The Water Loss Technical Assistance Program (Water Loss TAP) aids urban water suppliers in complying with California Senate Bill 555, requiring utilities to submit a completed and Level 1 validated water loss audit annually to the California Department of Water Resources (DWR).

The Water Loss TAP is brought to you by the California-Nevada Section AWWA.  This project has been funded by the Environmental Protection Agency and the State Water Resources Control Board.  The contents of this website do not necessarily reflect the views and policies of the EPA or the SWRCB, nor does the EPA or the SWRCB endorse trade names or recommend the use of commercial products if mentioned in this website.  

July 2016


October 2017

Remote Work Session

Remote Validation Session

In Person

Work Session

In Person

Work Session

Find us at NAWL for updates and the next steps in water loss for California.


Registered Individuals


Registered Systems


Validated Audits



July 2016 - September 2016

Wave 1 is a day-long in-person work session (classroom) that covers the basics of water auditing and introduces water audit data validation.


  • Introduce Water Loss TAP

  • Begin technical assistance

  • Create utility water audit teams



October 2016 - February 2017

Wave 2 is a teleconference work session in which water auditing experts and each utility’s water audit team examine the utility’s

most recent water audit in a two-hour interview.


  • Review the most recent water audit​

  • Discuss water audit data and data validity scores

  • Amendments as needed



March 2017 - May 2017

Wave 3 is a day-long in-person work session (classroom) that reinforces the water audit methodology before more deeply exploring water audit data validation and the connection between water auditing and water loss control.


  • Continue technical assistance

  • Connect water audits to water loss control

  • Prepare for Wave 4



May 2017 - September 2017

Action Steps

Wave 4 is a teleconference session in which water auditing experts and each utility’s water audit team perform a Level 1 validation of the FY or CY water audit that will be submitted to DWR.

NOTE:  The DWR rules for SB555 compliance are not yet final and may be subject to change.  The latest rule language indicates FY period must be for 2016/17.  


  • Level 1 validate FY or CY water audit

  • Prepare for submitting Level 1 validated water audits to DWR

Compile your most recent water audit and supporting documents, informed by the Wave 2 work session


Schedule a teleconference validation session


Send your water audit and supporting documents to the PMT at least two weeks before your validation session


Participate in your validation session


Receive post-session document & audit from PMT

Submit your Level 1 validated water audit package to DWR through the State Portal.  Login credentials will be those you used for your Urban Water Management Plans. 

The California Water Loss Control Technical Assistance Program (Water Loss TAP) was funded wholly or in part by the United States Environmental Protection Agency and the State Water Resources Control Board, through the State Revolving Fund set-aside for technical assistance.  We are grateful to the EPA and Water Board for their support.  The Water Loss TAP was implemented by the California-Nevada Section AWWA, with support from the WSO/Cavanaugh Program Management Team.   

CA-NV Section AWWA​

(909) 481-7200

10435 Ashford St. 2nd Floor

Rancho Cucamonga, CA 91730