Site:
Potable Water-Tank Disinfection
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Violation:
Potable water tanks #47, 77, and 79 were inspected and disinfected in June 2023. Records did not indicate the free residual halogen before the tanks were placed back into service.
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Recommendation:
Ensure the empty tank cleaning and disinfection procedure is only used for routine cleaning and disinfection It is not approved for known or suspected contaminated tanks. Ensure the following steps are followed: 1) Remove (strip) all water from the tank; 2) Clean all tank surfaces, including filling lines, with an appropriate detergent; 3) Rinse all surfaces of the tank thoroughly with potable water; 4) Remove (strip) the rinse water from the tank; 5) Wet all surfaces of the tank with at least a 200-mg/L (ppm) solution of chlorine (this can be done using new, clean mops, rollers, sprayers, etc.). Ensure the tank surfaces remain wet with the chlorine solution for at least 2 hours. Check, monitor, and document the disinfection concentration and contact time; 6) Refill the tank and verify the free residual halogen is less than or equal to 5.0 mg/L (ppm) before placing the tank back into service. Document the free residual halogen level.
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