
Copper 2010 Agriculture, Grazing, Urban runoff--Industrial Permitted & Non industrial permitted, urban runoff/storm sewers 7.7 Estimated: 2018 TBD
Diazinon 2010 Agriculture, Grazing, Urban runoff--Industrial Permitted & Non industrial permitted, urban runoff/storm sewers 7.7 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 [6]
E. Coli 2010 Agriculture, Grazing, Natural sources, Urban runoff--Industrial Permitted & Non industrial permitted, urban runoff/storm sewers 7.7 Estimated: 2013 TBD, See also Lower Salinas Fecal Coliform TMDL
Fecal Coliform 2002 Agriculture, Grazing, Removal of riparian vegetation, Urban runoff--Industrial Permitted & Non industrial permitted, urban runoff/storm sewers 7.7 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.[9]
Low Dissolved Oxygen 2002 Agriculture, Grazing, Removal of riparian vegetation, Urban runoff--Industrial Permitted & Non industrial permitted, urban runoff/storm sewers 7.7 October 13, 2015 See Lower Salinas River Nutrients TMDL
Nitrate 2010 Agriculture, Urban runoff, Storm sewers 7.7 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L Wet Season: Nitrate < 8 mg/L, Year Round: Nitrate < 10 mg/L [8]
Pesticides 1992 Agriculture, Agriculture return flows, agriculture irrigation tailwater, agriculture storm runoff, irrigated crop production, minor industrial point source, nonpoint source 7.7 October 7, 2011 Will be heard at the May 12-13, 2016 Central Coast Water Board hearing in Watsonville, also see Chlorpyrifos & Diazinon[6]
Priority Organics 1996 Agriculture, Agriculture return flows, agriculture irrigation tailwater, agriculture storm runoff, irrigated crop production, minor industrial point source, nonpoint source, unknown source 7.7 Estimated: 2013 TBD
Sediment Toxicity 2010 Agriculture, Grazing, Removal of riparian vegetation, urban runoff-- Industrial and Non industrial permitted, urban runoff/storm sewers 7.7 Estimated: 2013 Will be heard at the May 12-13 2016 Central Coast Water Board hearing in Watsonville[10]
Turbidity 2010 Agriculture, Grazing, Removal of riparian vegetation, urban runoff-- Industrial and Non industrial permitted, urban runoff/storm sewers 7.7 Estimated: 2013 TBD
Unknown Toxicity 2010 Agriculture, Grazing, Removal of riparian vegetation, urban runoff-- Industrial and Non industrial permitted, urban runoff/storm sewers 7.7 Estimated: 2013 TBD
pH 2010 Agriculture, Grazing, Removal of riparian vegetation, urban runoff-- Industrial and Non industrial permitted, urban runoff/storm sewers 7.7 Estimated: 2013 TBD

Gabilan Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Ammonia, Unionized 2010 Agriculture, Grazing, Other urban runoff 6.4 October 13, 2015 Year Round un-ionized ammonia as N must not exceed 0.025mg/L [8]
Fecal Coliform 2002 Agriculture, Grazing, Other urban runoff 6.4 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.[9]
Nitrate 2006 Agriculture, Grazing, Other urban runoff 6.4 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L Wet Season: Nitrate < 8 mg/L, Year Round: Nitrate < 10 mg/L [8]
Sediment Toxicity 2010 Agriculture, Grazing, Other urban runoff 6.4 Estimated: 2013 Will be heard at the May 12-13 2016 Central Coast Water Board hearing in Watsonville[10]
Turbidity 2010 Agriculture, Grazing, Other urban runoff 6.4 Estimated: 2013 TBD
pH 2010 Agriculture, Grazing, Other urban runoff 6.4 Estimated: 2013 TBD

Natividad Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Ammonia, Unionized 2010 Agriculture, Grazing, Other urban runoff 7 October 13, 2015 Year Round un-ionized ammonia as N must not exceed 0.025mg/L [8]
E. Coli 2010 Agriculture, Grazing, Other urban runoff 7 Estimated: 2013 TBD, See also Lower Salinas Fecal Coliform TMDL
Low Dissolved Oxygen 2010 Agriculture, Grazing, Removal of riparian vegetation, Other urban runoff 7 October 13, 2015 See Lower Salinas River Nutrients TMDL
Nitrate 2006 Agriculture, Grazing, Other urban runoff, removal of riparian vegetation 7 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L Wet Season: Nitrate < 8 mg/L, Year Round: Nitrate < 10 mg/L [8]
Sediment Toxicity 2010 Agriculture, Grazing, Other urban runoff, removal of riparian vegetation 7 Estimated: 2013 Will be heard at the May 12-13 2016 Central Coast Water Board hearing in Watsonville[10]
Temperature, water 2010 Agriculture, Grazing, Other urban runoff, removal of riparian vegetation 7 Estimated: 2013 TBD
Turbidity 2010 Agriculture, Grazing, Other urban runoff, removal of riparian vegetation 7 Estimated: 2013 TBD
Unknown Toxicity 2010 Agriculture, Grazing, Other urban runoff, removal of riparian vegetation 7 Estimated: 2013 TBD
pH 2010 Agriculture, Grazing, Other urban runoff 7 Estimated: 2013 TBD

