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Tap water quality report

Arvada, CO

EPA monitoring detected 19 contaminants across the 2 water suppliers serving Arvada. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

2
water suppliers
173,220
people served
19
contaminants found
Colorado rankings Lead in Colorado PFAS in Colorado

What was found in Arvada's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Fluoride
930 µg/L 23%
of the EPA limit 4000 µg/L
 1/2 SYR4
Nitrate
160 µg/L 1.6%
of the EPA limit 10000 µg/L
 1/2 SYR4
Nitrate-Nitrite
160 µg/L 1.6%
of the EPA limit 10000 µg/L
 1/2 SYR4
TTHM
156 µg/L 195%
of the EPA limit, in the worst sample — 80 µg/L
 2/2 SYR4
Total Haloacetic Acids (HAA5)
68.5 µg/L 114%
of the EPA limit, in the worst sample — 60 µg/L
 2/2 SYR4
Chloroform
47.7 µg/L
No EPA limit set
 2/2 SYR4
Barium
37 µg/L 1.9%
of the EPA limit 2000 µg/L
 1/2 SYR4
Trichloroacetic Acid
23.1 µg/L
No EPA limit set
 2/2 SYR4
Dichloroacetic Acid
18.8 µg/L
No EPA limit set
 2/2 SYR4
Lithium
9.6 µg/L
No EPA limit set
 1/2 UCMR-5
Bromodichloromethane
8.6 µg/L
No EPA limit set
 2/2 SYR4
Gross Alpha, Excl. Radon And U
5.6 pCi/L 37%
of the EPA limit 15 pCi/L
 1/2 SYR4
Gross Beta Particle Activity
4.8 pCi/L
No EPA limit set
 1/2 SYR4
Monochloroacetic Acid
3.2 µg/L
No EPA limit set
 2/2 SYR4
Combined Uranium
2.9 µg/L 9.7%
of the EPA limit 30 µg/L
 1/2 SYR4
Combined Radium (-226 And -228)
2.6 pCi/L 52%
of the EPA limit 5 pCi/L
 1/2 SYR4
Dibromochloromethane
1.2 µg/L
No EPA limit set
 2/2 SYR4
Di(2-ethylhexyl) Phthalate
0.8200 µg/L 14%
of the EPA limit 6 µg/L
 1/2 SYR4
Lead
0.0031 mg/L 21%
of the EPA limit 0.0150 mg/L
 2/2 LCR
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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Arvada

SupplierPopulation served
ARVADA CITY OF 171,610
RALSTON VALLEY WSD 1,610

Frequently asked questions about Arvada tap water

Is Arvada tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Arvada. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Arvada?

2 public water suppliers report drinking-water monitoring for Arvada, Colorado to the EPA. Each is listed above with its population served.

What contaminants are in Arvada's water?

The contaminants EPA monitoring detected in Arvada include Fluoride, Nitrate, Nitrate-Nitrite, TTHM, Total Haloacetic Acids (HAA5). The full list, with the highest level found and the data source, is in the table above.

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.