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Tap water quality report

Old Hays

EPA monitoring tested this supplier for 73 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

73
contaminants tested
8
detected
80
people served
4
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Native American

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.

4
health-based violations
85
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2015-01-01
TT Health-based Resolved 2015-01-01
TT Health-based Resolved 2015-01-01
TT Health-based Resolved 2015-01-01
MR Monitoring Resolved 2019-06-01
MR Monitoring Resolved 2008-01-01 → 2010-12-31
MR Monitoring Resolved 2008-01-01 → 2010-12-31
MR Monitoring Resolved 2008-01-01 → 2010-12-31
MR Monitoring Resolved 2008-01-01 → 2010-12-31
MR Monitoring Resolved 2008-01-01 → 2010-12-31

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
Nitrate-Nitrite
590 µg/L 5.9%
of the EPA limit 10000 µg/L
 18/18 SYR4 2012–2019
Copper
556.9 µg/L 43%
of the EPA limit 1300 µg/L
worst single sample: 1000 µg/L
15/15 SYR4 2013–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 10/10 LCR 2025
Lead
11.35 µg/L 76%
of the EPA limit 15 µg/L
worst single sample: 13 µg/L
4/15 SYR4 2013–2019
Selenium
6.95 µg/L 14%
of the EPA limit 50 µg/L
worst single sample: 7 µg/L
2/2 SYR4 2016–2018
Chromium
10 µg/L 10%
of the EPA limit 100 µg/L
 1/2 SYR4 2016–2018
Combined Uranium
6 µg/L 20%
of the EPA limit 30 µg/L
 1/1 SYR4 2016
Fluoride
400 µg/L 10%
of the EPA limit 4000 µg/L
 1/1 SYR4 2018
65 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorOxamylPentachlorophenolPicloramSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
RAMONE, KASEY
Phone
406-353-8313
Email
[email protected]

Frequently asked questions about Old Hays

Is Old Hays tap water safe to drink?

EPA monitoring detected 8 contaminants in Old Hays'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 Old Hays's water?

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

How many people does Old Hays serve?

Old Hays reports serving 80 people in Montana, per its EPA record.

Has Old Hays had any water quality violations?

The EPA has 85 violations on file for Old Hays, of which 4 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.