Pinto Lake catchment TMDL addressing cyanobacterial blooms


On 16 July 2020, the Central Coast Regional Water Quality Control Board adopted a total maximum daily load (TMDL) for phosphorus and an associated implementation strategy for improving water quality in Pinto Lake, located in Santa Cruz County. Reducing phosphorus loading to Pinto Lake is anticipated to reduce the frequency and severity of cyanobacteria blooms. The TMDL implementation strategy describes how the Water Board’s regulatory mechanisms, and non-regulatory actions will address phosphorus loads from various sources in order to attain water quality standards.


Approved TMDL documents

TMDL Documents Available for Public Review and Comment (March 13 - May 1, 2020)

Any document not available for download here may be obtained by email or in hard copy by contacting Pete Osmolovsky (see contacts box).

Supplementary Information

TMDL Development Documentation

For Additional Information

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Status and Public Notices

Approval status

  • Adopted by the Central Coast Water Board on July 16, 2020
  • Approved by the State Water Resources Control Board April 20, 2021
  • Approved by the Office of Administrative Law September 9, 2021
  • Approved by the US Environmental Protection Agency on November 21, 2021.