Public water system record
City of Libby
Serves an area of Lincoln County, MT that includes Libby · 4,892 people served
Federal records show 4 health-based violations and 22 monitoring/reporting issues for City of Libby in the last ten years. The most serious issue in this window was a Interim Enhanced Surface Water Treatment Rule violation that EPA lists as archived, not resolved.
System profile
- Health-based violations, last 10 years
- 4
- Resolved
- 3
- Unresolved
- 0
- Archived by EPA
- 1
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 22
Key facts
- City of Libby draws water from 1 surface water intake and 2 reservoirs.
- Most recent formal enforcement: administrative penalty by Montana, April 2015.
- Record on file since 1992, with 15 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 3 unknown out of 2,015 service lines.
Check whether City of Libby 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 |
|---|---|---|---|---|
|
Interim Enhanced Surface Water Treatment Rule
Treatment technique failure
|
120 | Dec 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Interim Enhanced Surface Water Treatment Rule
Treatment technique failure
|
120 | Mar 1, 2022 | Resolved | Yes |
|
Long Term 2 Enhanced Surface Water Treatment Rule
Treatment technique failure
|
120 | Mar 1, 2022 | Resolved | No |
|
Interim Enhanced Surface Water Treatment Rule
Treatment technique failure
|
120 | Oct 1, 2021 | Resolved | Yes |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Styrene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Ethylbenzene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Toluene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Benzene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
CHLOROBENZENE
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Tetrachloroethylene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
1,1,2-Trichloroethane
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Trichloroethylene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
1,2-Dichloropropane
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Carbon tetrachloride
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
1,1,1-Trichloroethane
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
1,2-Dichloroethane
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
trans-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
1,1-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Vinyl chloride
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
p-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
o-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
DICHLOROMETHANE
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Xylenes, Total
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
cis-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
1,2,4-Trichlorobenzene
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2019 | Resolved |
Full record since 1992
EPA's records for City of Libby go back to 1992. Before October 19, 2016 they list 15 health-based violations (15 resolved) and 62 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 1 | 17 |
| 2000s | 0 | 42 |
| 2010 to October 18, 2016 | 14 | 3 |
| October 19, 2016 to 2019 | 0 | 1 |
| 2020s | 4 | 21 |
Most recent health-based violation before October 19, 2016: Interim Enhanced Surface Water Treatment Rule (acute), began December 2015, Resolved.
Show all 15 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Dec 1, 2015 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Mar 1, 2015 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Mar 1, 2015 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Mar 1, 2014 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Mar 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 2012 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Nov 1, 2012 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 1993 | Resolved |
Enforcement actions
Montana regulators took 4 formal enforcement actions against City of Libby between 1994 and 2015, filed as 7 records in EPA's data. The most recent was an administrative penalty in April 2015.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Apr 22, 2015 | Montana | Administrative penalty | 12 violations (12 health-based): Interim Enhanced Surface Water Treatment Rule, Surface Water Treatment Rule |
| Jul 22, 2013 | Montana | Compliance order (no penalty) | 13 violations (13 health-based): Interim Enhanced Surface Water Treatment Rule, Surface Water Treatment Rule |
| May 4, 2001 | Montana | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
| May 6, 1994 | Montana | Compliance order (no penalty) | 1 violation: Total Coliform |
What the violations mean
Interim Enhanced Surface Water Treatment Rule
3 incidentsThe system did not meet a filtration or treatment requirement for surface water
Inadequate treatment of surface water can let pathogens such as Cryptosporidium and Giardia through
Long Term 2 Enhanced Surface Water Treatment Rule
1 incidentThe system failed required surface water treatment or filtration standards
Untreated or inadequately treated surface water can contain bacteria and viruses
Where the water comes from
City of Libby draws water from 1 surface water intake and 2 reservoirs. 2 smaller public systems such as schools, businesses or campgrounds buy water from City of Libby. 1 other public water system has a seasonal connection to City of Libby.
Annual water quality report
City of Libby 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.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
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