Is Black Hawk City of Tap Water Safe? Quality Report

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

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

229

violations on file

still open

Violation	Type	Status	Period
MR	Monitoring	Resolved	2021-09-01 → 2021-09-30
MR	Monitoring	Resolved	2021-09-01 → 2021-09-30
MR	Monitoring	Resolved	2021-09-01 → 2021-09-30
MR	Monitoring	Resolved	2020-04-01 → 2020-06-30
MR	Monitoring	Resolved	2020-04-01 → 2020-06-30
MR	Monitoring	Resolved	2020-04-01 → 2020-06-30
MR	Monitoring	Resolved	2020-04-01 → 2020-06-30
MR	Monitoring	Resolved	2020-04-01 → 2020-06-30
MR	Monitoring	Resolved	2020-04-01 → 2020-06-30
MON	Monitoring	Resolved	2020-02-01 → 2020-02-29

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	82.795 µg/L 103% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 105.2 µg/L	82/82	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	34.75 µg/L 58% of the EPA limit 60 µg/L worst single sample: 58 µg/L	82/82	SYR4	2012–2019
Chlorite	445 µg/L 45% of the EPA limit 1000 µg/L worst single sample: 560 µg/L	66/145	SYR4	2015–2019
Nitrate	456 µg/L 4.6% of the EPA limit 10000 µg/L worst single sample: 500 µg/L	32/32	SYR4	2012–2019
Bromodichloromethane	14.6 µg/L No EPA limit set worst single sample: 18.1 µg/L	24/24	SYR4	2012–2019
Chloroform	25.48 µg/L No EPA limit set worst single sample: 39.9 µg/L	24/24	SYR4	2012–2019
Dibromochloromethane	24.155 µg/L No EPA limit set worst single sample: 25.2 µg/L	24/24	SYR4	2012–2019
Bromoform	17.3 µg/L No EPA limit set worst single sample: 17.8 µg/L	21/24	SYR4	2012–2019
Dibromoacetic Acid	11.725 µg/L No EPA limit set worst single sample: 12.2 µg/L	20/20	SYR4	2018–2019
Dichloroacetic Acid	13.57 µg/L No EPA limit set worst single sample: 14.9 µg/L	20/20	SYR4	2018–2019
Lead	0.0020 mg/L 13% of the EPA limit 0.0150 mg/L	20/20	LCR	2025
Monobromoacetic Acid	2.5 µg/L No EPA limit set worst single sample: 3.4 µg/L	19/20	SYR4	2018–2019
Trichloroacetic Acid	7.1 µg/L No EPA limit set worst single sample: 8.9 µg/L	11/20	SYR4	2018–2019
Lithium	33 µg/L No EPA limit set	4/8	UCMR-5	2024
Monochloroacetic Acid	1.19 µg/L No EPA limit set worst single sample: 1.2 µg/L	3/20	SYR4	2018–2019
Nitrate-Nitrite	374 µg/L 3.7% of the EPA limit 10000 µg/L worst single sample: 390 µg/L	3/3	SYR4	2012–2016
Xylenes, Total	2.58 µg/L 0% of the EPA limit 10000 µg/L worst single sample: 2.8 µg/L	3/21	SYR4	2012–2019
Barium	28.95 µg/L 1.4% of the EPA limit 2000 µg/L worst single sample: 29 µg/L	2/2	SYR4	2012
Antimony, Total	2 µg/L 33% of the EPA limit 6 µg/L	1/2	SYR4	2012
Combined Uranium	1.2 µg/L 4% of the EPA limit 30 µg/L	1/2	SYR4	2017
Fluoride	420 µg/L 11% of the EPA limit 4000 µg/L	1/2	SYR4	2012

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-PF3ONSAdonaArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: DALLAM, BRADLEY
Phone: 303-582-2237
Email: [email protected]

Frequently asked questions about Black Hawk City of

Is Black Hawk City of tap water safe to drink?

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

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

How many people does Black Hawk City of serve?

Black Hawk City of reports serving 15,167 people in Colorado, per its EPA record.

Has Black Hawk City of had any water quality violations?

The EPA has 229 violations on file for Black Hawk 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.