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 are now a coming permanent requirement. California Senate Bill 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 (2015). 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 of the previous legislation, the department will be establishing validated water loss audit requirements for the submittal of annual validated water loss audits.


Below is the 15-Day Notice for the revised Proposed Rulemaking on Validated Water Loss Audit Reporting, the revised Proposed Regulations for Validated Water Loss Audit Reporting Requirements, and an Updated Informational Digest. Comments on the revised Proposed Regulations are due June 2, 2017.

Notice of 15-Day Comment Periond

Revised Proposed Regualtions

Updated Informative Digest

Written comments must be submitted before 5:00 P.M. on June 2, 2017. The Department will consider only comments on the proposed changes. Comments must be submitted with post mark or date no later than June2. Please submit any comments regarding this action addressed to:

Todd Thompson, P.E.
Water Use Efficiency
P.O. Box 942836
Sacramento, CA 94236

Regulations for Validating Water Loss Audits

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

Notice of Proposed Rulemaking

Draft Regulations for Validated Water Loss Audit Reporting Requirements

Initial Statement of Reasons

The Department of Water Resources (Department) will conduct a public hearing at the time and place noted below to consider the adoption of regulations regarding the conduct of Water Loss Audits and Water Loss Control Reporting. The proposed regulations would require all urban retail water suppliers to conduct annual water loss audits, validate the accuracy of those audits, and submit them to the Department for review and website posting.


A public hearing will be held in accordance with the requirements set forth in Government Code section 11346.8. The hearing details are as follow:

Time: 10:00 AM
Date: April 17, 2017

Bonderson Hearing Room
901 P St. Sacramento
CA 95814


Interested members of the public may present comments orally or in writing at the hearing and may provide comments by postal mail or by electronic submittal before the end of the comment period. The public comment period for this regulatory action will begin on March 3, 2017. Written comments not physically submitted at the hearing must be submitted before 5:00 P.M. on April 17, 2017. The Department will consider only comments submitted with post mark or date no later than said date. Please submit any comments regarding this action addressed to:

Todd Thompson, P.E.
Water Use Efficiency
P.O. Box 942836
Sacramento, CA 94236


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


Water Systems Optimization and Cavanaugh & Associates

California Water Association


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

California-Nevada 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 shortterm 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.

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

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

ToddThompson, Civil & Agricultural P.E.
Senior Engineer, Water Resources
Department of Water Resources
(916) 651-9255