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Laguna de Santa Rosa TMDLs

Laguna de Santa Rosa Watershed

The Laguna de Santa Rosa is a major tributary of the Russian River and drains a 254 square mile watershed in Sonoma County, California. Major tributaries to the Laguna de Santa Rosa include Windsor Creek, Mark West Creek, Santa Rosa Creek, Blucher Creek, and Copeland Creek.

Impairments

The current 2010 Clean Water Act Section 303(d) List of Impaired Waters (2010 303(d) List) divides the Laguna de Santa Rosa watershed into three water bodies, according to the Hydrologic Sub Areas (HSAs). The water bodies are as follows: the Laguna de Santa Rosa HSA, the Mark West Creek HSA, and the Santa Rosa Creek HSA. The following table details the specific pollutant listings for each water body and the footnotes explain the geographic extent of the impairments, as supported by the data evaluated for the listings. As stated in the footnotes, it is the intent of Regional Water Board staff to clarify the geographic extent of the impairments in the next listing cycle. Regional Water Board staff also intend to remap the Laguna watershed so that the water bodies are not divided by HSAs, but in smaller segments with mainstem reaches separate from tributary water bodies.


2010 Impaired Water Bodies In the Laguna de Santa Rosa Watershed

Water Body HU

Water Body Name

Pollutant

Russian River HU

  • Middle Russian River HA:
  • Laguna de Santa Rosa HSA
  • Mercury1
  • Indicator Bacteria2
  • Dissolved Oxygen3
  • Nitrogen1
  • Phosphorus1
  • Sediment/Siltation
  • Temperature
  • Middle Russian River HA:
  • Mark West Creek HSA4
  • Sediment/Siltation
  • Temperature
  • Middle Russian River HA:
  • Santa Rosa Creek HSA
  • Indicator Bacteria5
  • Sediment/Siltation

Data used to list the Laguna de Santa Rosa HSA for mercury, nitrogen, and phosphorus were limited to the mainstem of the Laguna de Santa Rosa.Impairment of the entire HSA beyond the mainstem is not supported by the data.It is the intent of Regional Water Board staff to clarify the geographic extent of the impairment in the next listing cycle.

Data used to list the Laguna de Santa Rosa HSA for indicator bacteria and data collected more recently support the listing of the mainstem Laguna de Santa Rosa.Impairment of the entire HSA is not supported by the data.It is the intent of Regional Water Board staff to clarify the geographic extent of the impairment in the next listing cycle.

Data used to list the Laguna de Santa Rosa HSA for dissolved oxygen were limited to the mainstem of the Laguna de Santa Rosa and the mainstem of Colgan Creek.Impairment of the entire HSA beyond the mainstem of the Laguna and Colgan Creek is not supported by the data.It is the intent of Regional Water Board staff to clarify the geographic extent of the impairment in the next listing cycle.

The mainstem of the Laguna de Santa Rosa from the confluence with Mark West Creek to the Russian River was erroneously left off the current 2010 303(d) List for impairment by dissolved oxygen, nitrogen, and phosphorus.The 1995 Waste Reduction Strategy for the Laguna de Santa Rosa confirmed these impairments, as did data evaluated during the 2002 303(d) Listing cycle.Regional Water Board staff are currently working on TMDLs to address these, and other, impairments in the larger Laguna de Santa Rosa watershed.It is the intent of Regional Water Board staff to correct the omission of these pollutants from the 303(d) list in the next listing cycle

Data used to list the Santa Rosa Creek HSA for indicator bacteria were limited to the mainstem Santa Rosa Creek.Impairment of the entire HSA beyond the mainstem is not supported by the data.It is the intent of Regional Water Board staff to clarify the geographic extent of the impairment in the next listing cycle.

Nutrient, Dissolved Oxygen, Temperature, and Sediment TMDLs

A TMDL for high levels of ammonia and low dissolved oxygen concentrations was approved by the US EPA in 1995 as the Waste Reduction Strategy for the Laguna de Santa Rosa.  The Waste Reduction Strategy focused on the reduction of nitrogen loading from point and non-point sources.

Regional Water Board staff are currently developing new TMDLs for nitrogen, phosphorus, dissolved oxygen, temperature, and sediment in the Laguna de Santa Rosa watershed to address continuing water quality impairments.   These TMDLs will apply to entire Laguna de Santa Rosa watershed, including Mark West Creek, Santa Rosa Creek, and all the tributaries.

Stakeholder & Community Involvement

In order for the Laguna TMDLs to be successful in addressing water quality impairments in the Laguna de Santa Rosa, it is imperative for staff to work with stakeholders and members of the community.  Stakeholders are landowners, residents, business owners, special interest groups, government officials and staff, academics, non-governmental organizations, and other interested parties. 

Regional Water Board staff have developed a Stakeholder Plan to help facilitate successful, effective, and efficient stakeholder involvement.

Status Update

Regional Water Board staff presented a status update of the Laguna TMDLs to the Regional Water Board and the public on January 27, 2011 and July 15, 2010.  

Staff will present a status update to the Regional Water Board on December 6, 2012.

Monitoring Plans & Reports

Regional Water Board staff have completed the majority of the monitoring to support the development of the TMDLs.  The following documents detail the monitoring plan, Quality Assurance Project Plan, and results.

Technical Memoranda

Regional Water Board staff have completed several technical memoranda that document and describe analyses and assessments to support the development of the TMDLs. These memoranda and their findings and conclusions are subject to change as staff continue to develop the TMDLs.

Other Available Documents

Pathogen / Indicator Bacteria TMDLs

The indicator bacteria listings in the Laguna de Santa Rosa and Santa Rosa Creek are being addressed as part of the larger Russian River Pathogen TMDL development effort.  Please refer to the Russian River TMDL page for more information.

Mercury Impairment

A TMDL or other program to address the mercury listing for the Laguna de Santa Rosa is not yet scheduled.

Other Available Documents

Contact Information

David Kuszmar, Project Manager
707-576-2693
david.kuszmar@waterboards.ca.gov

Rebecca Fitzgerald, TMDL Unit Supervisor
707-576-2650
rebecca.fitzgerald@waterboards.ca.gov
Steve Butkus, Technical Specialist
707-576-2834
steve.butkus@waterboards.ca.gov

Updated December 10, 2013