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F17/100

RIVER ROCK COUNTY WATER AND SEWER DIST — Water Quality Report 2026

Serving 4,200 people · Montana

Water Source
Groundwater
County
—
System ID
MT0004082
Violations
56

Contaminant Test Results

1 contaminant above EPA health goals
ContaminantDetectedLimit (MCL)Status
Lead (90th percentile)
0.003 mg/L0.015 mg/LAbove Goal

EPA Violation History

6

Violations (last 5yr)

0

Unresolved

0

Health-Related

TIER 3Resolved

Failed to issue ongoing public notification

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2024 – September 25, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2023 – October 18, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2023 – October 18, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring / Reporting Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: December 30, 2021 – October 29, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway

Understanding violation severity

Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.

Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly

Frequently Asked Questions About RIVER ROCK COUNTY WATER AND SEWER DIST

Is RIVER ROCK COUNTY WATER AND SEWER DIST water safe to drink?

RIVER ROCK COUNTY WATER AND SEWER DIST water receives a grade of F (17/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 56 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has RIVER ROCK COUNTY WATER AND SEWER DIST detected?

31 contaminants were tested in RIVER ROCK COUNTY WATER AND SEWER DIST's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).

Does RIVER ROCK COUNTY WATER AND SEWER DIST have any EPA violations?

Yes, RIVER ROCK COUNTY WATER AND SEWER DIST has 56 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, Other, MCL. 6 are health-based violations.

How many people does RIVER ROCK COUNTY WATER AND SEWER DIST serve?

RIVER ROCK COUNTY WATER AND SEWER DIST serves approximately 4,200 people, Montana. The system provides water to 1 community: Belgrade.

What type of water does RIVER ROCK COUNTY WATER AND SEWER DIST provide?

RIVER ROCK COUNTY WATER AND SEWER DIST sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MT0004082.

How does RIVER ROCK COUNTY WATER AND SEWER DIST compare to other utilities in Montana?

RIVER ROCK COUNTY WATER AND SEWER DIST scores 17/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Montana state page for a full comparison of water systems.

Cities Served

Belgrade