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Drought focuses on identifying options for filling all or portions of the drought year supply shortfall. BAWSCA also developed a Water Conservation Implementation Plan with the following objectives (Bay Area Water Supply Conservation Agency, 2009):  Help BACSWA member agencies evaluate potential water savings and cost-effectiveness associated with additional water conservation measures.  Determine potential present and future water savings from a range of new conservation measures.  Determine BAWSCA’s role in helping member agencies achieve individual water conservation goals.  Develop a regional plan for water conservation measures to serve as a guideline for member agencies. In August 2017, BAWSCA released a drought report outlining state and local drought response actions in three categories:  Demand management actions to reduce water use, including public information and water conservation programs  Water supply actions  Regulatory and policy support. While BAWSCA is the primary water service agent in the County, it is not the only option for community members and businesses. The County Public Works Department operates CSA No. 7 and CSA No. 11. These service areas provide potable water to approximately 70 customers in the La Honda community and 90 customers in the Pescadero community, respectively. CSA 7 also supplies two County facilities—Camp Glenwood Boys Ranch and Sam McDonald Park. Moreover, some County residents have domestic wells on their property. The South Central Regional Office of California Department of Water Resources monitors wells for San Mateo County to help protect groundwater quality. According to the California Natural Resources Agency database of well completion reports by County, there were 10,747 wells within San Mateo County as of May 28, 2020. Defined Drought Levels Neither San Mateo County nor BAWSCA has defined “drought level.” County and regional drought response is determined case by case, and response priorities are typically based on imminence of potential water shortages. BAWSCA has developed both Tier 1 and Tier 2 Drought Implementation Plans; however, these plans do not specify specific trigger levels. The Tier 1 plan is for SFPUC and BAWSCA; the Tier 2 plan is for BAWSCA member agencies. The Tier 2 plan includes calculations to determine water allocations for member agencies during water shortages. Drought stages defined by the California State Water Resources Control Board (see Table 9-1) can serve as a reference for County and stakeholder agencies when determining need for response. 9.2.2 Past Events California Department of Water Resources hydrologic data from the early 1900s shows multi-year droughts from 1912 to 1913, 1918 to 1920, 1922 to 1924, and 1928 to 1934. The 1929 to 1934 drought established the criteria for designing storage capacity and yield for large Northern California reservoirs. The following sections describe the most recent prolonged droughts that have impacted the planning area. 9-7