Alisal Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Chlorophyll-a 2010 Agriculture 16 Estimated: 2013 TBD, Also See Lower Salinas TMDL
Fecal Coliform 2002 Agriculture, Natural sources, Nonpoint source, urban runoff/storm sewers 16 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.[9]
Nitrate 2002 Agriculture, nonpoint source, urban runoff/storm sewers 16 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L Wet Season: Nitrate < 8 mg/L, Year Round: Nitrate < 10 mg/L [8]
Sodium 2010 Agriculture, nonpoint source, urban runoff/storm sewers 16 Estimated: 2018 TBD

Alisal Slough[11]

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Low Dissolved Oxygen 2010 2010:Agriculture 2012: Source Unknown [12] 7.3 October 13, 2015 See Lower Salinas River Nutrients TMDL
Nitrate 2010 2010:Agriculture 2012: Source Unknown 7.3 October 13, 2015 See Lower Salinas River Nutrient TMDL
Sediment Toxicity 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

Quail Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Ammonia (Unionized) 2010 Agriculture, Grazing, Nurseries 4.2 October 13, 2015 Year Round un-ionized ammonia as N must not exceed 0.025mg/L [8]
Chlorpyrifos 2010 Agriculture, Grazing, Nurseries 4.2 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[6]
Diazinon 2010 Agriculture, Grazing, Nurseries 4.2 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 [6]
E. Coli 2010 Agriculture, Grazing, Nurseries 402 Estimated: 2013 TBD, See also Fecal Coliform
Fecal Coliform 2010 Agriculture, Grazing, Nurseries 4.2 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.[9]
Low Dissolved Oxygen 2010 Agriculture, Grazing, Nurseries, Removal of Riparian Vegetation 4.2 October 13, 2015 TBD, See also Lower Salinas River Nutrient TMDL
Nitrate 2006 Agriculture, Grazing, Nurseries, Removal of Riparian Vegetation 4.2 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L Wet Season: Nitrate < 8 mg/L, Year Round: Nitrate < 10 mg/L [8]
Sediment Toxicity 2010 Agriculture, Grazing, Nurseries 4.2 Estimated: 2013 Will be heard at the May 12-13 2016 Central Coast Water Board hearing in Watsonville[10]
Temperature, water 2010 Agriculture, Removal of Riparian Vegetation 4.2 Estimated: 2013 TBD
Turbidity 2010 Agriculture, Grazing, Removal of Riparian Vegetation 4.2 Estimated: 2013 In Development
Unknown Toxicity 2010 Agriculture, Grazing, Nurseries 4.2 Estimated: 2013 TBD

Chualar Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Ammonia (Unionized) 2010 Agriculture, Other Urban Runoff, Removal of Riparian Vegetation 14 October 13, 2015 Year Round un-ionized ammonia as N must not exceed 0.025mg/L [8]
Chlorpyrifos 2010 Agriculture, Other urban runoff 14 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[6]
Diazinon 2010 Agriculture, Other urban runoff 14 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 Diazinon must not exceed 0.10ppb [6]
E. Coli 2010 Agriculture, Natural Sources, Other urban runoff 14 TBD, See also Fecal Coliform
Fecal Coliform 2010 Agriculture, Natural Sources, Other urban runoff 14 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.[9]
Nitrate 2010 Agriculture, Natural Sources, Other urban runoff 14 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L Wet Season: Nitrate < 8 mg/L, Year Round: Nitrate < 10 mg/L [8]
Temperature, water 2010 Agriculture, other urban runoff, removal of riparian vegetation 14 Estimated: 2013 TBD
Turbidity 2010 Agriculture, other urban runoff, removal of riparian vegetation 14 Estimated: 2013 TBD
Unknown Toxicity 2010 Agriculture, Urban Runoff/Storm Sewers 14 Estimated: 2013 TBD
pH 2010 Agriculture, Urban Runoff/Storm Sewers 14 Estimated: 2013 TBD

Salinas River (Lower, estuary to near Gonzales Rd crossing)

