San Lorenzo Valley Water District Water Supply Master Plan

Nicholas M. Johnson
Posted on: 4/30/2009 - Updated on: 3/06/2020

Posted by

Kirsten Feifel



This Water Supply Master Plan for the San Lorenzo Valley Water District (SLVWD or District), Santa Cruz County, California, achieves the following:

  • Documents the District’s conjunctive use of diverted streamflow and pumped groundwater on a monthly basis for 1984-2008, where conjunctive is broadly defined as the optimized, sustainable use of multiple sources of water throughout annual and long-term climatic cycles.
  • Evaluates the production potential of its available water resources as defined by climate, watershed hydrology, aquifer hydrogeology, water quality, water rights, and infrastructure (i.e., water collection, treatment, storage, and conveyance).
  • Demonstrates alternatives for sustainably supplying monthly water demand projected for 2030 and a repeat of the 1984-2008 climatic cycle.

On the basis of this analysis, recommends: 

  • Implementation of an intertie between the northern and southern service areas.
  • Exercising its entitlement to a portion of the yield of Loch Lomond reservoir.
  • Technically supports subsequent District efforts regarding planning, environmental assessment, design, and project implementation.


San Lorenzo Valley Water District. (2009). San Lorenzo Valley Water District Water Supply Master Plan. Retrieved from CAKE:

Affiliated Organizations

The San Lorenzo Water District was established in 1941 and today has over 7,500 connections serving over 22,500 people an average of 2.0 million gallons of water per day. The District’s active water sources include five stream diversions and seven groundwater wells. During the wet seasons, the District relies on surface water sources; but during the dry seasons, the District shifts its reliance to ground water aquifers.


Document Type
Sector Addressed
Target Climate Changes and Impacts
Type of Adaptation Action/Strategy

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