LIBBY CITY OF
PWSID: MT0000274 · Libby, MT · Serves 4,892 people
According to EPA Safe Drinking Water Information System (SDWIS), LIBBY CITY OF (PWSID MT0000274) in Libby, MT is listed as a CWS water system covering about 4,892 people. The same extract lists 13 health-based violation records spanning 1993-2025. Those 13 health-based rows for LIBBY CITY OF cover contaminants such as Interim Enhanced Surface Water Treatment Rule, Long Term 2 Enhanced Surface Water Treatment Rule, Surface Water Treatment Rule; they remain historical EPA registry entries, not a current compliance or drinkability score.
LIBBY CITY OF has 13 health-based violation records in this historical extract. Monitoring and reporting records are not included.
PlainEnviro's health-based SDWIS extract covers monitoring and reporting violations only -- it does not include unresolved enforcement actions in progress or corrective steps a utility has taken since the extract date. 3 distinct EPA contaminant codes appear in this system's record, including Interim Enhanced Surface Water Treatment Rule, Long Term 2 Enhanced Surface Water Treatment Rule, Surface Water Treatment Rule. Recorded violations span 1993–2025. Day-to-day primacy enforcement for this system runs through the Montana drinking-water program, not EPA directly.
A historical health-based record does not necessarily describe current water quality or compliance. The most authoritative current source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the Montana state drinking-water program's public portal.
System Details
- EPA ID (PWSID)
- MT0000274
- System Type
- CWS
- Water Source
- Surface Water
- Location
- Libby, MT
- Population Served
- 4,892
- Health Violations
- Yes (13)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Interim Enhanced Surface Water Treatment Rule | 9 | 9 |
| Long Term 2 Enhanced Surface Water Treatment Rule | 3 | 3 |
| Surface Water Treatment Rule | 1 | 1 |
Violation History (13)
| Contaminant | Health | Date |
|---|---|---|
| Interim Enhanced Surface Water Treatment Rule | Yes | Dec 1, 2025 |
| Long Term 2 Enhanced Surface Water Treatment Rule | Yes | Mar 1, 2022 |
| Long Term 2 Enhanced Surface Water Treatment Rule | Yes | Mar 1, 2022 |
| Long Term 2 Enhanced Surface Water Treatment Rule | Yes | Mar 1, 2022 |
| Interim Enhanced Surface Water Treatment Rule | Yes | Mar 1, 2022 |
| Interim Enhanced Surface Water Treatment Rule | Yes | Mar 1, 2022 |
| Interim Enhanced Surface Water Treatment Rule | Yes | Mar 1, 2022 |
| Interim Enhanced Surface Water Treatment Rule | Yes | Oct 1, 2021 |
| Interim Enhanced Surface Water Treatment Rule | Yes | Oct 1, 2021 |
| Interim Enhanced Surface Water Treatment Rule | Yes | Oct 1, 2021 |
| Interim Enhanced Surface Water Treatment Rule | Yes | Dec 1, 2015 |
| Interim Enhanced Surface Water Treatment Rule | Yes | Dec 1, 2015 |
| Surface Water Treatment Rule | Yes | Jan 1, 1993 |
Frequently Asked Questions
What does EPA SDWIS list for LIBBY CITY OF?
How many people does LIBBY CITY OF serve?
What violations does LIBBY CITY OF have?
What contaminants have been found in LIBBY CITY OF water?
Compare beyond Montana
Nationwide peers by violations & population served
Cross-state SDWIS systems nearest LIBBY CITY OF on cumulative violation count (13) and EPA-reported population served (4,892). Violation-count peers include SCUA Lower Peridot, Cocopah Bend RV & Golf Resort, BETHEL HEIGHTS WATER SYSTEM. Population peers include WEST MILTON VILLAGE PWS, ELDON PWS, CHINA GROVE, TOWN OF.
Similar violation count
Nearest cross-state community systems (500+ served) by SDWIS violations on record.
Similar population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ gate).
Nearby Water Systems
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About This Data
LIBBY CITY OF (MT0000274) is drawn from EPA SDWIS. Nearby county systems in this extract include TROY CITY OF; EUREKA TOWN OF; INDIAN SPRINGS RANCH SUB; WILDERNESS CLUB THE. Health-based rows (13 MCL/TT) are historical registry state, not a current drinkability score.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.