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Chlordane 2010 Unknown 31 Estimated: 2013 TBD
Chloride 2010 Agriculture, Grazing, Natural Sources, other urban runoff 31 Estimated: 2018 TBD
Chlorpyrifos 2010 Agriculture, Grazing, Other urban runoff 31 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[6]
DDD (Dichlorodiphenyldichloroethane) 2010 Source Unknown 31 October 7, 2011 See Diazinon & Chlorpyrifos [6]
Diazinon 2010 Agriculture, Grazing 31 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 [6]
Dieldrin 2010 Source Unknown 31 October 7, 2011 See Diazinon & Chlorpyrifos [6]
Electrical Conductivity 2010 Source Unknown 31 Estimated: 2013 TBD
Enterococcus Bacteria 2010 Agriculture, Grazing, Illigal dumping, Natural sources, Pasture Grazing-Riparian and/or Upland, Transient encampments, Urban Runoff/storm sewers 31 Estimated: 2013 TBD
E. Coli 2010 Agriculture, Grazing, Illigal dumping, Natural sources, Pasture Grazing-Riparian and/or Upland, Transient encampments, Urban Runoff/storm sewers 31 Estimated: 2013 TBD, See also Lower Salinas Fecal Coliform TMDL
Fecal Coliform 2002 Agriculture, Grazing, Illigal dumping, Natural sources, Pasture Grazing-Riparian and/or Upland, Transient encampments, Urban Runoff/storm sewers 31 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.[9]
Nitrate 2006 Agriculture, Grazing, Urban runoff, Storm sewers 31 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L Wet Season: Nitrate < 8 mg/L, Year Round: Nitrate < 10 mg/L [8]
PCBs (Polychlorinated biphenyls) 2010 Source Unknown 31 Estimated: 2013 TBD
Pesticides 1998 Agriculture, Construction/Land Development, Point source, Urban runoff/Storm Sewers 31 October 7, 2011 Will be heard at the May 12-13, 2016 Central Coast Water Board hearing in Watsonville, also see Chlorpyrifos & Diazinon[6]
Sodium 2010 Source Unknown 31 Estimated: 2018 TBD
Total Dissolved Solids 2010 Source Unknown 31 Estimated: 2018 TBD
Toxaphene 1994 Source unknown 31 Estimated: 2013 TBD
Turbidity 2010 Agriculture, Grazing, Other urban runoff 31 Estimated: 2013 TBD
Unknown Toxicity 2010 Agriculture, Grazing, Other urban runoff 31 Estimated: 2013 TBD
pH 2010 Source Unknown 31 Estimated: 2013 TBD

Salinas River (middle, near Gonzales Rd crossing to confluence with Nacimiento River)

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
E. Coli 2010 Agriculture, Grazing, Land Development, Natural Sources, Other Urban Runoff 72 Estimated: 2021 See also Lower Salinas Watershed Fecal Coliform TMDL
Fecal Coliform 2010 Agriculture, Grazing, Natural Sources, Other Urban Runoff 72 Estimated: 2021 TBD, See also Lower Salinas River
Pesticides 2002 Agriculture Return Flows, Agriculture, Agriculture-irrigation tailwater, Agriculture-storm runoff, Irrigated Crop production, Nonpoint source 72 Estimated: 2021 TBD
Temperature, Water 2010 Agriculture, Grazing, Other Urban runoff 72 Estimated: 2021 TBD
Turbidity 2010 Agriculture, Grazing, Other Urban runoff 72 Estimated: 2021 TBD
Unknown Toxicity 2010 Agriculture, Grazing, Other Urban runoff 72 Estimated: 2021 TBD
pH 2010 Agriculture, Grazing, Natural sources, Other Urban runoff 72 Estimated: 2021 TBD

Salinas River (upper,confluence of Nacimiento River to Santa Margarita Reservoir)

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Chloride 2002 Agriculture, Pasture grazing- Riparian and/or Upland, Urban Runoff/Storm Sewers 49 Estimated: 2021 TBD
Sodium 2002 Agriculture, Pasture grazing- Riparian and/or Upland, Urban Runoff/Storm Sewers 49 Estimated: 2021 TBD
pH 2010 Agriculture, Pasture grazing- Riparian and/or Upland, Natural Sources, Urban Runoff/Storm Sewers 49 Estimated: 2021 TBD

Espinosa Lake

Pollutant First Listed Possible Sources Assessed Area (acres) US EPA TMDL Approval Date TMDL
Chlorpyrifos 2010 Unknown 163 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[6]
Diazinon 2010 Agriculture 163 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 [6]

