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Tap water quality report

Libby City of

EPA monitoring tested this supplier for 105 contaminants and detected 14. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

105
contaminants tested
14
detected
4,892
people served
103
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Surface water
Ownership
Local government
Counties served
Lincoln

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

103
health-based violations
331
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2025-12-01 → 2025-12-31
TT Health-based Resolved 2025-12-01 → 2025-12-31
TT Health-based Resolved 2025-12-01 → 2025-12-31
TT Health-based Resolved 2022-03-01 → 2022-03-31
TT Health-based Resolved 2022-03-01 → 2022-03-31
TT Health-based Resolved 2022-03-01 → 2022-03-31
TT Health-based Resolved 2022-03-01 → 2022-03-31
TT Health-based Resolved 2022-03-01 → 2022-03-31
TT Health-based Resolved 2022-03-01 → 2022-03-31
TT Health-based Resolved 2021-10-01 → 2021-10-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
320 µg/L 25%
of the EPA limit 1300 µg/L
worst single sample: 1020 µg/L
56/60 SYR4 2013–2019
Chloroform
22.65 µg/L
No EPA limit set
worst single sample: 46 µg/L
28/28 SYR4 2012–2019
TTHM
23.65 µg/L 30%
of the EPA limit 80 µg/L
worst single sample: 47 µg/L
28/28 SYR4 2012–2019
Bromodichloromethane
1.17 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
24/28 SYR4 2012–2019
Lead
6.55 µg/L 44%
of the EPA limit 15 µg/L
worst single sample: 857 µg/L
24/60 SYR4 2013–2019
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 21/21 LCR 2025
Dichloroacetic Acid
10.05 µg/L
No EPA limit set
worst single sample: 11 µg/L
20/20 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
27.1 µg/L 45%
of the EPA limit 60 µg/L
worst single sample: 29 µg/L
20/20 SYR4 2012–2019
Trichloroacetic Acid
17 µg/L
No EPA limit set
 20/20 SYR4 2012–2019
Nitrate-Nitrite
46.5 µg/L 0.5%
of the EPA limit 10000 µg/L
worst single sample: 50 µg/L
8/9 SYR4 2012–2019
Monochloroacetic Acid
1.55 µg/L
No EPA limit set
worst single sample: 1.6 µg/L
6/20 SYR4 2012–2019
Nitrate
30 µg/L 0.3%
of the EPA limit 10000 µg/L
 2/2 SYR4 2013
Fluoride
20 µg/L 0.5%
of the EPA limit 4000 µg/L
 1/1 SYR4 2013
Gross Alpha, Excl. Radon And U
2.1 pCi/L 14%
of the EPA limit 15 pCi/L
 1/1 SYR4 2013
91 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
SIKES, SAMUEL
Phone
406-293-2731

Frequently asked questions about Libby City of

Is Libby City of tap water safe to drink?

EPA monitoring detected 14 contaminants in Libby City of's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Libby City of's water?

EPA monitoring detected Copper, Chloroform, TTHM, Bromodichloromethane, Lead, and others. The full list with the level and data source for each is above.

How many people does Libby City of serve?

Libby City of reports serving 4,892 people in Montana, per its EPA record.

Has Libby City of had any water quality violations?

The EPA has 331 violations on file for Libby City of, of which 103 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.