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Tap water quality report

Waipahu-Ewa-Waianae

EPA monitoring tested this supplier for 114 contaminants and detected 22. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

114
contaminants tested
22
detected
217,479
people served
0
health-based violations
Hawaii rankingsLead in HawaiiPFAS in Hawaii
Water source
Ground water
Ownership
Local 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.

0
health-based violations
14
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2012-01-01 → 2012-12-31
MR Monitoring Resolved 2012-01-01 → 2012-12-31
MR Monitoring Resolved 2012-01-01 → 2012-12-31
MR Monitoring Resolved 2012-01-01 → 2012-12-31
MR Monitoring Resolved 2012-01-01 → 2012-12-31
MR Monitoring Resolved 2012-01-01 → 2012-12-31
MR Monitoring Resolved 2011-01-01 → 2011-12-31
MR Monitoring Resolved 2011-01-01 → 2011-12-31
MR Monitoring Resolved 2011-01-01 → 2011-12-31
MR Monitoring Resolved 2011-01-01 → 2011-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfpea 0.0033 µg/L 1/34 2023

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
Nitrate
5000 µg/L 50%
of the EPA limit 10000 µg/L
worst single sample: 5300 µg/L
634/634 SYR4 2012–2019
Fluoride
248 µg/L 6.2%
of the EPA limit 4000 µg/L
worst single sample: 280 µg/L
285/290 SYR4 2012–2019
Nitrate-Nitrite
4900 µg/L 49%
of the EPA limit 10000 µg/L
worst single sample: 5300 µg/L
276/276 SYR4 2012–2019
TTHM
4.925 µg/L 6.2%
of the EPA limit 80 µg/L
worst single sample: 36 µg/L
128/199 SYR4 2012–2019
Bromoform
4.42 µg/L
No EPA limit set
worst single sample: 29 µg/L
127/198 SYR4 2012–2019
Copper
85 µg/L 6.5%
of the EPA limit 1300 µg/L
worst single sample: 430 µg/L
45/60 SYR4 2013–2019
Barium
4.785 µg/L 0.2%
of the EPA limit 2000 µg/L
worst single sample: 10 µg/L
42/60 SYR4 2013–2019
Chromium
9.05 µg/L 9.1%
of the EPA limit 100 µg/L
worst single sample: 10 µg/L
40/60 SYR4 2013–2019
Lead
3.91 µg/L 26%
of the EPA limit 15 µg/L
worst single sample: 4.9 µg/L
12/60 SYR4 2013–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 11/11 LCR 2018
Dibromochloromethane
3.97 µg/L
No EPA limit set
worst single sample: 4.9 µg/L
7/198 SYR4 2012–2019
Gross Beta Particle Activity
3.98 pCi/L
No EPA limit set
worst single sample: 4.04 pCi/L
6/40 SYR4 2013–2019
1,2-DIBROMO-3-CHLOROPROPANE
0.0290 µg/L 14%
of the EPA limit 0.2000 µg/L
worst single sample: 0.0300 µg/L
5/294 SYR4 2012–2019
Bromodichloromethane
2.76 µg/L
No EPA limit set
worst single sample: 3 µg/L
4/199 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
0.3760 pCi/L 2.5%
of the EPA limit 15 pCi/L
worst single sample: 0.4000 pCi/L
4/39 SYR4 2013–2018
Selenium
7.605 µg/L 15%
of the EPA limit 50 µg/L
worst single sample: 7.8 µg/L
4/60 SYR4 2013–2019
Chloroform
17.22 µg/L
No EPA limit set
worst single sample: 19 µg/L
3/199 SYR4 2012–2019
Dibromoacetic Acid
1 µg/L
No EPA limit set
 1/93 SYR4 2012–2019
Dichloroacetic Acid
1.2 µg/L
No EPA limit set
 1/93 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
3.2 µg/L 5.3%
of the EPA limit 60 µg/L
 1/94 SYR4 2012–2019
Trichloroacetic Acid
1 µg/L
No EPA limit set
 1/93 SYR4 2012–2019
92 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
KAWATA, ERWIN
Phone
808-748-5080
Email
[email protected]

Frequently asked questions about Waipahu-Ewa-Waianae

Is Waipahu-Ewa-Waianae tap water safe to drink?

EPA monitoring detected 22 contaminants in Waipahu-Ewa-Waianae'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 Waipahu-Ewa-Waianae's water?

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

How many people does Waipahu-Ewa-Waianae serve?

Waipahu-Ewa-Waianae reports serving 217,479 people in Hawaii, per its EPA record.

Has Waipahu-Ewa-Waianae had any water quality violations?

The EPA has 14 violations on file for Waipahu-Ewa-Waianae, of which 0 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.