National Toxicology Program

National Toxicology Program

Haloacetic Acids Found as Water Disinfection By-Products

Status: Topic Selected for Evaluation

  • Primary Exposures:
    • Widespread exposure to people residing in the United States.
    • More than 250 million people, with 98% of water treatment systems using some type of chlorine disinfection process.
    • The most common exposure route for disinfection by-products is ingestion of chlorinated drinking water.
    • Exposure can also occur via dermal and inhalation routes from bathing or the use of swimming pools and spas that use chlorine for disinfection.
  • Documents
    • Federal Register notice requesting public comment on nominated substances (October 7, 2015 – PDF HTML)
    • Concept Document
    • RoC Protocol
    • Draft RoC Monograph
    • Revised RoC Monograph
    • Final RoC Monograph
  • Public Comments
  • Meetings, Webinars and Listening Sessions
  • Submit additional information (such as citations or new studies, scientific issues, nomination of experts, or comments on RoC documents)

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NTP is located at the National Institute of Environmental Health Sciences, part of the National Institutes of Health.