C56/100
HARLOWTON CITY OF — Water Quality Report 2026
Serving 1,050 people · Montana
Water Source
Purchased Groundwater
County
—
System ID
MT0000240
Violations
37
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
5
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2025 – July 18, 2025Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: October 1, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2024 – July 18, 2025Enforcement: Resolving — corrective action underway
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: June 1, 2024 – June 30, 2024Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2023 – July 18, 2023Enforcement: 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 HARLOWTON CITY OF
Is HARLOWTON CITY OF water safe to drink?
HARLOWTON CITY OF water receives a grade of C (56/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 37 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has HARLOWTON CITY OF detected?
1 contaminants were tested in HARLOWTON CITY OF's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does HARLOWTON CITY OF have any EPA violations?
Yes, HARLOWTON CITY OF has 37 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MON, MR. 1 are health-based violations.
How many people does HARLOWTON CITY OF serve?
HARLOWTON CITY OF serves approximately 1,050 people, Montana. The system provides water to 1 community: Harlowton.
What type of water does HARLOWTON CITY OF provide?
HARLOWTON CITY OF sources its water from purchased groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MT0000240.
How does HARLOWTON CITY OF compare to other utilities in Montana?
HARLOWTON CITY OF scores 56/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Montana state page for a full comparison of water systems.