# Heterotrophic plate count (HPC) — Drinking water contaminant limits by regulator

For Heterotrophic plate count (HPC), regulator is US EPA (National Primary Drinking Water Regulations); limit is TT; limit type is Treatment Technique, recorded from its source on 2026-08-06.

- **Contaminant:** Heterotrophic plate count (HPC) _(verified: appears in the quote below)_
- **Regulator:** US EPA (National Primary Drinking Water Regulations) _(our reading, not quoted from the source)_
- **Limit:** TT _(verified: appears in the quote below)_
- **Limit type:** Treatment Technique _(our reading, not quoted from the source)_

## What the source says

> Heterotrophic plate count ( HPC ) | n/a | TT 3

## 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/).