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The Napa County Flood Control and Water Conservation District (District) entered into a Water Supply Contract (Contract) with DWR on December 19, 1963. This contract provided the District with water supplies from the SWP. Subsequently, the District entered into sub-contracts with the cities of Napa, American Canyon and Calistoga. These agencies are referred to as "Member Units."
The District may request up to 29,025 acre-feet of water annually from the SWP, for use by the three cities. For 2021, the approved allocation was 5% or 1,451 acre-feet. There is a prior year carryover of 4,853 acre-feet.
The SWP applies to the sustainability of ongoing municipal water service deliveries. Surface water resources are accounted for in the water budget for the subbasin in the GSP.
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On October 5, 2020, the LAFCO adopted the Napa Countywide Water and Wastewater Municipal Service Review (MSR). LAFCO is required to prepare a Countywide Water MSR by the Cortese-Knox-Hertzberg Local Government Reorganization Act of 2000 (Government Code §56000, et seq.), which took effect on January 1, 2001. The water and wastewater service review examines services provided by public agencies whose boundaries and governance are subject to LAFCO.
The MSR reviewed the water service adequacy for each of the 14 agency providers, including distribution system integrity as defined by breaks and leaks and system water loss, and drinking water quality. Based on these indicators, it was found that all agencies in Napa provide at least minimally adequate water service.
The MSR identified various challenges to water service providers in Napa County, including:
One recommendation to address various challenges to water service provisions identified in the MSR is to promote regionalization of planning and solidarity of organization for water resources. Governance options include a single agency to conduct water supply management on a regional or countywide level, such as a county water agency and/or an agency to provide management and operational support to the smaller utility systems that could benefit from the consolidation of certain services (i.e., lab testing) or from fully transitioning to operations by a regional agency, such as a county water district. A county water agency, county water district, or joint powers authority would provide a means to improve efficiency of water supply management in the County, as well as continued and enhanced resource sharing.
The MSR identified several challenges to forming a countywide water agency or district, including:
It should also be noted that there are multiple agencies (Federal, State, and local) involved in regulating and supplying water. The LAFCO study identified 14 cities, town, and districts that provide water service. There are also over 150 community water systems, and transient and non-transient non-community water systems. This is in addition to the thousands of individual domestic and agricultural wells. These water systems and wells are not inter-connected into an integrated water supply system of pipes and canals; there is no ability to move water from where it is plentiful to where it is needed without trucking. The level of complexity and effort required to develop a plan for countywide water distribution would take many years to complete (assuming that all parties were agreeable and no outside parties litigated) and would not provide any immediate solutions for the current emergency.
In 2017, the City allowed 11.6 million gallons of trucked water for non-construction related uses, equivalent to 3,612 truckloads or 35.47 acre-feet. City staff estimated at that time that approximately 50% of all non-construction trucked water was for residential use.
As part of a proposal to expand water restrictions, the City of Napa is considering the following additional requirements:
Terminate all temporary hydrant meters beginning August 1 – contracts will be required to re-establish temporary hydrant meters after August 1.