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Tap water quality report

Waiahole

EPA monitoring tested this supplier for 80 contaminants and detected 5. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

80
contaminants tested
5
detected
300
people served
3
health-based violations
Hawaii rankingsLead in HawaiiPFAS in Hawaii
Water source
Ground water
Ownership
State government
Counties served
Honolulu

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.

3
health-based violations
7
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2020-01-01 → 2020-01-31
MCL Health-based Resolved 2020-01-01 → 2020-01-31
MCL Health-based Resolved 2020-01-01 → 2020-01-31
MR Monitoring Resolved 2020-02-01
MR Monitoring Resolved 2020-02-01
MR Monitoring Resolved 2020-02-01
MR Monitoring Archived 2000-01-01 → 2003-12-08

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 4/4 LCR 2021
Nitrate
680 µg/L 6.8%
of the EPA limit 10000 µg/L
 2/18 SYR4 2012–2019
Bromoform
1.3 µg/L
No EPA limit set
 1/3 SYR4 2013–2019
Nitrate-Nitrite
680 µg/L 6.8%
of the EPA limit 10000 µg/L
 1/8 SYR4 2012–2019
TTHM
1.3 µg/L 1.6%
of the EPA limit 80 µg/L
 1/3 SYR4 2013–2019
75 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 UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateGross Alpha, Excl. Radon And UGross Beta Particle ActivityHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
PRAHLER, RICHARD

Frequently asked questions about Waiahole

Is Waiahole tap water safe to drink?

EPA monitoring detected 5 contaminants in Waiahole'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 Waiahole's water?

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

How many people does Waiahole serve?

Waiahole reports serving 300 people in Hawaii, per its EPA record.

Has Waiahole had any water quality violations?

The EPA has 7 violations on file for Waiahole, of which 3 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.