F14/100
CHINOOK CITY OF — Water Quality Report 2026
Serving 1,300 people · Montana
Water Source
Surface Water
County
—
System ID
MT0000174
Violations
26
Contaminant Test Results
EPA Violation History
4
Violations (last 5yr)
4
Unresolved
4
Health-Related
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2025 – December 31, 2025Rule: Stage 2 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: July 1, 2025 – September 30, 2025Rule: Stage 2 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: April 1, 2025 – June 30, 2025Rule: Stage 2 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: January 1, 2025 – March 31, 2025Rule: Stage 2 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
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 CHINOOK CITY OF
Is CHINOOK CITY OF water safe to drink?
CHINOOK CITY OF water receives a grade of F (14/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 26 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CHINOOK CITY OF detected?
1 contaminants were tested in CHINOOK CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CHINOOK CITY OF have any EPA violations?
Yes, CHINOOK CITY OF has 26 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, MR, TT. 15 are health-based violations.
How many people does CHINOOK CITY OF serve?
CHINOOK CITY OF serves approximately 1,300 people, Montana. The system provides water to 1 community: Chinook.
What type of water does CHINOOK CITY OF provide?
CHINOOK CITY OF sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is MT0000174.
How does CHINOOK CITY OF compare to other utilities in Montana?
CHINOOK CITY OF scores 14/100 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.