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Disinfection of Facilities
AWWA disinfection standards cover the B300 series, which govern the processes and methodologies used to sanitize water and water storage facilities. These standards cover chemicals such as chlorine and techniques used to sterilize a variety of different apparatuses like wells, turbidimeters, and plants for the safe storage and transport of potable water and wastewater.
AWWA C651-2023
AWWA C651-23 Disinfecting Water Mains
The purpose of this standard is to define the minimum disinfection, sampling, and handling requirements when installing new mains or repairing a main break. These requirements identify when disinfection is required based on the level of public health risk. Included in this standard are requirements for disinfection of water mains, preparation and sanitary handling of water mains, application of chlorine, and sampling and testing for free chlorine residuals and the presence of coliform bacteria.
AWWA C652-2025
Disinfection of Water-Storage Facilities
The purpose of this standard is to define the minimum requirements for the disinfection of water-storage facilities, including the preparation of water-storage facilities, application of chlorine, procedures for disinfecting underwater inspection and cleaning equipment, and sampling and testing for the presence of coliform bacteria, chlorine residual, and acceptable aesthetic water quality.
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AWWA C653-2020
Disinfection of Water Treatment Plant
This standard describes chlorination materials, procedures, and requirements for disinfection of new treatment facilities and existing water treatment facilities temporarily taken out of service for cleaning, inspection, maintenance, painting, repair, or any other activity or event that might lead to contamination of water. Typically, this standard applies to treatment components, including filter basins, filter media, clearwells, pump suction wells, and associated piping and appurtenances located downstream from the filter influent, or from the first point of application of disinfectant in the treatment process, or all portions of a facility if no primary disinfection is provided.
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AWWA C654-2021
Disinfection of Wells
This standard describes the procedures for disinfection and bacteriological testing of wells for potable water service following construction, servicing, maintenance, or any other activity or event that might lead to contamination of the water.
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AWWA C655-2025
Field Dechlorination
The purpose of this standard is to define the minimum procedures for field dechlorination of chlorinated water or water treated with chloramines that is to be discharged, including discharge site preparation, sampling and testing of discharge water, various methods of dechlorination, and dechlorination chemicals.
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AWWA C670-2025
Online Chlorine Analyzer Operation and Maintenance
Continuous chlorine residual monitoring is used for two primary purposes: process control and regulatory compliance. Process control implies that the reason for testing the chlorine content of water is primarily to determine how well a process is working (e.g., how consistent the chlorine residual is downstream of the mixer or contact tank, how much chlorine is consumed after disinfection, etc.), to control chlorine feed equipment, and to ensure appropriate chlorination of the final product. The efficiency of monochloramine formation may be controlled by the total chlorine residual (for regulatory reporting purposes) and free ammonia concentration to maintain an acceptable chloramine speciation. Process control may also imply analyzing residual chlorine content in distribution or transmission systems. A sudden decrease in measured chlorine residual may be indicative of malfunctioning equipment, system failure, untreated water intrusion, or introduction of some chlorine-consuming contaminants. Testing the chlorine content of water primarily for regulatory compliance often involves testing method constraints, including sample collection point, analysis methods, sample interval, and chlorine residual targets. If testing is for regulatory compliance, the authority having jurisdiction (AHJ) shall be consulted prior to purchasing an online chlorine analyzer. The purpose of this standard is to provide the minimum requirements for online chlorine analyzer O&M, sampling requirements, accuracy and precision testing requirements, range requirements, and methods of calibration and
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AWWA C671-2021
Online Turbidimeter Operation and Maintenance
This standard describes online turbidimeter operation and maintenance (O&M) for online turbidimeters used in the treatment and monitoring of potable water, reclaimed water, or wastewater effluent.
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