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Tap water quality report

Shelby City of

EPA monitoring tested this supplier for 97 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

97
contaminants tested
8
detected
3,970
people served
20
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Local government
Counties served
Toole

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.

20
health-based violations
60
violations on file
1
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2012-09-01 → 2012-09-30
MCL Health-based Resolved 2012-09-01 → 2012-09-30
MCL Health-based Resolved 2012-09-01 → 2012-09-30
MCL Health-based Resolved 2012-09-01 → 2012-09-30
MCL Health-based Resolved 2012-09-01 → 2012-09-30
MCL Health-based Resolved 2002-07-01 → 2002-07-31
MCL Health-based Resolved 2002-07-01 → 2002-07-31
MCL Health-based Resolved 2002-07-01 → 2002-07-31
MCL Health-based Resolved 2002-07-01 → 2002-07-31
MCL Health-based Resolved 2002-06-01 → 2002-06-30

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
251.65 µg/L 19%
of the EPA limit 1300 µg/L
worst single sample: 413 µg/L
30/30 SYR4 2014–2017
Nitrate-Nitrite
60 µg/L 0.6%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2025
Lead
4.7 µg/L 31%
of the EPA limit 15 µg/L
worst single sample: 5 µg/L
4/30 SYR4 2014–2017
Fluoride
200 µg/L 5%
of the EPA limit 4000 µg/L
 3/3 SYR4 2013–2017
Lithium
12 µg/L
No EPA limit set
 2/2 UCMR-5 2024
Combined Radium (-226 And -228)
1.9 pCi/L 38%
of the EPA limit 5 pCi/L
 1/1 SYR4 2017
Combined Uranium
1 µg/L 3.3%
of the EPA limit 30 µg/L
 1/1 SYR4 2017
89 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 TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MCDERMOTT, GARY
Phone
406-434-5222

Frequently asked questions about Shelby City of

Is Shelby City of tap water safe to drink?

EPA monitoring detected 8 contaminants in Shelby 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 Shelby City of's water?

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

How many people does Shelby City of serve?

Shelby City of reports serving 3,970 people in Montana, per its EPA record.

Has Shelby City of had any water quality violations?

The EPA has 60 violations on file for Shelby City of, of which 20 are health-based (a contaminant limit or required treatment was breached) and 1 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.