Is Arvada, CO Tap Water Safe? Quality & Contaminants

What was found in Arvada's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Fluoride	848.5 µg/L 21% of the EPA limit 4000 µg/L Main supplier: ARVADA CITY OF · 171,610 people · 2019	1/2	SYR4
Nitrate	160 µg/L 1.6% of the EPA limit 10000 µg/L Main supplier: ARVADA CITY OF · 171,610 people · 2019	1/2	SYR4
Nitrate-Nitrite	155.5 µg/L 1.6% of the EPA limit 10000 µg/L Main supplier: ARVADA CITY OF · 171,610 people · 2019	1/2	SYR4
TTHM	66.135 µg/L 83% of the EPA limit 80 µg/L Main supplier: ARVADA CITY OF · 171,610 people · 2019	2/2	SYR4
Total Haloacetic Acids (HAA5)	49.395 µg/L 82% of the EPA limit 60 µg/L Main supplier: ARVADA CITY OF · 171,610 people · 2019	2/2	SYR4
Chloroform	40.58 µg/L No EPA limit set Main supplier: ARVADA CITY OF · 171,610 people · 2019 Highest in the city: 46.35 µg/L — RALSTON VALLEY WSD · 1,610 people · 2019	2/2	SYR4
Barium	36 µg/L 1.8% of the EPA limit 2000 µg/L Main supplier: ARVADA CITY OF · 171,610 people · 2019	1/2	SYR4
Trichloroacetic Acid	20.775 µg/L No EPA limit set Main supplier: ARVADA CITY OF · 171,610 people · 2019	2/2	SYR4
Dichloroacetic Acid	15.85 µg/L No EPA limit set Main supplier: ARVADA CITY OF · 171,610 people · 2019 Highest in the city: 18.44 µg/L — RALSTON VALLEY WSD · 1,610 people · 2019	2/2	SYR4
Lithium	9.6 µg/L No EPA limit set Main supplier: ARVADA CITY OF · 171,610 people · 2024	1/2	UCMR-5
Bromodichloromethane	5.64 µg/L No EPA limit set Main supplier: ARVADA CITY OF · 171,610 people · 2019 Highest in the city: 7.61 µg/L — RALSTON VALLEY WSD · 1,610 people · 2019	2/2	SYR4
Gross Beta Particle Activity	3.49 pCi/L No EPA limit set Main supplier: ARVADA CITY OF · 171,610 people · 2019	1/2	SYR4
Monochloroacetic Acid	1.37 µg/L No EPA limit set Main supplier: ARVADA CITY OF · 171,610 people · 2019 Highest in the city: 2.68 µg/L — RALSTON VALLEY WSD · 1,610 people · 2019	2/2	SYR4
Combined Uranium	2.46 µg/L 8.2% of the EPA limit 30 µg/L Main supplier: ARVADA CITY OF · 171,610 people · 2019	1/2	SYR4
Gross Alpha, Excl. Radon And U	2 pCi/L 13% of the EPA limit 15 pCi/L Main supplier: ARVADA CITY OF · 171,610 people · 2019	1/2	SYR4
Combined Radium (-226 And -228)	1.6 pCi/L 32% of the EPA limit 5 pCi/L Main supplier: ARVADA CITY OF · 171,610 people · 2019	1/2	SYR4
Dibromochloromethane	1.136 µg/L No EPA limit set Main supplier: ARVADA CITY OF · 171,610 people · 2019 Highest in the city: 1.15 µg/L — RALSTON VALLEY WSD · 1,610 people · 2019	2/2	SYR4
Di(2-ethylhexyl) Phthalate	0.8200 µg/L 14% of the EPA limit 6 µg/L Main supplier: ARVADA CITY OF · 171,610 people · 2019	1/2	SYR4
Lead	0.0031 mg/L 21% of the EPA limit 0.0150 mg/L Main supplier: ARVADA CITY OF · 171,610 people · 2025	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 95th percentile of the system's samples — 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

Supplier	Population 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 level at the main supplier 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.