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Tap water quality report

Chester Town of

EPA monitoring tested this supplier for 69 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

69
contaminants tested
16
detected
870
people served
1
health-based violations
Montana rankingsLead in MontanaPFAS in Montana
Water source
Surface water
Ownership
Local government
Counties served
Liberty

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.

1
health-based violations
24
violations on file
2
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 1993-12-01 → 1993-12-31
MR Monitoring Unaddressed 2025-10-01
MR Monitoring Unaddressed 2025-10-01
MR Monitoring Resolved 2017-01-01 → 2022-12-31
MR Monitoring Resolved 2017-01-01 → 2022-12-31
MR Monitoring Resolved 2017-01-01 → 2022-12-31
MR Monitoring Resolved 2017-01-01 → 2022-12-31
MR Monitoring Resolved 2017-01-01 → 2022-12-31
MR Monitoring Resolved 2017-01-01 → 2022-12-31
MR Monitoring Resolved 2017-01-01 → 2022-12-31

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
Bromodichloromethane
12 µg/L
No EPA limit set
 30/30 SYR4 2012–2019
Copper
1016.35 µg/L 78%
of the EPA limit 1300 µg/L
worst single sample: 2680 µg/L
30/30 SYR4 2013–2019
Chloroform
47.1 µg/L
No EPA limit set
worst single sample: 49 µg/L
30/30 SYR4 2012–2019
Dibromochloromethane
2.865 µg/L
No EPA limit set
worst single sample: 3.1 µg/L
30/30 SYR4 2012–2019
TTHM
61 µg/L 76%
of the EPA limit 80 µg/L
worst single sample: 62 µg/L
30/30 SYR4 2012–2019
Dichloroacetic Acid
24.35 µg/L
No EPA limit set
worst single sample: 32 µg/L
18/18 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
52.2 µg/L 87%
of the EPA limit 60 µg/L
worst single sample: 59 µg/L
18/18 SYR4 2012–2019
Trichloroacetic Acid
27 µg/L
No EPA limit set
 18/18 SYR4 2012–2019
Nitrate-Nitrite
150 µg/L 1.5%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Dibromoacetic Acid
0.5930 µg/L
No EPA limit set
worst single sample: 0.6000 µg/L
15/18 SYR4 2012–2019
Lead
3 µg/L 20%
of the EPA limit 15 µg/L
 15/30 SYR4 2013–2019
Monochloroacetic Acid
2.7 µg/L
No EPA limit set
worst single sample: 3 µg/L
13/18 SYR4 2012–2019
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2025
Fluoride
200 µg/L 5%
of the EPA limit 4000 µg/L
 2/2 SYR4 2012–2013
Dichloromethane
9.4 µg/L 188%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
 1/12 SYR4 2012–2019
Xylenes, Total
1.8 µg/L 0%
of the EPA limit 10000 µg/L
 1/12 SYR4 2012–2019
53 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 TetrachlorideChlordaneChromiumDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
WICKUM, ASHLEY
Phone
406-759-5635
Email
townofchester@itstriangle.com

Frequently asked questions about Chester Town of

Is Chester Town of tap water safe to drink?

EPA monitoring detected 16 contaminants in Chester 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 Chester Town of's water?

EPA monitoring detected Bromodichloromethane, Copper, Chloroform, Dibromochloromethane, TTHM, and others. The full list with the level and data source for each is above.

How many people does Chester Town of serve?

Chester Town of reports serving 870 people in Montana, per its EPA record.

Has Chester Town of had any water quality violations?

The EPA has 24 violations on file for Chester Town of, of which 1 is health-based (a contaminant limit or required treatment was breached) and 2 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.