Is Waiohinu-Naalehu Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Hawaii

Compliance record

No violations on file. The EPA has no formal drinking-water violations recorded for this supplier.

Other contaminants detected

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 this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Copper	824 µg/L 63% of the EPA limit 1300 µg/L worst single sample: 986 µg/L	19/43	SYR4	2013–2018
Nitrate	510 µg/L 5.1% of the EPA limit 10000 µg/L	12/32	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	7/7	LCR	2022
Nitrate-Nitrite	502.5 µg/L 5% of the EPA limit 10000 µg/L worst single sample: 510 µg/L	6/16	SYR4	2012–2019
Chromium	2.8285 µg/L 2.8% of the EPA limit 100 µg/L worst single sample: 2.84 µg/L	2/4	SYR4	2014–2017
Bromodichloromethane	0.5200 µg/L No EPA limit set	1/7	SYR4	2013–2019
Bromoform	0.6800 µg/L No EPA limit set	1/7	SYR4	2013–2019
Dibromochloromethane	1.1 µg/L No EPA limit set	1/7	SYR4	2013–2019
Fluoride	210 µg/L 5.3% of the EPA limit 4000 µg/L	1/16	SYR4	2012–2019
TTHM	2.3 µg/L 2.9% of the EPA limit 80 µg/L	1/7	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	1.1 µg/L 1.8% of the EPA limit 60 µg/L	1/7	SYR4	2013–2019
Trichloroacetic Acid	1.1 µg/L No EPA limit set	1/7	SYR4	2013–2019

70 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UGross Beta Particle ActivityHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: OKAMOTO, KEITH K.
Phone: 808-961-8050

Frequently asked questions about Waiohinu-Naalehu

Is Waiohinu-Naalehu tap water safe to drink?

EPA monitoring detected 12 contaminants in Waiohinu-Naalehu's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Waiohinu-Naalehu's water?

EPA monitoring detected Copper, Nitrate, Lead, Nitrate-Nitrite, Chromium, and others. The full list with the level and data source for each is above.

How many people does Waiohinu-Naalehu serve?

Waiohinu-Naalehu reports serving 2,948 people in Hawaii, per its EPA record.

Has Waiohinu-Naalehu had any water quality violations?

The EPA has no formal drinking-water violations on file for Waiohinu-Naalehu.

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.