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Chloramine in drinking water

Also called Chloramines, Chloramines (as Cl2).

Legal limit
4.0 ppm
Health goal
4.0 ppm

Values in parts per million (ppm). Forms or is added in treatment.

Where the rules stand

EPA sets a maximum residual disinfectant level (MRDL) of 4.0 ppm (4.0 mg/L as Cl2) and a goal (MRDLG) of 4 ppm. These are the disinfectant versions of an MCL and MCLG, and this data stores them in those fields.

The scale every TapBuff report uses for this contaminant: the legal line at the middle, twice it at the right.

What EPA says about health

EPA lists eye and nose irritation, stomach discomfort and anemia above the MRDL.

Where it comes from

Utilities add chloramine to control microbes, so it comes from treatment, not from the source water.

What handles it

  • NSF/ANSI 42

    Claim to look for: Chloramine Reduction

    Aesthetic claim. Chloramine is a separate claim from chlorine. WQA wording: "Aesthetic Chloramine."

Filters with that claim on a certifier’s listing

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Sources

  1. National Primary Drinking Water Regulations, U.S. EPA. Checked Oct. 4, 2026.
  2. NSF/ANSI 42, 53 and 401: Filtration Systems Standards, NSF. Checked Oct. 4, 2026.
  3. Search for NSF Certified Drinking Water Treatment Units (standards and reduction claims lists), NSF. Checked Oct. 4, 2026.
  4. Contaminant Reduction Claims Guide, NSF. Checked Oct. 4, 2026.
  5. Find WQA Certified Products (Gold Seal listings by standard and claim), Water Quality Association. Checked Oct. 4, 2026.
  6. SDWA Dataset Download Summary (codes from SDWA_REF_CODE_VALUES.csv, 2026 Q2 extract), U.S. EPA ECHO. Checked Oct. 4, 2026.