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Tap water quality report

Johnstown Town of

EPA monitoring tested this supplier for 104 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

104
contaminants tested
15
detected
27,295
people served
21
health-based violations
Colorado rankingsLead in ColoradoPFAS in Colorado
Water source
Surface water
Ownership
Local government
Counties served
Weld

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.

21
health-based violations
284
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2021-07-01 → 2021-07-31
TT Health-based Resolved 2021-07-01 → 2021-07-31
TT Health-based Resolved 2021-07-01 → 2021-07-31
TT Health-based Resolved 2021-07-01 → 2021-07-31
TT Health-based Resolved 2020-07-01 → 2020-09-30
TT Health-based Resolved 2020-07-01 → 2020-09-30
TT Health-based Resolved 2020-07-01 → 2020-09-30
TT Health-based Resolved 2020-07-01 → 2020-09-30
TT Health-based Resolved 2005-10-01 → 2005-12-31
TT Health-based Resolved 2005-10-01 → 2005-12-31

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
69.85 µg/L 87%
of the EPA limit 80 µg/L
worst single sample: 75.6 µg/L
55/55 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
37.426 µg/L 62%
of the EPA limit 60 µg/L
worst single sample: 46.8 µg/L
55/55 SYR4 2012–2019
Bromodichloromethane
8.9 µg/L
No EPA limit set
worst single sample: 13.5 µg/L
42/42 SYR4 2012–2019
Chloroform
58.725 µg/L
No EPA limit set
worst single sample: 63.4 µg/L
42/42 SYR4 2012–2019
Dichloroacetic Acid
17.035 µg/L
No EPA limit set
worst single sample: 20.3 µg/L
40/40 SYR4 2015–2019
Trichloroacetic Acid
21.23 µg/L
No EPA limit set
worst single sample: 24.9 µg/L
40/40 SYR4 2015–2019
Dibromochloromethane
1.125 µg/L
No EPA limit set
worst single sample: 1.6 µg/L
20/42 SYR4 2012–2019
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 20/20 LCR 2025
Monochloroacetic Acid
2.52 µg/L
No EPA limit set
worst single sample: 2.8 µg/L
15/40 SYR4 2015–2019
Barium
34.6 µg/L 1.7%
of the EPA limit 2000 µg/L
worst single sample: 36 µg/L
8/8 SYR4 2012–2019
Nitrate
400 µg/L 4%
of the EPA limit 10000 µg/L
 4/14 SYR4 2012–2019
Fluoride
167 µg/L 4.2%
of the EPA limit 4000 µg/L
worst single sample: 170 µg/L
3/8 SYR4 2012–2019
Selenium
2.95 µg/L 5.9%
of the EPA limit 50 µg/L
worst single sample: 3 µg/L
2/8 SYR4 2012–2019
Chromium
3 µg/L 3%
of the EPA limit 100 µg/L
 1/8 SYR4 2012–2019
Monobromoacetic Acid
1.02 µg/L
No EPA limit set
 1/40 SYR4 2015–2019
89 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, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
VENETTE, GREG
Phone
720-600-9577
Email
[email protected]

Frequently asked questions about Johnstown Town of

Is Johnstown Town of tap water safe to drink?

EPA monitoring detected 15 contaminants in Johnstown 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 Johnstown Town of's water?

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

How many people does Johnstown Town of serve?

Johnstown Town of reports serving 27,295 people in Colorado, per its EPA record.

Has Johnstown Town of had any water quality violations?

The EPA has 284 violations on file for Johnstown Town of, of which 21 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.