AWWA COMMENT PERIOD ON AWWA C670, Online Chlorine Analyzer Operation and Maintenance

AWWA COMMENT PERIOD ON AWWA C670, Online Chlorine Analyzer Operation and Maintenance
July 11, 2025

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 (ETSsupport@awwa.org). 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 closes on August 25, 2025.

Send comments to:
Liz Ralph, LRalph@awwa.org
303.347.6177 phone

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 Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.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.

SCOPE
This standard describes online chlorine analyzer operation and maintenance (O&M) when the online chlorine analyzer is used for monitoring in the treatment of potable water, reclaimed water, or wastewater.

MAJOR REVISIONS
Major changes made to the standard in this revision include the following:

1. Updated Sec. I.C. Acceptance in the Foreword with the latest Standards Council language reflecting the addition of reference to NSF/ANSI/CAN 372 and NSF/ANSI/CAN 600.
2. In Sec. 3 , Definitions, #25 Photometric method was revised.
3. 4.1.2 Photometric chlorine analyzers was revised to include monochloramine.
4. 4.2.1 Amperometric chlorine analyzers was expanded to provide additional information on the two types of chlorine sensors: membrane type and bare electrode systems.
5. 4.2.2 Photometric chlorine analyzers was revised to provide information on monochloramine.
6. 4.6.3 Flow requirements was updated to address pressure pulses at the sampling point and provide sampling pump guidance.
7. 4.7.4.1 Noise was revised to address interference with instrument electronics.