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Tap water quality report

Kahuku, HI

EPA monitoring detected 9 contaminants across the 1 water supplier serving Kahuku. 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.

1
water supplier
2,730
people served
9
contaminants found
Hawaii rankings Lead in Hawaii PFAS in Hawaii

What was found in Kahuku'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
1100 µg/L 11%
of the EPA limit 10000 µg/L
Main supplier: KAHUKU · 2,730 people · 2019
1/1 SYR4
Nitrate-Nitrite
1060 µg/L 11%
of the EPA limit 10000 µg/L
Main supplier: KAHUKU · 2,730 people · 2019
1/1 SYR4
Fluoride
63 µg/L 1.6%
of the EPA limit 4000 µg/L
Main supplier: KAHUKU · 2,730 people · 2019
1/1 SYR4
Copper
6.77 µg/L 0.5%
of the EPA limit 1300 µg/L
Main supplier: KAHUKU · 2,730 people · 2017
1/1 SYR4
Barium
3.56 µg/L 0.2%
of the EPA limit 2000 µg/L
Main supplier: KAHUKU · 2,730 people · 2017
1/1 SYR4
Chromium
1.5 µg/L 1.5%
of the EPA limit 100 µg/L
Main supplier: KAHUKU · 2,730 people · 2017
1/1 SYR4
Bromoform
1.052 µg/L
No EPA limit set
Main supplier: KAHUKU · 2,730 people · 2019
1/1 SYR4
TTHM
1.052 µg/L 1.3%
of the EPA limit 80 µg/L
Main supplier: KAHUKU · 2,730 people · 2019
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: KAHUKU · 2,730 people · 2015
1/1 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 Kahuku

SupplierPopulation served
KAHUKU 2,730

Frequently asked questions about Kahuku tap water

Is Kahuku tap water safe to drink?

EPA testing detected 9 contaminants in the water serving Kahuku. 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 Kahuku?

1 public water supplier report drinking-water monitoring for Kahuku, Hawaii to the EPA. Each is listed above with its population served.

What contaminants are in Kahuku's water?

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