Does Chinook, MT tap water have any EPA-reported violations?

As of June 2026, EPA SDWIS records show 16 violation(s) across the community water systems serving Chinook, of which 11 are classified by the EPA as health-based. Most older violations have returned to compliance; see the per-system list.

Where does Chinook, MT tap water come from?

Chinook is served by 2 active community water system(s). Their primary sources, per EPA records, are: surface water.

MT / Chinook

MT · Tap water records

Chinook tap water, in plain English

Here is what the EPA's own data shows about tap water in Chinook. According to EPA SDWIS data retrieved June 2026, Chinook is served by 2 active community water systems, together reported to serve about 1,400 people.

As of June 2026, EPA records show 16 violations across the community water system(s) serving Chinook, going back to the earliest EPA record. 11 of these are classified by the EPA as health-based (a contaminant recorded above the limit the EPA tracks); the rest are monitoring or reporting violations. Each is listed by system below, with its status.

2

Community water systems
~1,400

People served (EPA-reported)
June 2026

EPA records reviewed through

What the EPA has on record, by system

Chinook City Of

1,300 served · surface water · PWSID MT0000174

Health-based Total Haloacetic Acids (HAA5): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 11 times between January 2025 and October 2025. The EPA record lists a level of 0.071 MG/L; the limit (MCL) is 0.06 MG/L. EPA records do not show all of these as returned to compliance.

Perrys Water Service

100 served · surface water · PWSID MT0004869

Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 5 times between July 2020 and July 2023. All have since returned to compliance, per EPA records.

What this means

A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.

This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.

Source: U.S. EPA Envirofacts SDWIS, retrieved June 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.