# 3,3'-Dichlorobenzidine (P) — EPA national recommended water quality criteria for human health: pollutant concentration thresholds

For 3,3'-Dichlorobenzidine (P), cas registry number is 91941; water + organism criterion (µg/l) is 0.049; organism only criterion (µg/l) is 0.15, verified against its source on 2026-08-17.

- **Pollutant name:** 3,3'-Dichlorobenzidine (P) _(verified: appears in the quote below)_
- **CAS Registry Number:** 91941 _(verified: appears in the quote below)_
- **Water + Organism criterion (µg/L):** 0.049 _(verified: appears in the quote below)_
- **Organism Only criterion (µg/L):** 0.15 _(verified: appears in the quote below)_

## What the source says

> 3,3'-Dichlorobenzidine (P) | 91941 | 0.049 | 0.15 | 2015

## Source

- https://www.epa.gov/wqc/national-recommended-water-quality-criteria-human-health-criteria-table

Last verified: 2026-08-17. Review by: 2028-08-16.
Part of [EPA national recommended water quality criteria for human health: pollutant concentration thresholds](https://referencesource.org/epa-water-quality-criteria-human-health/).