Is Niulii Tap Water Safe? Quality Report

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

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	1992-10-31 → 1992-11-30
MCL	Health-based	Archived	1992-10-31 → 1992-11-30
MCL	Health-based	Archived	1992-10-31 → 1992-11-30
MCL	Health-based	Archived	1992-10-31 → 1992-11-30

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
Nitrate	360 µg/L 3.6% of the EPA limit 10000 µg/L	16/16	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	8/8	LCR	2023
Nitrate-Nitrite	356.5 µg/L 3.6% of the EPA limit 10000 µg/L worst single sample: 360 µg/L	8/8	SYR4	2012–2019
Bromoform	4.89 µg/L No EPA limit set worst single sample: 5 µg/L	3/3	SYR4	2013–2019
TTHM	5.27 µg/L 6.6% of the EPA limit 80 µg/L worst single sample: 5.3 µg/L	3/3	SYR4	2013–2019
Dibromochloromethane	1.495 µg/L No EPA limit set worst single sample: 1.5 µg/L	2/3	SYR4	2013–2019
Dibromoacetic Acid	1.2 µg/L No EPA limit set	1/3	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	1.2 µg/L 2% of the EPA limit 60 µg/L	1/3	SYR4	2013–2019

73 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, TotalArsenicAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateGross Alpha, Excl. Radon And UGross Beta Particle ActivityHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

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

Frequently asked questions about Niulii

Is Niulii tap water safe to drink?

EPA monitoring detected 8 contaminants in Niulii'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 Niulii's water?

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

How many people does Niulii serve?

Niulii reports serving 254 people in Hawaii, per its EPA record.

Has Niulii had any water quality violations?

The EPA has 4 violations on file for Niulii, of which 4 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.