Public water system record
Sphinx Mountain MB HM Pk
On record as serving Corwin Springs, Park County, MT · Serves 52 people
Federal records show no health-based violations and 1 monitoring/reporting issue for Sphinx Mountain MB HM Pk in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 1
Key facts
- Sphinx Mountain MB HM Pk draws water from 2 wells.
- Most recent formal enforcement: compliance order (no penalty) by EPA, September 2010.
- Record on file since 1993, with 6 health-based violations before October 20, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 20 service lines.
Check whether Sphinx Mountain MB HM Pk 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.
None since October 2016.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Carbofuran
Monitoring and reporting
|
Jan 1, 2020 | Resolved |
Full record since 1993
EPA's records for Sphinx Mountain MB HM Pk go back to 1993. Before October 20, 2016 they list 6 health-based violations (4 resolved, 2 archived by EPA without a recorded fix) and 12 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 4 |
| 2000s | 4 | 3 |
| 2010 to October 19, 2016 | 2 | 5 |
| 2020s | 0 | 1 |
Most recent health-based violation before October 20, 2016: Gross Alpha, Excl. Radon and U, began July 2010, Archived.
Show all 6 health-based violations before October 20, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 15.5 pCi/L, federal limit 15 pCi/L (at or just above the limit)
|
Jul 1, 2010 | Archived |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Apr 1, 2010 | Archived |
|
Arsenic
Contaminant limit exceeded
Measured 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit)
|
Apr 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit)
|
Jan 1, 2009 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Apr 1, 2006 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Oct 1, 2003 | Resolved |
Enforcement actions
Montana regulators and EPA took 2 formal enforcement actions against Sphinx Mountain MB HM Pk and issued 2 boil water orders between 2003 and 2010. The most recent was a compliance order (no penalty) in September 2010.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Sep 23, 2010 | EPA | Compliance order (no penalty) | 3 violations (2 health-based): Gross Alpha, Excl. Radon and U |
| Sep 9, 2009 | EPA | Compliance order (no penalty) | 6 violations (3 health-based): Arsenic, Lead and Copper Rule, Total Coliform |
| Apr 14, 2006 | Montana | Boil water order | 1 violation (1 health-based): Total Coliform |
| Oct 21, 2003 | Montana | Boil water order | 1 violation (1 health-based): Total Coliform |
Where the water comes from
Sphinx Mountain MB HM Pk draws water from 2 wells.
Annual water quality report
Sphinx Mountain MB HM Pk 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 Sphinx Mountain MB HM Pk 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