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Tap water quality report

Boulder City of

EPA monitoring tested this supplier for 73 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

73
contaminants tested
17
detected
1,400
people served
37
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Local government
Counties served
Jefferson

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.

37
health-based violations
376
violations on file
15
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2022-07-01
TT Health-based Resolved 2022-07-01
TT Health-based Resolved 2022-07-01
TT Health-based Resolved 2022-07-01
MCL Health-based Resolved 2006-09-01 → 2006-09-30
MCL Health-based Resolved 2006-09-01 → 2006-09-30
MCL Health-based Resolved 2006-09-01 → 2006-09-30
MCL Health-based Resolved 2006-09-01 → 2006-09-30
MCL Health-based Resolved 2006-09-01 → 2006-09-30
MCL Health-based Resolved 2006-09-01 → 2006-09-30

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
Nitrate-Nitrite
770 µg/L 7.7%
of the EPA limit 10000 µg/L
worst single sample: 1100 µg/L
46/46 SYR4 2012–2019
Copper
861.55 µg/L 66%
of the EPA limit 1300 µg/L
worst single sample: 956 µg/L
30/30 SYR4 2012–2018
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 22/22 LCR 2024
TTHM
5.65 µg/L 7.1%
of the EPA limit 80 µg/L
worst single sample: 6.9 µg/L
11/15 SYR4 2013–2019
Chloroform
2.865 µg/L
No EPA limit set
worst single sample: 3.9 µg/L
10/15 SYR4 2013–2019
Bromodichloromethane
2.05 µg/L
No EPA limit set
worst single sample: 2.2 µg/L
7/15 SYR4 2013–2019
Dichloroacetic Acid
2.45 µg/L
No EPA limit set
worst single sample: 2.6 µg/L
6/6 SYR4 2014–2019
Fluoride
200 µg/L 5%
of the EPA limit 4000 µg/L
 6/6 SYR4 2016–2019
Total Haloacetic Acids (HAA5)
3.45 µg/L 5.8%
of the EPA limit 60 µg/L
worst single sample: 3.5 µg/L
6/6 SYR4 2014–2019
Combined Uranium
6 µg/L 20%
of the EPA limit 30 µg/L
 5/5 SYR4 2013–2019
Gross Alpha, Excl. Radon And U
4.625 pCi/L 31%
of the EPA limit 15 pCi/L
worst single sample: 4.7 pCi/L
4/5 SYR4 2013–2019
Lead
1.85 µg/L 12%
of the EPA limit 15 µg/L
worst single sample: 2 µg/L
4/30 SYR4 2012–2018
Trichloroacetic Acid
1.243 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
4/6 SYR4 2014–2019
Dibromoacetic Acid
0.4970 µg/L
No EPA limit set
worst single sample: 0.5200 µg/L
3/6 SYR4 2014–2019
Dibromochloromethane
1.335 µg/L
No EPA limit set
worst single sample: 1.4 µg/L
3/15 SYR4 2013–2019
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
 2/9 SYR4 2013–2019
Gross Beta Particle Activity
2.59 pCi/L
No EPA limit set
worst single sample: 2.6 pCi/L
2/3 SYR4 2013
56 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
BULLOCK, BRIAN
Phone
406-225-3381

Frequently asked questions about Boulder City of

Is Boulder City of tap water safe to drink?

EPA monitoring detected 17 contaminants in Boulder 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 Boulder City of's water?

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

How many people does Boulder City of serve?

Boulder City of reports serving 1,400 people in Montana, per its EPA record.

Has Boulder City of had any water quality violations?

The EPA has 376 violations on file for Boulder City of, of which 37 are health-based (a contaminant limit or required treatment was breached) and 15 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.