Disinfection Rules

Public Water Systems that add a disinfectant to their water or serve disinfected water are subject to the monitoring and reporting requirements of the Long Term 2 Enhanced Surface Water Treatment Rule and the Stage 2 Disinfection Byproducts Rule. This includes consecutive connection systems that serve water treated with a disinfectant, regardless of whether the consecutive system uses additional disinfectant.

Monitoring Requirements

  1. Disinfection Byproduct (DBP) Sampling
    • Community and Non-Transient Non-Community systems that add a disinfectant or serve water treated with a chemical disinfectant must sample DBPs according to the system’s monitoring requirements listed on WaterLink.utah.gov.
  2. Chlorine Residual Sampling in the Distribution System
    • All public water systems that add a disinfectant or serve water treated with a chemical disinfectant must sample chlorine residuals in the distribution system a minimum of 3 times per week for a total of 12 times per month. Chlorine residuals should be taken with each bacteriological sample.
    • Systems that take more than 12 bacteriological samples per month should sample chlorine residuals on the same frequency as the bacteriological schedule.
  3. Chlorine Residual Sampling at the Point of Entry
    • All public water systems that add a disinfectant must sample chlorine residuals at the point of entry to the distribution system (after the chlorinator and before the first customer) according to each system’s monitoring schedule listed on WaterLink.utah.gov and record these residuals in the operational disinfection report described below.
  4. Operational Disinfection Report(rotometer/pump settings, volume of water treated, etc)
    • As part of the Operational Disinfection Report, all public water systems that add a disinfectant must record and report chlorine residuals taken at the point of entry. They must also record and report operational data, including rotometer or pump settings, the amount of chlorine used per day, the volume of water treated, etc.
    • Consecutive connection systems that receive water treated with a disinfectant but do not add a disinfectant are not required to submit Operational Disinfection Reports to the Division of Drinking Water (DDW), but they must report chlorine residuals measured in the distribution system as detailed above.

Reporting Requirements

Systems must ensure that treatment reporting data is submitted to the DDW by the 10th day following the end of each quarter: January 10th, April 10th, July 10th, and October 10th. Systems that are required to sample DBPs annually or once every three years should complete sampling by the end of August unless otherwise noted on the system’s monitoring schedule on WaterLink.utah.gov.

  1. The lab should send DBP results directly to the DDW. Copies of the lab reports may be sent to DDWREPORTS@utah.gov.
  2. Report distribution system chlorine residual averages at MRDL.utah.gov.
  3. Use the Operational Disinfection Spreadsheet template provided in the section below and email the report to DDWREPORTS@utah.gov.

Resources

Chlorine Reporting

Handouts and Reference Guides

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