AWWA Articles


September 20, 2019

AWWA solicits public comments on all proposed new AWWA Standards, and on all proposed revisions, reaffirmations, or withdrawals of existing AWWA Standards. The referenced standards project is being considered for approval and the publication of this notice begins the 45-day public comment period for AWWA and ANSI. An electronic public review copy of the proposed standard can be obtained for review during the comment period by emailing ETS Support. Comments must be submitted in writing to the AWWA contact listed below no later than the last day of the comment period specified herein. Such comments shall be specific to the section(s) of the standard under review and include sufficient detail so as to enable the reader to understand the commenter's position, concerns and suggested alternative language, if appropriate.

AWWA Comment Period closed on November 4, 2019.

Send comments to:

Emily Meek

303.347.6192 phone

303.795.7603 fax

The review copy will be edited for publication and may also be revised as appropriate based on any comments received during the public comment period. Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.

Final publication of the standard may take several months. When it is available, a notice will be published in the official notice section of Journal - American Water Works Association. The standard becomes an effective AWWA standard on the first day of the month following such publication in Journal - American Water Works Association.


This standard for disinfection of water-storage facilities describes materials, facility preparation, application of disinfectant to interior surfaces of facilities, and sampling and testing for the presence of coliform bacteria, chlorine residual, and acceptable aesthetic water quality. The standard also includes disinfection procedures for underwater inspection and/or cleaning of potable-water-storage facilities but does not describe the technical aspects of underwater inspection and/or cleaning. All new storage facilities shall be disinfected before they are placed in service. Depending upon the nature of work performed on an existing tank, and the potential for contamination, disinfection and/or sampling only may be appropriate. Storage facilities dewatered for purposes of entering the tank and performing painting, repairs, or other highly invasive activities shall be disinfected and sampled.  In some cases, the tank may remain in service, or isolated, for minimally intrusive activities such as ROV or diver inspections.  Where rigorous sanitary procedures have been followed, only sampling may be required.

This standard is meant to be used for tanks within public water systems and is not intended for storage tanks within premise plumbing systems in buildings.  Premise plumbing components in buildings use a wide variety of materials, including some that may not be compatible with the chlorine concentrations in this standard.


Major Revisions

Major changes made in this revision of ANSI/AWWA C652 are as follows:

1. Additions were made to address concerns in achieving chlorine levels in chloraminated systems throughout the standard.

2. Clarification added that this standard is for use with public water system tanks, not tanks to be used within premise plumbing systems (Sec. III and Sec. 1.1)

3. Provides clarification on when disinfection, sampling, or both may be required (Sec. II.A. and Sec. 1.1).

4. Acknowledges ROVs may be used for tank inspections throughout standard.

5. For dechlorination procedures, the standard now refers to AWWA C655 Field Dechlorination.  Appendix C was deleted.

6. Definitions for Chloramine, Inspection firm, Liquid chlorine (gas), Reclaimed water, and Wastewater have been added.