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Tap water quality report

Butte Silverbow Water Dept

EPA monitoring tested this supplier for 102 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

102
contaminants tested
17
detected
33,000
people served
17
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Surface water
Ownership
Local government
Counties served
Silver Bow

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.

17
health-based violations
331
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2012-04-24
TT Health-based Resolved 2012-04-24
TT Health-based Resolved 2012-04-24
TT Health-based Resolved 2012-04-24
TT Health-based Resolved 2012-04-24
TT Health-based Resolved 2012-04-24
MCL Health-based Resolved 2011-04-01 → 2011-06-30
MCL Health-based Resolved 2011-04-01 → 2011-06-30
MCL Health-based Resolved 2011-04-01 → 2011-06-30
MCL Health-based Resolved 2011-04-01 → 2011-06-30

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
TTHM
43.6 µg/L 55%
of the EPA limit 80 µg/L
worst single sample: 60 µg/L
329/332 SYR4 2012–2019
Chloroform
40 µg/L
No EPA limit set
worst single sample: 58 µg/L
328/332 SYR4 2012–2019
Bromodichloromethane
3.895 µg/L
No EPA limit set
worst single sample: 5.1 µg/L
322/332 SYR4 2012–2019
Dichloroacetic Acid
22 µg/L
No EPA limit set
worst single sample: 28 µg/L
308/308 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
55 µg/L 92%
of the EPA limit 60 µg/L
worst single sample: 71 µg/L
308/308 SYR4 2012–2019
Trichloroacetic Acid
32 µg/L
No EPA limit set
worst single sample: 42 µg/L
308/308 SYR4 2012–2019
Copper
686.5 µg/L 53%
of the EPA limit 1300 µg/L
worst single sample: 968 µg/L
186/187 SYR4 2013–2018
Lead
7.978 µg/L 53%
of the EPA limit 15 µg/L
worst single sample: 72 µg/L
149/187 SYR4 2013–2018
Monochloroacetic Acid
2.2 µg/L
No EPA limit set
worst single sample: 3.4 µg/L
137/308 SYR4 2012–2019
Fluoride
124.15 µg/L 3.1%
of the EPA limit 4000 µg/L
worst single sample: 146 µg/L
48/50 SYR4 2012–2017
Nitrate-Nitrite
100 µg/L 1%
of the EPA limit 10000 µg/L
worst single sample: 130 µg/L
46/48 SYR4 2012–2019
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 24/24 LCR 2024
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
 4/24 SYR4 2012–2019
Dibromoacetic Acid
0.4660 µg/L
No EPA limit set
worst single sample: 0.4900 µg/L
4/308 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
1.4 pCi/L 9.3%
of the EPA limit 15 pCi/L
 1/3 SYR4 2017
Selenium
2 µg/L 4%
of the EPA limit 50 µg/L
 1/2 SYR4 2012
Tetrachloroethylene
0.7500 µg/L 15%
of the EPA limit 5 µg/L
 1/28 SYR4 2012–2019
85 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, TotalAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
NEARY, MARK
Phone
406-497-6519
Email
[email protected]

Frequently asked questions about Butte Silverbow Water Dept

Is Butte Silverbow Water Dept tap water safe to drink?

EPA monitoring detected 17 contaminants in Butte Silverbow Water Dept'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 Butte Silverbow Water Dept's water?

EPA monitoring detected TTHM, Chloroform, Bromodichloromethane, Dichloroacetic Acid, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Butte Silverbow Water Dept serve?

Butte Silverbow Water Dept reports serving 33,000 people in Montana, per its EPA record.

Has Butte Silverbow Water Dept had any water quality violations?

The EPA has 331 violations on file for Butte Silverbow Water Dept, of which 17 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.