Espinosa Slough

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Ammonia, Unionized 2010 Agriculture 1.4 October 13, 2015 Year Round un-ionized ammonia as N must not exceed 0.025mg/L [8]
Diazinon 2010 Agriculture 1.4 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 [6]
Nitrate 2010 Agriculture 1.4 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L Wet Season: Nitrate < 8 mg/L, Year Round: Nitrate < 10 mg/L [8]
Pesticides 1996 Agriculture, Urban runoff/storm sewers 1.4 October 7, 2011 Will be heard at the May 12-13, 2016 Central Coast Water Board hearing in Watsonville, also see Chlorpyrifos & Diazinon[6]
Priority Organics 1996 Nonpoint source 1.4 Estimated: 2013 TBD
Sediment Toxicity 2010 Agriculture 1.4 Estimated: 2013 Will be heard at the May 12-13 2016 Central Coast Water Board hearing in Watsonville[10]
Turbidity 2010 Agriculture 1.4 Estimated: 2013 TBD
Unknown Toxicity 2010 Agriculture 1.4 Estimated: 2013 TBD
pH 2010 Agriculture 1.4 Estimated: 2013 TBD


Esperanza Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Nitrate 2010 Unknown 3.7 October 13, 2015 Dry Season: Nitrate < 1.4 to 6.4 mg/L Wet Season: Nitrate < 8 mg/L, Year Round: Nitrate < 10 mg/L [8]

Arroyo Seco River

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Fecal Coliform 2010 Unknown 43 Estimated: 2021 TBD
Temperature, water 2010 Unknown 43 Estimated 2021 TBD

San Lorenzo Creek

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
Boron 2002 Unknown 49 Estimated: 2021 TBD
Chloride 2010 Grazing-Related sources, Natural source, Unknown sources 49 Estimated 2021 TBD
Electrical Conductivity 2010 Natural Sources 49 Estimated 2021 TBD
E. Coli 2010 Grazing Related Sources, Natural Sources 49 Estimated: 2021 TBD, see also Fecal Coliform
Fecal Coliform 2002 Grazing Related sources, Natural Sources November 30, 2011 Geometric mean should not exceed 126/100mL, no sample shoudl exceed the 90% confidence level of 409/100mL [13]
Sodium 2010 Grazing Related sources, Natural Sources 49 Estimated: 2120 TBD
pH 2010 Grazing Related sources, Natural Sources 49 Estimated: 2120 TBD

San Antonio River

Pollutant First Listed Possible Sources Assessed Area (miles) US EPA TMDL Approval Date TMDL
E. Coli 2010 Natural Sources, Source Unknown 11 November 30, 2011 Must not exceed log mean of 200\100mL, nor shall more than 10% of samples exceed 400/100mL [14]
Fecal Coliform 2010 Natural Sources, Source Unknown 11 November 30, 2011 Must not exceed log mean of 200\100mL, nor shall more than 10% of samples exceed 400/100mL [14]

San Antonio Resevoir

Pollutant First Listed Possible Sources Assessed Area (acres) US EPA TMDL Approval Date TMDL
Mercury 2010 Source Unknown 5417 Estimated: 2021 TBD


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[15] 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)[16]
Sedimentation/Siltation, 5A 1990 Channel erosion, land development 8.4 Estimated 2021 TBD
  • Harkins Slough
    • Chlorophyll-a, Category 5A
    • Low Dissolved Oxygen, Category 5A
    • Pathogens, Category 5B


Links

References

  1. Watsonville Slough Pathogen TMDL
  2. Pajaro River watershed Chlorpyrifos and Diazinon TMDL
  3. 3.0 3.1 Pajaro River Fecal Coliform TMDL
  4. Pajaro River Nitrate TMDL
  5. Pajaro River Nutrient TMDL
  6. 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 6.12 6.13 6.14 6.15 6.16 6.17 6.18 6.19 6.20 6.21 6.22 6.23 6.24 LOWER SALINAS RIVER WATERSHED CHLORPYRIFOS AND DIAZINON TMDLS
  7. 2010 Integrated Report Alamo Creek Impairments
  8. 8.00 8.01 8.02 8.03 8.04 8.05 8.06 8.07 8.08 8.09 8.10 8.11 8.12 8.13 8.14 8.15 8.16 8.17 [1]
  9. 9.0 9.1 9.2 9.3 9.4 9.5 9.6 9.7 Lower Salinas Fecal Coliform TMDL
  10. 10.0 10.1 10.2 10.3 10.4 10.5 10.6 Salinas River Watershed Sediment Toxicity TMDL
  11. Supporting Info for Alisal Creek
  12. 2012 Integrated Report 303(d) list
  13. San Lorenzo Creek Fecal Coliform TMDL
  14. 14.0 14.1 San Antonio River Fecal Coliform TMDL
  15. [CCRWQCB Aptos Creek Impairments and Evidence CCRWQCB Aptos Creek Impairments and Evidence]
  16. US EPA Aptos TMDL Approval Letter

Disclaimer

This page may contain student work completed as part of assigned coursework. It may not be accurate. It does not necessary reflect the opinion or policy of CSUMB, its staff, or students.