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Tap water quality report

Mills, City of

EPA monitoring tested this supplier for 80 contaminants and detected 20. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

80
contaminants tested
20
detected
4,050
people served
7
health-based violations
Wyoming rankingsLead in WyomingPFAS in Wyoming
Water source
Ground water under surface influence
Ownership
Local government
Counties served
Natrona

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.

7
health-based violations
12
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2025-01-01 → 2025-03-31
MCL Health-based Resolved 2025-01-01 → 2025-03-31
MCL Health-based Resolved 2024-10-01 → 2024-12-31
MCL Health-based Resolved 2024-10-01 → 2024-12-31
MCL Health-based Resolved 2024-07-01 → 2024-09-30
MCL Health-based Resolved 2024-07-01 → 2024-09-30
MCL Health-based Resolved 2024-07-01 → 2024-09-30
MR Monitoring Archived 1993-08-01 → 1993-08-31
MR Monitoring Archived 1993-08-01 → 1993-08-31
MR Monitoring Archived 1992-12-01 → 1992-12-31

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
TTHM
97.25 µg/L 122%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 109 µg/L
36/36 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
34.16 µg/L 57%
of the EPA limit 60 µg/L
worst single sample: 38 µg/L
33/33 SYR4 2012–2019
Copper
432.5 µg/L 33%
of the EPA limit 1300 µg/L
worst single sample: 600 µg/L
28/30 SYR4 2016–2019
Nitrate-Nitrite
1130 µg/L 11%
of the EPA limit 10000 µg/L
 20/20 SYR4 2012–2019
Bromodichloromethane
28 µg/L
No EPA limit set
worst single sample: 37 µg/L
19/19 SYR4 2013–2019
Chloroform
28.05 µg/L
No EPA limit set
worst single sample: 33 µg/L
19/19 SYR4 2013–2019
Dibromochloromethane
23.2 µg/L
No EPA limit set
worst single sample: 25 µg/L
19/19 SYR4 2013–2019
Bromoform
5.675 µg/L
No EPA limit set
worst single sample: 11 µg/L
16/18 SYR4 2014–2019
Dichloroacetic Acid
13.25 µg/L
No EPA limit set
worst single sample: 14 µg/L
16/16 SYR4 2013–2019
Trichloroacetic Acid
17.4 µg/L
No EPA limit set
worst single sample: 18.6 µg/L
16/16 SYR4 2013–2019
Dibromoacetic Acid
6.11 µg/L
No EPA limit set
worst single sample: 7.3 µg/L
15/16 SYR4 2013–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 9/9 LCR 2025
Monobromoacetic Acid
1.46 µg/L
No EPA limit set
worst single sample: 1.7 µg/L
9/15 SYR4 2014–2019
Fluoride
400 µg/L 10%
of the EPA limit 4000 µg/L
 7/7 SYR4 2012–2019
Selenium
9.6 µg/L 19%
of the EPA limit 50 µg/L
worst single sample: 10 µg/L
5/7 SYR4 2012–2019
Arsenic
5 µg/L 50%
of the EPA limit 10 µg/L
 4/7 SYR4 2012–2019
Monochloroacetic Acid
3.525 µg/L
No EPA limit set
worst single sample: 3.9 µg/L
4/15 SYR4 2014–2019
Combined Radium (-226 And -228)
0.5800 pCi/L 12%
of the EPA limit 5 pCi/L
worst single sample: 0.6000 pCi/L
2/2 SYR4 2013–2014
Lead
4.85 µg/L 32%
of the EPA limit 15 µg/L
worst single sample: 5 µg/L
2/30 SYR4 2016–2019
Gross Alpha, Excl. Radon And U
10.7 pCi/L 71%
of the EPA limit 15 pCi/L
 1/1 SYR4 2013
60 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, TotalAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
COATES, CASEY
Phone
307-234-6679
Email
[email protected]

Frequently asked questions about Mills, City of

Is Mills, City of tap water safe to drink?

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

EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Copper, Nitrate-Nitrite, Bromodichloromethane, and others. The full list with the level and data source for each is above.

How many people does Mills, City of serve?

Mills, City of reports serving 4,050 people in Wyoming, per its EPA record.

Has Mills, City of had any water quality violations?

The EPA has 12 violations on file for Mills, City of, of which 7 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.