Tap WaterIndex

← Montana

Tap water quality report

Billings City of

EPA monitoring tested this supplier for 105 contaminants and detected 20. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

105
contaminants tested
20
detected
114,000
people served
0
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Surface water
Ownership
Local government
Counties served
Yellowstone

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.

0
health-based violations
4
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 1998-11-01 → 1998-11-30
MR Monitoring Resolved 1998-08-01 → 1998-08-31
MR Monitoring Resolved 1998-07-01 → 1998-07-31
MR Monitoring Resolved 1993-08-01 → 1993-08-31

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
TTHM
70.8 µg/L 89%
of the EPA limit 80 µg/L
worst single sample: 85 µg/L
269/270 SYR4 2012–2019
Chloroform
58 µg/L
No EPA limit set
worst single sample: 77.1 µg/L
268/269 SYR4 2012–2019
Bromodichloromethane
12 µg/L
No EPA limit set
worst single sample: 14 µg/L
267/269 SYR4 2012–2019
Dichloroacetic Acid
23.925 µg/L
No EPA limit set
worst single sample: 37 µg/L
264/264 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
60.94 µg/L 102%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
worst single sample: 77 µg/L
264/264 SYR4 2012–2019
Trichloroacetic Acid
35.85 µg/L
No EPA limit set
worst single sample: 48.1 µg/L
264/264 SYR4 2012–2019
Dibromochloromethane
3.2 µg/L
No EPA limit set
worst single sample: 5.5 µg/L
222/270 SYR4 2012–2019
Monochloroacetic Acid
2.5 µg/L
No EPA limit set
worst single sample: 5.4 µg/L
139/264 SYR4 2012–2019
Copper
282.1 µg/L 22%
of the EPA limit 1300 µg/L
worst single sample: 457 µg/L
138/142 SYR4 2013–2017
Dibromoacetic Acid
0.7970 µg/L
No EPA limit set
worst single sample: 0.8500 µg/L
104/264 SYR4 2012–2019
Lead
10.4 µg/L 69%
of the EPA limit 15 µg/L
worst single sample: 87 µg/L
84/142 SYR4 2013–2017
Arsenic
7 µg/L 70%
of the EPA limit 10 µg/L
worst single sample: 9 µg/L
42/42 SYR4 2012–2019
Monobromoacetic Acid
1.125 µg/L
No EPA limit set
worst single sample: 1.2 µg/L
16/264 SYR4 2012–2019
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2023
Fluoride
550 µg/L 14%
of the EPA limit 4000 µg/L
worst single sample: 600 µg/L
11/11 SYR4 2012–2019
Nitrate-Nitrite
593 µg/L 5.9%
of the EPA limit 10000 µg/L
worst single sample: 620 µg/L
10/10 SYR4 2012–2019
Lithium
57 µg/L
No EPA limit set
 4/4 UCMR-5 2023
Barium
59.5 µg/L 3%
of the EPA limit 2000 µg/L
worst single sample: 60 µg/L
2/12 SYR4 2012–2019
Nitrate
390 µg/L 3.9%
of the EPA limit 10000 µg/L
 2/2 SYR4 2019
Selenium
1 µg/L 2%
of the EPA limit 50 µg/L
 2/11 SYR4 2012–2019
85 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEndrinEthylbenzeneGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ENGELS, LOUIS W
Phone
406-657-8349
Email
[email protected]

Frequently asked questions about Billings City of

Is Billings City of tap water safe to drink?

EPA monitoring detected 20 contaminants in Billings 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 Billings City of'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 Billings City of serve?

Billings City of reports serving 114,000 people in Montana, per its EPA record.

Has Billings City of had any water quality violations?

The EPA has 4 violations on file for Billings City of, of which 0 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.