Tap WaterIndex

← Montana

Tap water quality report

Darby Town of

EPA monitoring tested this supplier for 72 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

72
contaminants tested
12
detected
850
people served
59
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Ground water
Ownership
Local government
Counties served
Ravalli

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.

59
health-based violations
639
violations on file
7
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2024-08-06
TT Health-based Resolved 2024-08-06
TT Health-based Resolved 2024-08-06
MCL Health-based Resolved 2005-09-01 → 2005-09-30
MCL Health-based Resolved 2005-09-01 → 2005-09-30
MCL Health-based Resolved 2005-09-01 → 2005-09-30
MCL Health-based Resolved 2005-09-01 → 2005-09-30
MCL Health-based Resolved 2005-09-01 → 2005-09-30
MCL Health-based Resolved 2005-09-01 → 2005-09-30
MCL Health-based Resolved 2005-09-01 → 2005-09-30

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
1226.5 µg/L 94%
of the EPA limit 1300 µg/L
worst single sample: 2580 µg/L
30/30 SYR4 2012–2018
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 26/26 LCR 2025
Lead
5.75 µg/L 38%
of the EPA limit 15 µg/L
worst single sample: 11 µg/L
16/30 SYR4 2012–2018
Nitrate-Nitrite
1720 µg/L 17%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
TTHM
2.07 µg/L 2.6%
of the EPA limit 80 µg/L
worst single sample: 2.1 µg/L
7/10 SYR4 2012–2019
Bromodichloromethane
0.8480 µg/L
No EPA limit set
worst single sample: 0.8600 µg/L
5/10 SYR4 2012–2019
Chloroform
0.9200 µg/L
No EPA limit set
worst single sample: 0.9500 µg/L
5/10 SYR4 2012–2019
Dichloroacetic Acid
0.9190 µg/L
No EPA limit set
worst single sample: 0.9300 µg/L
3/7 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
1.39 µg/L 2.3%
of the EPA limit 60 µg/L
worst single sample: 1.4 µg/L
3/7 SYR4 2012–2019
Fluoride
600 µg/L 15%
of the EPA limit 4000 µg/L
 1/1 SYR4 2012
Gross Alpha, Excl. Radon And U
2 pCi/L 13%
of the EPA limit 15 pCi/L
 1/1 SYR4 2019
Trichloroacetic Acid
0.5600 µg/L
No EPA limit set
 1/7 SYR4 2012–2019
60 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, TotalArsenicAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MCKINNEY, NANCY
Phone
406-821-3753

Frequently asked questions about Darby Town of

Is Darby Town of tap water safe to drink?

EPA monitoring detected 12 contaminants in Darby 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 Darby Town of's water?

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

How many people does Darby Town of serve?

Darby Town of reports serving 850 people in Montana, per its EPA record.

Has Darby Town of had any water quality violations?

The EPA has 639 violations on file for Darby Town of, of which 59 are health-based (a contaminant limit or required treatment was breached) and 7 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.