Water Supply, Quality & Planning

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Urban Water Management Planning

The State of California mandates that all urban water suppliers within the state prepare an Urban Water Management Plan (UWMP). The purpose of the UWMP is for urban water suppliers to describe their long-term resource planning, and ensure adequate water supplies to help identify existing and future water demands are achieved. Every urban water supplier that either provides over 3,000 acre-feet of water annually, or serves more than 3,000 urban connections is required to assess the reliability of its water sources over a 20-year planning horizon, and report its progress on 20% reduction in per-capita urban water consumption by the year 2020, as required in the Water Conservation Bill of 2009 SBX7-7 [PDF].

The UWMP is to be prepared every five years and submitted to the Department of Water Resources (DWR) for review to ensure it meets the requirements identified in the Water Code, Sections §10608– 10656. Once approved by DWR, the status of the report is forwarded to the Legislature.

Water Conservation Bill of 2009 SBX7-7

2020 Urban Water Management Plan

2020 Water Shortage Contingency Plan

Addendum to 2015 UWMP 

Water Master Plan

 The City has prepared a Water Master Plan that was finalized in 2018 that focuses on infrastructure improvements.

Water Quality

The City Public Works Department is dedicated to providing you with a dependable supply of high-quality water. The Department distributes up to 15 million gallons of water each day to more than 17,000 residences and businesses. Our mission is to provide high-quality water that meets or exceeds the stringent water quality standards established by the U.S. Environmental Protection Agency (EPA) and the State Water Resources Control Board (SWRCB).

To ensure that tap water is safe to drink, the California Department of Health Services (DHS) prescribes regulations that limit the amount of certain contaminants in water provided by public water systems. The quality of our drinking water currently meets all State requirements for safe water. Please see the link below to access the most current Annual Water Quality Report for Thousand Oaks.

Previous Water Quality Reports

Additional Resources

  • Water Service Providers Map [PDF]: Detailed mapping of water purveyors throughout Thousand Oaks.
  • Metropolitan Water District of Southern California:  State Water Project supplies are considered to be most vulnerable to urban/stormwater runoff, wildlife, agriculture, recreation, and wastewater. The MWD provides additional information on water quality and distribution for Southern California and many other educational resources.  For any further questions, contact the Metropolitan Water District by phone at (213) 217-6850.

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