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Tap water quality report

Littleton, CO

EPA monitoring detected 20 contaminants across the 4 water suppliers serving Littleton. 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.

4
water suppliers
26,126
people served
20
contaminants found
Colorado rankings Lead in Colorado PFAS in Colorado

What was found in Littleton'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
Fluoride
655 µg/L 16%
of the EPA limit 4000 µg/L
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
1/4 SYR4
Nitrate
200 µg/L 2%
of the EPA limit 10000 µg/L
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
1/4 SYR4
Nitrate-Nitrite
86 µg/L 0.9%
of the EPA limit 10000 µg/L
Main supplier: ROXBOROUGH WSD · 13,765 people · 2012
1/4 SYR4
TTHM
80.44 µg/L 101%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
3/4 SYR4
Chloroform
63.06 µg/L
No EPA limit set
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
3/4 SYR4
Barium
46.65 µg/L 2.3%
of the EPA limit 2000 µg/L
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
1/4 SYR4
Total Haloacetic Acids (HAA5)
41.0255 µg/L 68%
of the EPA limit 60 µg/L
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
3/4 SYR4
Dichloroacetic Acid
20.556 µg/L
No EPA limit set
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
3/4 SYR4
Dibromochloromethane
8.06 µg/L
No EPA limit set
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
Highest in the city: 19.56 µg/L — ROXBOROUGH NW DOUGLAS COUNTY · 860 people · 2019
3/4 SYR4
Bromodichloromethane
18.36 µg/L
No EPA limit set
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
3/4 SYR4
Trichloroacetic Acid
17.001 µg/L
No EPA limit set
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
3/4 SYR4
Lithium
9.09 µg/L
No EPA limit set
Main supplier: ROXBOROUGH WSD · 13,765 people · 2025
1/4 UCMR-5
Bromoform
1.1 µg/L
No EPA limit set
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
Highest in the city: 6.96 µg/L — ROXBOROUGH NW DOUGLAS COUNTY · 860 people · 2019
2/4 SYR4
Dibromoacetic Acid
1.908 µg/L
No EPA limit set
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
Highest in the city: 5.46 µg/L — ROXBOROUGH NW DOUGLAS COUNTY · 860 people · 2019
2/4 SYR4
Monobromoacetic Acid
2.614 µg/L
No EPA limit set
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
2/4 SYR4
Monochloroacetic Acid
2.546 µg/L
No EPA limit set
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
2/4 SYR4
Selenium
2 µg/L 4%
of the EPA limit 50 µg/L
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
1/4 SYR4
Chromium
1.95 µg/L 2%
of the EPA limit 100 µg/L
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
1/4 SYR4
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
Main supplier: ROXBOROUGH WSD · 13,765 people · 2019
1/4 SYR4
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
Main supplier: ROXBOROUGH WSD · 13,765 people · 2025
Highest in the city: 0.0058 mg/L — ROXBOROUGH NW DOUGLAS COUNTY · 860 people · 2025
4/4 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 Littleton

SupplierPopulation served
ROXBOROUGH WSD 13,765
STERLING RANCH CAB 11,501
ROXBOROUGH NW DOUGLAS COUNTY 860
DOMINION WSD 0

Frequently asked questions about Littleton tap water

Is Littleton tap water safe to drink?

EPA testing detected 20 contaminants in the water serving Littleton. 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 Littleton?

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

What contaminants are in Littleton's water?

The contaminants EPA monitoring detected in Littleton include Fluoride, Nitrate, Nitrate-Nitrite, TTHM, Chloroform. 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.