Public water system record
Granite Park Water Association
Serves an area of Yellowstone County, MT that includes Billings · 250 people served
Federal records show 1 health-based violation and 7 monitoring/reporting issues for Granite Park Water Association in the last ten years. The most serious issue in this window was a Nitrate-Nitrite violation that EPA lists as archived, not resolved.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 0
- Unresolved
- 0
- Archived by EPA
- 1
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 7
Key facts
- Granite Park Water Association draws water from 3 wells.
- Most recent formal enforcement: compliance order (no penalty) by Montana, January 2026.
- Record on file since 2008, with 0 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 120 service lines.
Check whether Granite Park Water Association serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Nitrate-Nitrite
Contaminant limit exceeded
|
330 | Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2023 | Resolved |
|
Nitrate-Nitrite
Monitoring and reporting
|
Apr 1, 2023 | Resolved |
|
E. coli
Monitoring and reporting
|
Sep 7, 2020 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Sep 1, 2018 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Sep 1, 2018 | Resolved |
|
E. coli
Monitoring and reporting
|
Nov 3, 2016 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 30, 2014 | Resolved |
Full record since 2008
EPA's records for Granite Park Water Association go back to 2008. Before October 19, 2016 they list no health-based violations and 9 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 2000s | 0 | 6 |
| 2010 to October 18, 2016 | 0 | 3 |
| October 19, 2016 to 2019 | 0 | 3 |
| 2020s | 1 | 3 |
Enforcement actions
Montana regulators took 1 formal enforcement action against Granite Park Water Association in 2026. The most recent was a compliance order (no penalty) in January 2026.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Jan 8, 2026 | Montana | Compliance order (no penalty) | 1 violation (1 health-based): Nitrate-Nitrite |
What the violations mean
Nitrate-Nitrite
1 incidentTest results for Nitrate-Nitrite were above the federal limit (a maximum contaminant level violation).
The utility had to notify customers about this violation.
Where the water comes from
Granite Park Water Association draws water from 3 wells.
Annual water quality report
Granite Park Water Association must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Granite Park Water Association for a copy.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Montana.
Certified drinking water labs by state EPA guidance for private wells