FORT BELKNAP AGENCY WATER SYSTEM, MT Water Quality

FORT BELKNAP AGENCY WATER SYSTEM: EPA violation history, explained

FORT BELKNAP AGENCY WATER SYSTEM had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. Population served: 2,600, over 461 connections.

Ranked against every other system in this dataset

264 total violations and 139 health-based ones put FORT BELKNAP AGENCY WATER SYSTEM at the 100th percentile nationally for violation burden, rank 36 of 12,903.

How FORT BELKNAP AGENCY WATER SYSTEM compares within MT

Among the 59 MT systems in this dataset, the average is 6.7 health-based violations - FORT BELKNAP AGENCY WATER SYSTEM's 139 is above that. See the lead and copper guide for why lead counts differently.

Most recent violation on record

The last violation EPA has on record for FORT BELKNAP AGENCY WATER SYSTEM is from 2026-01-01 (health-based: 2026-01-01). Last reported to EPA: 06/29/2026.

What kind of problem, specifically

FORT BELKNAP AGENCY WATER SYSTEM's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:

Microbial contamination / treatment technique - flagged from: Coliform (TCR); Interim Enhanced Surface Water Treatment Rule; Surface Water Treatment Rule
Synthetic organic chemicals / pesticides / VOCs - flagged from: CARBON, TOTAL
Disinfection byproducts - flagged from: TTHM; Total Haloacetic Acids (HAA5)

The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.

What this data is and is not

This is what FORT BELKNAP AGENCY WATER SYSTEM reported to its state primacy agency and EPA under the Safe Drinking Water Act - real regulatory record, not a lab test of your specific tap. This record - 139 health-based violations on file for FORT BELKNAP AGENCY WATER SYSTEM - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.