California Code of Regulations
Title 23 - Waters
Division 2 - Department of Water Resources
Chapter 7 - Water Loss Audits and Water Loss Control Reporting
Section 638.3 - Standardized Conduct for Validation of Water Loss Audits

Universal Citation: 23 CA Code of Regs 638.3

Current through Register 2024 Notice Reg. No. 38, September 20, 2024

(a) All water loss audits shall receive a Level 1 validation.

(b) A Level 1 validation shall include:

(1) An interview between the water audit validator and the person or persons who prepared the water loss audit, and any member of the utility staff with information that the water audit validator believes is necessary to complete the Level 1 audit validation.

(2) A review and evaluation of the following documentation:
(A) The completed AWWA Free Water Audit spreadsheet.

(B) The reported water volume from its own sources, as documented by the supply meter(s) or other means, as applicable.

(C) The reported volume of water imported and exported each month by connection.

(D) The documentation of the customer meter and supply meter accuracy testing and calibration.

(E) The reported volume of authorized consumption each month broken down by water rate, if different rates are applied to water users.

(3) A review and evaluation of the accuracy of performance indicators included in the AWWA Free Audit Software.

(4) A review of audit inputs and data grading values to confirm a correct application of methodology, and follow-up reviews (if indicated).

(5) A summary of the validation, including:
(A) Name and contact information of the water audit validator.

(B) A summary of the Level 1 validation utility staff interview, including the basis for the input derivations and the DVS selections.

(C) Any recommended changes to the water audit inputs by the water audit validator that were not accepted by the urban retail water supplier, and the rationale for not accepting the recommendations.

(D) A summary of any follow-up performance indicator reviews.

(E) Overall impressions, including the consistency of performance indicators with system conditions and water loss management practices.

(F) Any recommendations for further validation or water loss audit improvements.

1. New section filed 1-24-2018; operative 1-24-2018 pursuant to Government Code section 11343.4(b)(3) (Register 2018, No. 4).
2. Change without regulatory effect renumbering section 700.3 to new section 638.3 filed 2-22-2018 pursuant to section 100, title 1, California Code of Regulations (Register 2018, No. 8).

Note: Authority cited: Section 10608.34, Water Code. Reference: Section 10608.34, Water Code.

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