Department of Water Resources Home

Water Loss Audits

Division of Statewide Integrated Water Management

Water Use Efficiency
901 P Street Sacramento, CA 95814-3515

Mailing Address:
P.O. Box 942836
Sacramento, CA 94236-0001

Validated Water Loss Audit Reporting

Water loss audits will soon become a permanent requirement. California Senate Bill 555 (SB 555), passed in October 2015, requires all urban retail water suppliers in the state to submit a completed and validated water loss audit annually to the California Department of Water Resources (DWR) beginning October 2017. Previously, Senate Bill 1420 established that urban water suppliers submit a report that quantifies water system losses with their urban water management plans. As a result SB 555, the department will be establishing validated water loss audit requirements for the submittal of annual validated water loss audits.

Water Loss Audit Regulations Approved!

On October 18, 2017, the California Water Commission approved the Regulations for Validated Water Loss Audit Reporting. A clean copy of the approved regulations can be found below. The approved regulations will not be final until they are also approved by the California Office of Administrative Law (OAL).

Water Loss Audit Submissions Posted!

The water loss audit reports submitted to DWR, as required by Senate Bill 555, are now posted online. Although DWR has posted the water loss audit reports, DWR has not reviewed the reports and will not review until the time when the regulations are approved by OAL. The regulations are not considered final until they are reviewed and approved by OAL. Please read further before continuing to view the water loss audits.

Water loss audits evaluate real and apparent water losses occurring in a potable distribution system. Estimating the scale and cost of these losses allows utilities to identify opportunities for saving water and recovering revenue. For the first time in California, water loss audit submissions were reviewed by validators to guarantee consistency. The scope of this review followed the validation methodology detailed in Water Research Foundation project 4639: Level 1 Water Audit Validation. Level 1 water audit validation aims to:

  1. Identify and, where possible, correct inaccuracies in water audit data and application of methodology
  2. Evaluate and communicate the uncertainty inherent in water audit data


A Level 1 validation does not guarantee accurate estimations of losses. Level 1 water audit validation is conducted through review of the summary data supporting a water audit and an interview with staff about water audit data and operational procedures. As a result, a Level 1 validation improves audit reliability but does not diagnose and correct errors buried in raw data or resulting from instrument inaccuracy, both of which require deeper investigation (Level 2 or Level 3 validations respectively) to unearth.

Go to posted water loss audit database:

https://wuedata.water.ca.gov/awwa_plans

For more information about the water audit and the distinct forms of water loss, please refer to American Water Works Association manual M36: Water Audits and Loss Control Programs at the link below:

https://www.awwa.org/Portals/0/files/publications/documents/M36LookInside.pdf

Rulemaking File:

2ND 15-DAY NOTICE FOR THE PROPOSED REGULATIONS FOR VALIDATED WATER LOSS AUDIT REPORTING

Below is information regarding the 2nd 15-Day Notice for the revised Proposed Rulemaking on Validated Water Loss Audit Reporting.

Notice of 2nd 15-Day Comment Period

Revised Proposed Regulations

Updated Informative Digest

COMMENTS RECEIVED DURING 2nd 15-DAY COMMENT PERIOD (6/16/17 to 7/3/17)

Arcadis, U.S., Inc.
Water Systems Optimization and Cavanaugh & Associates
Coalition Letter
Irvine Ranch Water District
Eastern Municipal Water District
Otay Water District
Padre Dam Municipal Water District
City of Poway
Valley Center Municipal Water District
Santa Fe Irrigation District
City of Oceanside
Olivenhain Water District
Helix Water District
City of San Diego
City of Santa Rosa
Vallecitos Water District
Kunkel Water Efficiency Consulting
NRDC & Pacific Institute
Carlsbad Municipal Water District

15-DAY NOTICE FOR THE PROPOSED REGULATIONS FOR VALIDATED WATER LOSS AUDIT REPORTING

Below is information regarding the 15-Day Notice for the revised Proposed Rulemaking on Validated Water Loss Audit Reporting.

15-Day Notice of Comment Period

Revised Proposed Regulations

Updated Informative Digest

COMMENTS RECEIVED DURING 15-DAY COMMENT PERIOD (5/18/17 TO 6/2/17)

Rich Farrington
San Antonio Water
Great Oaks Water Company
City of Los Angeles Department of Water and Power
Kunkel Water Efficiency Consulting
CA-NV AWWA
Arcadis, U.S., Inc.
Metropolitan Water District
NGO Joint Comments
ACWA
Water Systems Optimization and Cavanaugh & Associates
Regional Water Authority
California Legislators
Municipal Water District of Orange County

Regulations for Validating Water Loss Audits

Below is the original Draft Regulations for Validated Water Loss Audit Reporting Requirements, and an Initial Statement of Reasons that were sent out on March 3, 2017.

Draft Regulations for Validated Water Loss Audit Reporting Requirements

Initial Statement of Reasons

COMMENTS RECEIVED DURING 45-DAY COMMENT PERIOD (3/3/17 TO 4/17/17):

Regional Water Authority1
Regional Water Authority2
Town of Windsor
City of Santa Rosa
San Jose Water Company
Eastern Municipal Water District
City of Olivenhain
San Juan Water District
San Francisco PUC
California Municipal Utilities Association
Los Angeles Department of Water and Power
Irvine Ranch Water District
Great Oaks Water Company
Municipal Water District of Orange County
CA-NV AWWA
Water Systems Optimization and Cavanaugh & Associates
California Water Association
Arcadis
San Gabriel Valley Water Company
Association of California Water Agencies
California Water Service
San Diego County Water Authority
Natural Resources Defense Council
Public Hearing 4/17/2017

CA-NV Section of American Water Works Association Technical Assistance Program

CA-NV AWWA is leading a broad group of stakeholders that came together in 2015 to combat water loss in California. The California Water Loss Control Collaborative includes utility personnel, industry organizations, non-profits as well as state entities. The goal of the Collaborative is to improve knowledge of non-revenue water and provide technical assistance to utility personnel in the identification and control of real and apparent distribution systems water losses. As stipulated in the legislation, participation with the technical assistance program will result in a validated water loss audit that meets the October 2017 requirements. This program is currently a clear way to achieve compliance with the SB 555 for the first year. For more information, click here!

The State Water Resources Control Board provided the $3.2 million in funding that resulted in the formation of a Water Loss Technical Assistance Program (Water Loss TAP).

Water Loss Audit Resources

Technical Assistance with Leak Detection

DWR’s Regional Offices have leak detection equipment available for short-term loan to a water agency and will provide assistance to local water agencies seeking to conduct a water audit and leak detection survey of their distribution system. Please click here to learn more about the regional office in your area available for leak detection assistance.

http://www.water.ca.gov/wateruseefficiency/wlaudits/

If you are interested in the draft regulations for validated water loss audits and would like to be placed on an interested party list for this effort, please send an email address to Todd Thompson at todd.thompson@water.ca.gov.

If you have any questions regarding validated water loss audits, please contact:

Todd Thompson, Civil & Agricultural P.E.
Senior Engineer, Water Resources
Department of Water Resources
(916) 651-9255
todd.thompson@water.ca.gov