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Tap water quality report

Dillon City of

EPA monitoring tested this supplier for 103 contaminants and detected 20. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

103
contaminants tested
20
detected
4,300
people served
0
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Local government
Counties served
Beaverhead

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
14
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2012-05-01 → 2012-05-31
MR Monitoring Resolved 2012-05-01 → 2012-05-31
MR Monitoring Resolved 2012-05-01 → 2012-05-31
MR Monitoring Resolved 2011-11-01 → 2011-11-30
MR Monitoring Resolved 2011-11-01 → 2011-11-30
MR Monitoring Resolved 2011-11-01 → 2011-11-30
MR Monitoring Resolved 2005-11-01 → 2005-11-30
MR Monitoring Resolved 2005-11-01 → 2005-11-30
MR Monitoring Resolved 2005-11-01 → 2005-11-30
MR Monitoring Resolved 2005-11-01 → 2005-11-30

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
764.8 µg/L 59%
of the EPA limit 1300 µg/L
worst single sample: 2090 µg/L
60/60 SYR4 2012–2018
Nitrate-Nitrite
2330 µg/L 23%
of the EPA limit 10000 µg/L
worst single sample: 2560 µg/L
48/48 SYR4 2012–2019
Lead
3.05 µg/L 20%
of the EPA limit 15 µg/L
worst single sample: 5 µg/L
40/60 SYR4 2012–2018
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
 21/21 LCR 2024
TTHM
15.7 µg/L 20%
of the EPA limit 80 µg/L
worst single sample: 19 µg/L
12/19 SYR4 2012–2019
Dibromochloromethane
7.35 µg/L
No EPA limit set
worst single sample: 8.8 µg/L
11/19 SYR4 2012–2019
Dibromoacetic Acid
2.965 µg/L
No EPA limit set
worst single sample: 3.1 µg/L
10/10 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
3.515 µg/L 5.9%
of the EPA limit 60 µg/L
worst single sample: 4.1 µg/L
10/10 SYR4 2012–2019
Arsenic
6 µg/L 60%
of the EPA limit 10 µg/L
 9/9 SYR4 2012–2019
Bromodichloromethane
3.28 µg/L
No EPA limit set
worst single sample: 3.6 µg/L
9/19 SYR4 2012–2019
Bromoform
5.5 µg/L
No EPA limit set
worst single sample: 6.5 µg/L
9/19 SYR4 2012–2019
Fluoride
560 µg/L 14%
of the EPA limit 4000 µg/L
worst single sample: 600 µg/L
9/9 SYR4 2012–2019
Selenium
4.5 µg/L 9%
of the EPA limit 50 µg/L
worst single sample: 5 µg/L
6/9 SYR4 2012–2019
Lithium
21 µg/L
No EPA limit set
 6/6 UCMR-5 2024
Chloroform
0.9090 µg/L
No EPA limit set
worst single sample: 0.9300 µg/L
3/19 SYR4 2012–2019
Combined Uranium
5 µg/L 17%
of the EPA limit 30 µg/L
 3/3 SYR4 2014
Gross Alpha, Excl. Radon And U
5.24 pCi/L 35%
of the EPA limit 15 pCi/L
worst single sample: 5.3 pCi/L
3/3 SYR4 2014
Combined Radium (-226 And -228)
0.8900 pCi/L 18%
of the EPA limit 5 pCi/L
worst single sample: 0.9000 pCi/L
2/3 SYR4 2014
Dichloroacetic Acid
1 µg/L
No EPA limit set
 1/10 SYR4 2012–2019
Monobromoacetic Acid
0.8000 µg/L
No EPA limit set
 1/10 SYR4 2012–2019
83 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, TotalAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ABBEY, KRISTINA
Phone
406-683-4245
Email
[email protected]

Frequently asked questions about Dillon City of

Is Dillon City of tap water safe to drink?

EPA monitoring detected 20 contaminants in Dillon 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 Dillon City of's water?

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

How many people does Dillon City of serve?

Dillon City of reports serving 4,300 people in Montana, per its EPA record.

Has Dillon City of had any water quality violations?

The EPA has 14 violations on file for Dillon 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.