Tap WaterIndex

← Montana

Tap water quality report

Lewistown City of

EPA monitoring tested this supplier for 97 contaminants and detected 5. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

97
contaminants tested
5
detected
5,923
people served
117
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Local government
Counties served
Fergus

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.

117
health-based violations
512
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2016-03-01 → 2016-03-31
MCL Health-based Resolved 2016-03-01 → 2016-03-31
MCL Health-based Resolved 2016-03-01 → 2016-03-31
MCL Health-based Resolved 2016-03-01 → 2016-03-31
MCL Health-based Resolved 2016-03-01 → 2016-03-31
MCL Health-based Resolved 2016-03-01 → 2016-03-31
MCL Health-based Resolved 2015-12-01 → 2015-12-31
MCL Health-based Resolved 2015-12-01 → 2015-12-31
MCL Health-based Resolved 2015-12-01 → 2015-12-31
MCL Health-based Resolved 2015-12-01 → 2015-12-31

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
91.6 µg/L 7%
of the EPA limit 1300 µg/L
worst single sample: 112 µg/L
60/60 SYR4 2013–2019
Nitrate-Nitrite
190 µg/L 1.9%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2025
Lead
1.9 µg/L 13%
of the EPA limit 15 µg/L
worst single sample: 2 µg/L
3/60 SYR4 2013–2019
Fluoride
595 µg/L 15%
of the EPA limit 4000 µg/L
worst single sample: 600 µg/L
2/2 SYR4 2012–2017
92 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, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
PHELPS, HOLLY.
Phone
406-535-1770

Frequently asked questions about Lewistown City of

Is Lewistown City of tap water safe to drink?

EPA monitoring detected 5 contaminants in Lewistown 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 Lewistown City of's water?

EPA monitoring detected Copper, Nitrate-Nitrite, Lead, Lead, Fluoride. The full list with the level and data source for each is above.

How many people does Lewistown City of serve?

Lewistown City of reports serving 5,923 people in Montana, per its EPA record.

Has Lewistown City of had any water quality violations?

The EPA has 512 violations on file for Lewistown City of, of which 117 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.