Resolution No. R3-2005-0106, adopted on September 9, 2005 by the Central Coast Regional Water Quality Control Board (Central Coast Water Board), modified the regulatory provisions of the Water Quality Control Plan for the Central Coast Region. The State Water Resources Control Board (State Water Board) approved the amendment on June 21, 2006, under Resolution No. 2006-0045. Resolution No. R3-2005-0106 established the San Luis Obispo Creek Total Maximum Daily Load (TMDL) and Implementation Plan for Nitrate-Nitrogen (nitrate-N). The TMDL addresses impairment of San Luis Obispo Creek due to nitrate-N. Current nitrate-N concentrations in San Luis Obispo Creek are impairing the beneficial uses of the municipal and domestic supply of water. The TMDL establishes a numeric target for nitrate-N consistent with the current Water Quality Control Plan objective protecting the municipal and domestic water supply beneficial use. Responsibility for achieving the numeric target falls upon several entities as described in the resolution. The TMDL utilizes an implicit margin of safety to account for uncertainties. The Central Coast Water Board is relying on existing regulatory authority to ensure that implementation actions are carried out, through National Pollutant Discharge Elimination System permits, waste discharge requirements, and waivers. An implementation target date of the year 2012 is established for achieving the TMDL. The Central Coast Water Board will track progress towards achieving the TMDL through review of implementation actions and monitoring conducted by the implementing parties. Central Coast Water Board staff plans to conduct triennial reviews of implementation actions and monitoring results. If the triennial review shows that existing efforts will not achieve the TMDL as scheduled, the Executive Officer of the Central Coast Water Board may require changes to existing monitoring, reporting, or implementation efforts, pursuant to California Water Code section 13267 or section 13383.