Water Supply & Quality

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.

The UWMP is to be prepared every 5 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.

The City has completed a draft plan and has scheduled a City Council public hearing at 6PM on June 28, 2016. A copy of the draft plan is available for review.

2015 Urban Water Management Plan

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 16,000 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 of California Department of Health Services (DOHS).

In order 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 2015 Annual Water Quality Report for Thousand Oaks.

Annual Water Quality Report (pdf)

Helpful Tips for Homeowners

Why test my water?

  • To help ensure that your drinking water is safe.
  • Regular testing is necessary to determine specific water quality problems.
  • To help ensure you are using water suitable for your intended agricultural use.
  • To help determine the effectiveness of your water treatment system.

The quality of a water source may change over time, sometimes suddenly. Many changes can go unnoticed as the water may look, smell and taste the same as it always did. Private water users should test at least yearly for bacteria and other chemicals that may be of interest.

Monitoring your water quality is necessary to ensure your treatment system is working effectively, providing the best quality water for your intended use. For examples of home water testing, please refer to the EPA brochure on home water testing. 

Maintaining High Water Quality at Home


The only difference between some bottled water and City of Thousand Oaks water is that one comes from your faucet and the other comes in bottles. Read up on Tap Water Facts for additional information. for additional information.  

Reading Your Meter

Reading your water meter will tell you how much water you're using and whether you have a leak. Most meters are located near the curb in front of your home or business, under a concrete lid.

Billing units are in hundred cubic feet "HCF"; to obtain HCF, read all digits except the last two. Subtract your last reading from the current reading to determine your use in hundred cubic feet. To convert your usage to gallons, multiply by 750 (one hundred cubic feet (1 HCF) equals 748 gallons). To check for leaks, turn off all water inside and outside your residence -- if the flow indicator (colored plastic triangle on the face of the meter) moves or rotates, then you have a water leak.

Additional Resources

Tap vs. Bottled Water Facts: The only difference between some bottled water and City of Thousand Oaks water is that one comes from your faucet and the other comes in bottles. Read up on some facts on bottled water here

Water Service Providers Map: Detailed mapping of water service providers throughout Thousand Oaks.

EPA Water Quality Standards: Water quality standards are the foundation of the water quality-based pollution control program mandated by the Clean Water Act. Water Quality Standards define the goals for a water body by designating its uses, setting criteria to protect those uses, and establishing provisions such as anti-degradation policies to protect water bodies from pollutants. Visit their website for up to date information on federal, state and regional water quality standards.

Metropolitan Water District of Southern California:  State Water Project supplies are considered to be most vulnerable to urban/storm water 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.