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Urban Water Management Plan

The following plan has been prepared in accordance with State of California Assembly Bill 797(AB 797) and the Urban Water Management Planning Act outlined in Section 10610 of

Division 6 of the California Water Code. Assembly Bill (AB) 797, adopted in 1983, required all water suppliers in California with more than 3,000 customers or a demand exceeding 3,000 acrefeet(ac-ft) annually to prepare and adopt an urban water management plan (UWMP) by 1985.

The legislation also required the suppliers to adopt follow-up plans by December 31, 1990.

AB 2661, adopted in July 1990, formally extended the process, requiring suppliers to update their plans every five years. Subsequently, Senate Bill (SB) 553 was signed into law on September 28, 2000. SB 553 revised the Urban Water Management Planning Act by replacing the content of the 16 Demand Management Measures (DMMs) with the 14 Best Management Practices (BMPs) currently being implemented by Group 1 signatories to the Memorandum of Understanding Regarding Urban Water Conservation in California.

In 2003, the City of Lathrop (City) prepared its first UWMP because the number of customers served by the City water system exceeded 3,000. The City began preparing this UWMP in 2005.

Completion of this UWMP, however, was deferred while the City conducted a water supply study (WSS) [1]. The WSS was completed in January 2009, and findings of the WSS have been incorporated into this UWMP.

2005 Urban Water Management Plan

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