F0/100
LEWISTOWN CITY OF — Water Quality Report 2026
Serving 5,923 people · Montana
Water Source
Groundwater
County
—
System ID
MT0000271
Violations
161
Contaminant Test Results
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2025 – July 17, 2025Enforcement: 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 LEWISTOWN CITY OF
Is LEWISTOWN CITY OF water safe to drink?
LEWISTOWN CITY OF water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 161 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has LEWISTOWN CITY OF detected?
31 contaminants were tested in LEWISTOWN CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does LEWISTOWN CITY OF have any EPA violations?
Yes, LEWISTOWN CITY OF has 161 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, MCL. 24 are health-based violations.
How many people does LEWISTOWN CITY OF serve?
LEWISTOWN CITY OF serves approximately 5,923 people, Montana. The system provides water to 1 community: Lewistown.
What type of water does LEWISTOWN CITY OF provide?
LEWISTOWN CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MT0000271.
How does LEWISTOWN CITY OF compare to other utilities in Montana?
LEWISTOWN CITY OF scores 0/100 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.