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Tap water quality report

Boulder City of

EPA monitoring tested this supplier for 106 contaminants and detected 13. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

106
contaminants tested
13
detected
166,080
people served
12
health-based violations
Colorado rankingsLead in ColoradoPFAS in Colorado
Water source
Surface water
Ownership
Local government
Counties served
Boulder

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.

12
health-based violations
31
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-07-01 → 2017-09-30
MCL Health-based Resolved 2017-04-01 → 2017-06-30
MCL Health-based Resolved 2017-04-01 → 2017-06-30
MCL Health-based Resolved 2017-04-01 → 2017-06-30
MCL Health-based Resolved 2017-04-01 → 2017-06-30
TT Health-based Resolved 2010-01-01 → 2010-01-31
TT Health-based Resolved 2010-01-01 → 2010-01-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
TTHM
58.575 µg/L 73%
of the EPA limit 80 µg/L
worst single sample: 137.02 µg/L
376/376 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
65.05 µg/L 108%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
worst single sample: 185.84 µg/L
376/376 SYR4 2012–2019
Fluoride
810 µg/L 20%
of the EPA limit 4000 µg/L
worst single sample: 910 µg/L
47/47 SYR4 2012–2019
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 19/19 LCR 2025
Barium
22.35 µg/L 1.1%
of the EPA limit 2000 µg/L
worst single sample: 47 µg/L
18/18 SYR4 2012–2019
Bromodichloromethane
4.5035 µg/L
No EPA limit set
worst single sample: 4.75 µg/L
18/18 SYR4 2012–2019
Chloroform
29.71 µg/L
No EPA limit set
worst single sample: 34.3 µg/L
18/18 SYR4 2012–2019
Dichloroacetic Acid
11.575 µg/L
No EPA limit set
worst single sample: 11.8 µg/L
16/16 SYR4 2018–2019
Trichloroacetic Acid
13.925 µg/L
No EPA limit set
worst single sample: 17.3 µg/L
16/16 SYR4 2018–2019
Dibromochloromethane
0.5896 µg/L
No EPA limit set
worst single sample: 0.5940 µg/L
5/18 SYR4 2012–2019
Nitrate
150 µg/L 1.5%
of the EPA limit 10000 µg/L
 2/36 SYR4 2012–2019
Chromium
1 µg/L 1%
of the EPA limit 100 µg/L
 1/18 SYR4 2012–2019
Tetrachloroethylene
3.1 µg/L 62%
of the EPA limit 5 µg/L
 1/38 SYR4 2012–2019
93 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, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
STODDARD, JON
Phone
720-564-2320
Email
[email protected]

Frequently asked questions about Boulder City of

Is Boulder City of tap water safe to drink?

EPA monitoring detected 13 contaminants in Boulder 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 Boulder City of's water?

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

How many people does Boulder City of serve?

Boulder City of reports serving 166,080 people in Colorado, per its EPA record.

Has Boulder City of had any water quality violations?

The EPA has 31 violations on file for Boulder City of, of which 12 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.