Lake San Marcos Water Quality

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Lake San Marcos Water Quality

water flowing over a dam

Great Ecology is currently conducting biological and hydrological investigations of Lake San Marcos, a 303(d)-listed nutrient-impaired water body in Southern California, in fulfillment of Investigative Order. No. R9-2011-0033 and in support of ongoing mediation and litigation.

For the past 7 years, Great Ecology staff have worked closely with the lake owner, Citizen’s Development Corporation (CDC), Regional Water Board (RB), public agency defendants, and the lake homeowner community to characterize the site with field sampling and laboratory analyses. We have submitted the following data to the Regional Water Board: monthly water quality monitoring data; sediment nutrient flux results; fish, phytoplankton, and zooplankton monitoring; dry and wet weather stormwater data; bathymetric survey results; an assessment of lake vegetation; upstream biomonitoring data; reports detailing in-lake pilot study efforts to reduce phosphorus via alum and Phoslock application and associated permitting documentation for these efforts; and annual water level budgets for the lake’s Water Rights license . Data collected by Great Ecology is being used to create a lake management strategy to address both water and nutrient-associated issues.

Great Ecology’s team, led by Nick Buhbe, developed the Investigation Work Plan, Sampling and Analysis Plan (SAP), Quality Assurance Program Plan (QAPP), and Health and Safety Plan (HASP) associated with the Order and subsequently approved by the RB in 2012. The scope of work conducted on the lake to-date exceeds the minimum requirements of the plan and has been conducted with the ongoing approval of the Regional Water Board and the lake owner.

About this Project

  • Key Services: Biological Assessments, Biological Investigations, Hydrological Investigations, Stormwater Sampling, Litigation Support
  • Regulatory Nexus: 303-d listed nutrient impaired water (Clean Water Act)
  • Lake Area: 56 acres
  • Watershed Area: 18,450 acres

San Marcos, CA