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Tap water quality report

Ennis Town of

EPA monitoring tested this supplier for 69 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

69
contaminants tested
11
detected
1,400
people served
3
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Local government
Counties served
Madison

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.

3
health-based violations
171
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1994-11-01 → 1994-11-30
MCL Health-based Resolved 1994-10-01 → 1994-10-31
MCL Health-based Resolved 1994-09-01 → 1994-09-30
MR Monitoring Resolved 2023-10-01
MR Monitoring Resolved 2023-10-01
MR Monitoring Resolved 2023-10-01
MR Monitoring Resolved 2020-10-01
MR Monitoring Resolved 2020-10-01
MR Monitoring Resolved 2020-10-01
MR Monitoring Resolved 2018-07-01 → 2018-09-30

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
Copper
250.85 µg/L 19%
of the EPA limit 1300 µg/L
worst single sample: 305 µg/L
20/20 SYR4 2014–2017
Nitrate-Nitrite
1439 µg/L 14%
of the EPA limit 10000 µg/L
worst single sample: 1610 µg/L
20/20 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 10/10 LCR 2026
Arsenic
2.75 µg/L 28%
of the EPA limit 10 µg/L
worst single sample: 3 µg/L
6/8 SYR4 2012–2018
Barium
110 µg/L 5.5%
of the EPA limit 2000 µg/L
 6/6 SYR4 2012–2018
Fluoride
975 µg/L 24%
of the EPA limit 4000 µg/L
worst single sample: 1000 µg/L
6/6 SYR4 2012–2018
Combined Uranium
6.8 µg/L 23%
of the EPA limit 30 µg/L
worst single sample: 7 µg/L
5/5 SYR4 2013–2018
Lead
3.7 µg/L 25%
of the EPA limit 15 µg/L
worst single sample: 4 µg/L
3/20 SYR4 2014–2017
Combined Radium (-226 And -228)
1.56 pCi/L 31%
of the EPA limit 5 pCi/L
worst single sample: 1.6 pCi/L
2/5 SYR4 2013–2018
Gross Alpha, Excl. Radon And U
3.315 pCi/L 22%
of the EPA limit 15 pCi/L
worst single sample: 3.4 pCi/L
2/5 SYR4 2013–2018
Nitrate
420 µg/L 4.2%
of the EPA limit 10000 µg/L
 2/2 SYR4 2014
58 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, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HAAS, NICI
Phone
406-902-9097
Email
[email protected]

Frequently asked questions about Ennis Town of

Is Ennis Town of tap water safe to drink?

EPA monitoring detected 11 contaminants in Ennis Town 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 Ennis Town of's water?

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

How many people does Ennis Town of serve?

Ennis Town of reports serving 1,400 people in Montana, per its EPA record.

Has Ennis Town of had any water quality violations?

The EPA has 171 violations on file for Ennis Town of, of which 3 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.