Is Westminster City of Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Local government
Counties served: Adams

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MR	Monitoring	Resolved	2025-01-01 → 2025-01-31
MR	Monitoring	Resolved	2025-01-01 → 2025-01-31
MR	Monitoring	Resolved	2025-01-01 → 2025-01-31
MR	Monitoring	Resolved	2025-01-01 → 2025-01-31
MR	Monitoring	Resolved	2024-12-01 → 2024-12-31
MR	Monitoring	Resolved	2024-12-01 → 2024-12-31
MR	Monitoring	Resolved	2024-12-01 → 2024-12-31
MR	Monitoring	Resolved	2024-12-01 → 2024-12-31
MR	Monitoring	Resolved	2022-01-01 → 2022-01-31
MR	Monitoring	Resolved	2022-01-01 → 2022-01-31

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
TTHM	41.925 µg/L 52% of the EPA limit 80 µg/L worst single sample: 49.76 µg/L	256/256	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	17.1 µg/L 29% of the EPA limit 60 µg/L worst single sample: 24.1 µg/L	256/256	SYR4	2012–2019
Nitrate	150 µg/L 1.5% of the EPA limit 10000 µg/L	32/32	SYR4	2012–2019
Bromodichloromethane	17.95 µg/L No EPA limit set worst single sample: 18 µg/L	26/26	SYR4	2013–2019
Chloroform	21.725 µg/L No EPA limit set worst single sample: 22.5 µg/L	26/26	SYR4	2013–2019
Dibromochloromethane	9.36 µg/L No EPA limit set worst single sample: 9.54 µg/L	26/26	SYR4	2013–2019
Dibromoacetic Acid	1.8 µg/L No EPA limit set worst single sample: 1.83 µg/L	24/24	SYR4	2018–2019
Dichloroacetic Acid	11.073 µg/L No EPA limit set worst single sample: 11.8 µg/L	24/24	SYR4	2018–2019
Trichloroacetic Acid	4.691 µg/L No EPA limit set worst single sample: 5.01 µg/L	24/24	SYR4	2018–2019
Bromoform	1.149 µg/L No EPA limit set worst single sample: 1.25 µg/L	23/26	SYR4	2013–2019
Lead	0.0013 mg/L 8.7% of the EPA limit 0.0150 mg/L	20/20	LCR	2025
Barium	55.5 µg/L 2.8% of the EPA limit 2000 µg/L worst single sample: 57 µg/L	16/16	SYR4	2012–2019
Fluoride	620 µg/L 16% of the EPA limit 4000 µg/L worst single sample: 650 µg/L	16/16	SYR4	2012–2019
Nitrate-Nitrite	150 µg/L 1.5% of the EPA limit 10000 µg/L	14/14	SYR4	2012–2019
Lithium	21.3 µg/L No EPA limit set	8/8	UCMR-5	2024
Nitrite	60 µg/L 6% of the EPA limit 1000 µg/L	4/14	SYR4	2012–2019
Chromium	1 µg/L 1% of the EPA limit 100 µg/L	2/16	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	0.2900 pCi/L 1.9% of the EPA limit 15 pCi/L worst single sample: 0.3000 pCi/L	2/2	SYR4	2018
Xylenes, Total	0.6765 µg/L 0% of the EPA limit 10000 µg/L worst single sample: 0.6800 µg/L	2/20	SYR4	2012–2019
Combined Uranium	1.1 µg/L 3.7% of the EPA limit 30 µg/L	1/2	SYR4	2018
Di(2-ethylhexyl) Phthalate	0.7000 µg/L 12% of the EPA limit 6 µg/L	1/12	SYR4	2012–2017

85 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: DECKER, RYAN
Phone: 303-658-2374
Email: [email protected]

Frequently asked questions about Westminster City of

Is Westminster City of tap water safe to drink?

EPA monitoring detected 21 contaminants in Westminster 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 Westminster City of's water?

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

How many people does Westminster City of serve?

Westminster City of reports serving 202,078 people in Colorado, per its EPA record.

Has Westminster City of had any water quality violations?

The EPA has 18 violations on file for Westminster City of, of which 0 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.