Is Waialua-Haleiwa, HI Tap Water Safe? Quality & Contaminants

What was found in Waialua-Haleiwa'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.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	3885 µg/L 39% of the EPA limit 10000 µg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2019 Highest in the city: 4407.5 µg/L — WAIALUA SUGAR PUMP 2 · 400 people · 2019	3/4	SYR4
Nitrate-Nitrite	3765 µg/L 38% of the EPA limit 10000 µg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2019 Highest in the city: 4400 µg/L — WAIALUA SUGAR PUMP 2 · 400 people · 2019	3/4	SYR4
Copper	17.95 µg/L 1.4% of the EPA limit 1300 µg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2017 Highest in the city: 383.8 µg/L — WAIALUA SUGAR PUMP 2 · 400 people · 2018	3/4	SYR4
Fluoride	155 µg/L 3.9% of the EPA limit 4000 µg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2019	2/4	SYR4
Selenium	6.7 µg/L 13% of the EPA limit 50 µg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2017	1/4	SYR4
TTHM	3.71 µg/L 4.6% of the EPA limit 80 µg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2019 Highest in the city: 6.29 µg/L — DILLINGHAM RANCH · 100 people · 2017	2/4	SYR4
Bromoform	3.385 µg/L No EPA limit set Main supplier: WAIALUA-HALEIWA · 9,996 people · 2019 Highest in the city: 4.81 µg/L — DILLINGHAM RANCH · 100 people · 2017	2/4	SYR4
Barium	2.84 µg/L 0.1% of the EPA limit 2000 µg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2017	1/4	SYR4
Monobromoacetic Acid	2.5 µg/L No EPA limit set Highest in the city: DILLINGHAM RANCH · 100 people · 2017	1/4	SYR4
Total Haloacetic Acids (HAA5)	2.44 µg/L 4.1% of the EPA limit 60 µg/L Highest in the city: DILLINGHAM RANCH · 100 people · 2017	1/4	SYR4
Chromium	2.24 µg/L 2.2% of the EPA limit 100 µg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2017	3/4	SYR4
Dibromochloromethane	0.5200 µg/L No EPA limit set Main supplier: WAIALUA-HALEIWA · 9,996 people · 2019 Highest in the city: 1.49 µg/L — DILLINGHAM RANCH · 100 people · 2017	2/4	SYR4
Arsenic	1.4 µg/L 14% of the EPA limit 10 µg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2017	1/4	SYR4
Dibromoacetic Acid	1.3 µg/L No EPA limit set Highest in the city: DILLINGHAM RANCH · 100 people · 2017	1/4	SYR4
Trichloroethylene	0.8105 µg/L 16% of the EPA limit 5 µg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2019	1/4	SYR4
Picloram	0.1100 µg/L 0% of the EPA limit 500 µg/L Highest in the city: WAIALUA SUGAR PUMP 2 · 400 people · 2018	1/4	SYR4
1,2-DIBROMO-3-CHLOROPROPANE	0.0240 µg/L 12% of the EPA limit 0.2000 µg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2019	1/4	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: WAIALUA-HALEIWA · 9,996 people · 2018	3/4	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 Waialua-Haleiwa

Supplier	Population served
WAIALUA-HALEIWA	9,996
WAIALUA SUGAR PUMP 2	400
DILLINGHAM RANCH	100
VILLA ROSE	30

Frequently asked questions about Waialua-Haleiwa tap water

Is Waialua-Haleiwa tap water safe to drink?

EPA testing detected 18 contaminants in the water serving Waialua-Haleiwa. 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 Waialua-Haleiwa?

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

What contaminants are in Waialua-Haleiwa's water?

The contaminants EPA monitoring detected in Waialua-Haleiwa include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Selenium. 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.