HARLEM, 08
MISSION HOUSING WATER SYSTEM Water System
Inactive system
This water system is marked inactive in EPA’s federal records as of February 1, 2012. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.
If you are a resident looking for your current water provider, see water systems in 08.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace EPA Region 8’s official records. Always confirm current status with EPA Region 8 before making decisions based on this information.
System facts
- System ID (PWSID)
- 083090043
- System type
- Community Water System
- Population served
- 170
- Service connections
- 32
- Ownership
- Native American tribal
- Water source
- groundwater (wells)
Violation history
Monitoring, Regular
—Chlordane
January 1, 2008 – December 31, 2010
ResolvedMonitoring, Regular
—Picloram
January 1, 2008 – December 31, 2010
ResolvedMonitoring, Regular
—2,3,7,8-TCDD
January 1, 2008 – December 31, 2010
ResolvedMonitoring, Regular
—Vinyl chloride
January 1, 2008 – January 1, 2010
ResolvedMonitoring, Regular
—1,1-Dichloroethylene
January 1, 2008 – January 1, 2010
ResolvedMonitoring, Regular
—1,1,1-Trichloroethane
January 1, 2008 – January 1, 2010
ResolvedMonitoring, Regular
—Toluene
January 1, 2008 – January 1, 2010
ResolvedMonitoring, Regular
—Methoxychlor
January 1, 2008 – December 31, 2010
ResolvedMonitoring, Regular
—Diquat
January 1, 2008 – December 31, 2010
ResolvedMonitoring, Regular
—Combined Radium (-226 and -228)
June 1, 1976 – May 31, 1980
ArchivedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
June 1, 1976 – May 31, 1980
Archived
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| January 1, 2008 – December 31, 2010 | Monitoring, Regular | Chlordane | — | Resolved |
| January 1, 2008 – December 31, 2010 | Monitoring, Regular | Picloram | — | Resolved |
| January 1, 2008 – December 31, 2010 | Monitoring, Regular | 2,3,7,8-TCDD | — | Resolved |
| January 1, 2008 – January 1, 2010 | Monitoring, Regular | Vinyl chloride | — | Resolved |
| January 1, 2008 – January 1, 2010 | Monitoring, Regular | 1,1-Dichloroethylene | — | Resolved |
| January 1, 2008 – January 1, 2010 | Monitoring, Regular | 1,1,1-Trichloroethane | — | Resolved |
| January 1, 2008 – January 1, 2010 | Monitoring, Regular | Toluene | — | Resolved |
| January 1, 2008 – December 31, 2010 | Monitoring, Regular | Methoxychlor | — | Resolved |
| January 1, 2008 – December 31, 2010 | Monitoring, Regular | Diquat | — | Resolved |
| June 1, 1976 – May 31, 1980 | Monitoring, Regular | Combined Radium (-226 and -228) | — | Archived |
| June 1, 1976 – May 31, 1980 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
No enforcement actions on record for this system.
Last known contact on file (system is inactive)
NICHOLSON, MARGARET
406-353-8313
HARLEM, MT 59526