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Tap water quality report

Kona, HI

EPA monitoring detected 20 contaminants across the 4 water suppliers serving Kona. 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
3,455
people served
20
contaminants found
Hawaii rankings Lead in Hawaii PFAS in Hawaii

What was found in Kona'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
2455 µg/L 25%
of the EPA limit 10000 µg/L
Main supplier: KAUPULEHU · 1,945 people · 2019
3/4 SYR4
Nitrate-Nitrite
2445 µg/L 24%
of the EPA limit 10000 µg/L
Main supplier: KAUPULEHU · 1,945 people · 2019
3/4 SYR4
Fluoride
2220 µg/L 56%
of the EPA limit 4000 µg/L
Main supplier: KAUPULEHU · 1,945 people · 2019
3/4 SYR4
Copper
412.6 µg/L 32%
of the EPA limit 1300 µg/L
Main supplier: KAUPULEHU · 1,945 people · 2019
Highest in the city: 596.85 µg/L — KONA WATER SERVICE COMPANY · 260 people · 2019
4/4 SYR4
TTHM
1.1 µg/L 1.4%
of the EPA limit 80 µg/L
Main supplier: KAUPULEHU · 1,945 people · 2019
Highest in the city: 26.5 µg/L — HAWAIIAN OCEAN VIEW ESTATES · 1,000 people · 2019
4/4 SYR4
Bromoform
1.1 µg/L
No EPA limit set
Main supplier: KAUPULEHU · 1,945 people · 2019
Highest in the city: 24.1 µg/L — HAWAIIAN OCEAN VIEW ESTATES · 1,000 people · 2019
4/4 SYR4
Lead
12.53 µg/L 84%
of the EPA limit 15 µg/L
Highest in the city: KONA WATER SERVICE COMPANY · 260 people · 2019
1/4 SYR4
Gross Beta Particle Activity
3.195 pCi/L
No EPA limit set
Main supplier: KAUPULEHU · 1,945 people · 2019
Highest in the city: 11 pCi/L — KONA WATER SERVICE COMPANY · 260 people · 2014
3/4 SYR4
Dibromochloromethane
6.1 µg/L
No EPA limit set
Highest in the city: KEOPU WATER ASSOCIATION · 250 people · 2018
3/4 SYR4
Gross Alpha, Excl. Radon And U
5.91 pCi/L 39%
of the EPA limit 15 pCi/L
Main supplier: KAUPULEHU · 1,945 people · 2019
3/4 SYR4
Bromodichloromethane
5.66 µg/L
No EPA limit set
Highest in the city: KEOPU WATER ASSOCIATION · 250 people · 2018
2/4 SYR4
Total Haloacetic Acids (HAA5)
1.1 µg/L 1.8%
of the EPA limit 60 µg/L
Main supplier: KAUPULEHU · 1,945 people · 2019
Highest in the city: 4.89 µg/L — KEOPU WATER ASSOCIATION · 250 people · 2018
4/4 SYR4
Chloroform
4.655 µg/L
No EPA limit set
Highest in the city: KEOPU WATER ASSOCIATION · 250 people · 2018
1/4 SYR4
Barium
2.5 µg/L 0.1%
of the EPA limit 2000 µg/L
Highest in the city: HAWAIIAN OCEAN VIEW ESTATES · 1,000 people · 2017
1/4 SYR4
Monobromoacetic Acid
2.45 µg/L
No EPA limit set
Highest in the city: KEOPU WATER ASSOCIATION · 250 people · 2018
1/4 SYR4
Dibromoacetic Acid
1.1 µg/L
No EPA limit set
Main supplier: KAUPULEHU · 1,945 people · 2019
Highest in the city: 2.36 µg/L — HAWAIIAN OCEAN VIEW ESTATES · 1,000 people · 2019
4/4 SYR4
Combined Uranium
2.17 µg/L 7.2%
of the EPA limit 30 µg/L
Main supplier: KAUPULEHU · 1,945 people · 2019
1/4 SYR4
Dichloroacetic Acid
1.67 µg/L
No EPA limit set
Highest in the city: KEOPU WATER ASSOCIATION · 250 people · 2018
1/4 SYR4
Trichloroacetic Acid
1.3 µg/L
No EPA limit set
Highest in the city: HAWAIIAN OCEAN VIEW ESTATES · 1,000 people · 2019
3/4 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: KAUPULEHU · 1,945 people · 2022
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 Kona

SupplierPopulation served
KAUPULEHU 1,945
HAWAIIAN OCEAN VIEW ESTATES 1,000
KONA WATER SERVICE COMPANY 260
KEOPU WATER ASSOCIATION 250

Frequently asked questions about Kona tap water

Is Kona tap water safe to drink?

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

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

What contaminants are in Kona's water?

The contaminants EPA monitoring detected in Kona include Nitrate, Nitrate-Nitrite, Fluoride, Copper, 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.