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Tap water quality report

Little Rock, AR

EPA monitoring detected 17 contaminants across the 2 water suppliers serving Little Rock. 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
370,418
people served
17
contaminants found
Arkansas rankings Lead in Arkansas PFAS in Arkansas

What was found in Little Rock'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
848.5 µg/L 21%
of the EPA limit 4000 µg/L
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
1/2 SYR4
Chlorite
438.3 µg/L 44%
of the EPA limit 1000 µg/L
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
1/2 SYR4
Copper
136.1 µg/L 10%
of the EPA limit 1300 µg/L
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
Highest in the city: 193.42 µg/L — WYE MOUNTAIN WATER ASSOCIATION · 1,963 people · 2019
2/2 SYR4
Nitrate-Nitrite
110 µg/L 1.1%
of the EPA limit 10000 µg/L
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
1/2 SYR4
TTHM
76.055 µg/L 95%
of the EPA limit 80 µg/L
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
2/2 SYR4
Chloroform
69.685 µg/L
No EPA limit set
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
35.5 µg/L 59%
of the EPA limit 60 µg/L
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
2/2 SYR4
Dichloroacetic Acid
18.61 µg/L
No EPA limit set
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
2/2 SYR4
Trichloroacetic Acid
15.355 µg/L
No EPA limit set
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
2/2 SYR4
Bromodichloromethane
7.594 µg/L
No EPA limit set
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
Highest in the city: 10.62 µg/L — WYE MOUNTAIN WATER ASSOCIATION · 1,963 people · 2019
2/2 SYR4
Lead
9.8 µg/L 65%
of the EPA limit 15 µg/L
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
Highest in the city: 10.4 µg/L — WYE MOUNTAIN WATER ASSOCIATION · 1,963 people · 2019
2/2 SYR4
Monobromoacetic Acid
3.35 µg/L
No EPA limit set
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
2/2 SYR4
Monochloroacetic Acid
3.12 µg/L
No EPA limit set
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
2/2 SYR4
Dibromochloromethane
1.514 µg/L
No EPA limit set
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
Highest in the city: 2.5 µg/L — WYE MOUNTAIN WATER ASSOCIATION · 1,963 people · 2019
2/2 SYR4
Dibromoacetic Acid
1.16 µg/L
No EPA limit set
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2019
1/2 SYR4
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2025
Highest in the city: 0.1580 mg/L — WYE MOUNTAIN WATER ASSOCIATION · 1,963 people · 2009
2/2 LCR
Benzo(A)Pyrene
0.0600 µg/L 30%
of the EPA limit 0.2000 µg/L
Main supplier: CENTRAL ARKANSAS WATER · 368,455 people · 2018
1/2 SYR4
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 Little Rock

SupplierPopulation served
CENTRAL ARKANSAS WATER 368,455
WYE MOUNTAIN WATER ASSOCIATION 1,963

Frequently asked questions about Little Rock tap water

Is Little Rock tap water safe to drink?

EPA testing detected 17 contaminants in the water serving Little Rock. 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 Little Rock?

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

What contaminants are in Little Rock's water?

The contaminants EPA monitoring detected in Little Rock include Fluoride, Chlorite, Copper, Nitrate-Nitrite, TTHM. 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.