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Tap water quality report

Dolores, CO

EPA monitoring detected 21 contaminants across the 2 water suppliers serving Dolores. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
15,423
people served
21
contaminants found
Colorado rankings Lead in Colorado PFAS in Colorado

What was found in Dolores'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.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
843 µg/L 8.4%
of the EPA limit 10000 µg/L
Highest in the city: DOLORES TOWN OF · 1,626 people · 2019
1/2 SYR4
Nitrate-Nitrite
698.7 µg/L 7%
of the EPA limit 10000 µg/L
Highest in the city: DOLORES TOWN OF · 1,626 people · 2019
1/2 SYR4
Chlorite
495 µg/L 50%
of the EPA limit 1000 µg/L
Main supplier: MONTEZUMA WC · 13,797 people · 2019
1/2 SYR4
Fluoride
130 µg/L 3.3%
of the EPA limit 4000 µg/L
Highest in the city: DOLORES TOWN OF · 1,626 people · 2019
1/2 SYR4
Barium
95 µg/L 4.8%
of the EPA limit 2000 µg/L
Main supplier: MONTEZUMA WC · 13,797 people · 2012
Highest in the city: 110 µg/L — DOLORES TOWN OF · 1,626 people · 2012
2/2 SYR4
TTHM
32.575 µg/L 41%
of the EPA limit 80 µg/L
Main supplier: MONTEZUMA WC · 13,797 people · 2019
Highest in the city: 56.38 µg/L — DOLORES TOWN OF · 1,626 people · 2019
2/2 SYR4
Chloroform
24.2 µg/L
No EPA limit set
Main supplier: MONTEZUMA WC · 13,797 people · 2019
Highest in the city: 46.96 µg/L — DOLORES TOWN OF · 1,626 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
39 µg/L 65%
of the EPA limit 60 µg/L
Main supplier: MONTEZUMA WC · 13,797 people · 2019
2/2 SYR4
Lithium
29.1 µg/L
No EPA limit set
Main supplier: MONTEZUMA WC · 13,797 people · 2025
2/2 UCMR-5
Trichloroacetic Acid
15.35 µg/L
No EPA limit set
Main supplier: MONTEZUMA WC · 13,797 people · 2019
Highest in the city: 25 µg/L — DOLORES TOWN OF · 1,626 people · 2019
2/2 SYR4
Dichloroacetic Acid
23.35 µg/L
No EPA limit set
Main supplier: MONTEZUMA WC · 13,797 people · 2019
2/2 SYR4
Bromodichloromethane
6.78 µg/L
No EPA limit set
Main supplier: MONTEZUMA WC · 13,797 people · 2019
Highest in the city: 12.2 µg/L — DOLORES TOWN OF · 1,626 people · 2019
2/2 SYR4
Dibromochloromethane
1.435 µg/L
No EPA limit set
Main supplier: MONTEZUMA WC · 13,797 people · 2019
Highest in the city: 8.18 µg/L — DOLORES TOWN OF · 1,626 people · 2019
2/2 SYR4
Monochloroacetic Acid
3.42 µg/L
No EPA limit set
Main supplier: MONTEZUMA WC · 13,797 people · 2019
1/2 SYR4
Bromoform
2.975 µg/L
No EPA limit set
Highest in the city: DOLORES TOWN OF · 1,626 people · 2019
1/2 SYR4
Dibromoacetic Acid
2.88 µg/L
No EPA limit set
Highest in the city: DOLORES TOWN OF · 1,626 people · 2019
1/2 SYR4
Gross Alpha, Excl. Radon And U
2.8 pCi/L 19%
of the EPA limit 15 pCi/L
Main supplier: MONTEZUMA WC · 13,797 people · 2014
2/2 SYR4
Combined Radium (-226 And -228)
1.1 pCi/L 22%
of the EPA limit 5 pCi/L
Highest in the city: DOLORES TOWN OF · 1,626 people · 2019
1/2 SYR4
Combined Uranium
0.1900 µg/L 0.6%
of the EPA limit 30 µg/L
Main supplier: MONTEZUMA WC · 13,797 people · 2014
Highest in the city: 1 µg/L — DOLORES TOWN OF · 1,626 people · 2019
2/2 SYR4
Xylenes, Total
0.6000 µg/L 0%
of the EPA limit 10000 µg/L
Highest in the city: DOLORES TOWN OF · 1,626 people · 2019
1/2 SYR4
Lead
0.0029 mg/L 19%
of the EPA limit 0.0150 mg/L
Main supplier: MONTEZUMA WC · 13,797 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 Dolores

SupplierPopulation served
MONTEZUMA WC 13,797
DOLORES TOWN OF 1,626

Frequently asked questions about Dolores tap water

Is Dolores tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Dolores. 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 Dolores?

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

What contaminants are in Dolores's water?

The contaminants EPA monitoring detected in Dolores include Nitrate, Nitrate-Nitrite, Chlorite, Fluoride, Barium. 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.