# Chlorine dioxide (as ClO2) — Drinking water contaminant limits by regulator

For Chlorine dioxide (as ClO2), regulator is US EPA (National Primary Drinking Water Regulations); limit is MRDL=0.8; unit is mg/L; limit type is MRDL (Maximum Residual Disinfectant Level), recorded from its source on 2026-08-06.

- **Contaminant:** Chlorine dioxide (as ClO2) _(verified: appears in the quote below)_
- **Regulator:** US EPA (National Primary Drinking Water Regulations) _(our reading, not quoted from the source)_
- **Limit:** MRDL=0.8 _(verified: appears in the quote below)_
- **Unit:** mg/L
- **Limit type:** MRDL (Maximum Residual Disinfectant Level) _(our reading, not quoted from the source)_

## What the source says

> Chlorine dioxide (as ClO 2 ) | MRDLG =0.8 1 | MRDL =0.8 1

## Source

- https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations

Last verified: 2026-08-06. Review by: 2027-08-06.
Part of [Drinking water contaminant limits by regulator](https://referencesource.org/drinking-water-contaminant-limits/).