Is Mahanalua Nui Subdivison Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Private
Counties served: Maui

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
Nitrate	2700 µg/L 27% of the EPA limit 10000 µg/L worst single sample: 3000 µg/L	42/44	SYR4	2012–2019
Nitrate-Nitrite	2700 µg/L 27% of the EPA limit 10000 µg/L worst single sample: 3000 µg/L	21/22	SYR4	2012–2019
Copper	143.5 µg/L 11% of the EPA limit 1300 µg/L worst single sample: 160 µg/L	12/47	SYR4	2012–2019
TTHM	30.385 µg/L 38% of the EPA limit 80 µg/L worst single sample: 31.4 µg/L	8/8	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	5.965 µg/L 9.9% of the EPA limit 60 µg/L worst single sample: 7.4 µg/L	8/8	SYR4	2012–2019
Bromoform	27.81 µg/L No EPA limit set worst single sample: 30 µg/L	7/7	SYR4	2012–2019
Dibromoacetic Acid	5.47 µg/L No EPA limit set worst single sample: 6.4 µg/L	7/7	SYR4	2012–2019
Dibromochloromethane	5.18 µg/L No EPA limit set worst single sample: 5.8 µg/L	5/7	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	5/5	LCR	2021
Chromium	3.0185 µg/L 3% of the EPA limit 100 µg/L worst single sample: 3.05 µg/L	4/6	SYR4	2014–2019
Fluoride	228.5 µg/L 5.7% of the EPA limit 4000 µg/L worst single sample: 230 µg/L	4/21	SYR4	2012–2019
Gross Beta Particle Activity	6.81 pCi/L No EPA limit set worst single sample: 6.9 pCi/L	4/6	SYR4	2016–2019
Lead	9.11 µg/L 61% of the EPA limit 15 µg/L	1/47	SYR4	2012–2019
Monobromoacetic Acid	1.7 µg/L No EPA limit set	1/7	SYR4	2012–2019
Trichloroacetic Acid	1 µg/L No EPA limit set	1/7	SYR4	2012–2019

66 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, TotalBromodichloromethaneChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneMercuryMethoxychlorMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: TAMAYOSE, LEA
Phone: 808-877-4202
Email: [email protected]

Frequently asked questions about Mahanalua Nui Subdivison

Is Mahanalua Nui Subdivison tap water safe to drink?

EPA monitoring detected 15 contaminants in Mahanalua Nui Subdivison'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 Mahanalua Nui Subdivison's water?

EPA monitoring detected Nitrate, Nitrate-Nitrite, Copper, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Mahanalua Nui Subdivison serve?

Mahanalua Nui Subdivison reports serving 606 people in Hawaii, per its EPA record.

Has Mahanalua Nui Subdivison had any water quality violations?

The EPA has no formal drinking-water violations on file for Mahanalua Nui Subdivison.

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.