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Tap water quality report

Waikoloa

EPA monitoring tested this supplier for 114 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

114
contaminants tested
16
detected
12,100
people served
9
health-based violations
Hawaii rankingsLead in HawaiiPFAS in Hawaii
Water source
Ground water
Ownership
Private
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.

9
health-based violations
14
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2010-02-01 → 2010-02-28
MCL Health-based Resolved 2010-02-01 → 2010-02-28
MCL Health-based Resolved 2010-02-01 → 2010-02-28
MCL Health-based Archived 2000-01-01 → 2000-01-31
MCL Health-based Archived 2000-01-01 → 2000-01-31
MCL Health-based Archived 2000-01-01 → 2000-01-31
MCL Health-based Archived 2000-01-01 → 2000-01-31
MCL Health-based Archived 2000-01-01 → 2000-01-31
MCL Health-based Archived 2000-01-01 → 2000-01-31
MR Monitoring Resolved 2010-03-01

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
1315 µg/L 13%
of the EPA limit 10000 µg/L
worst single sample: 1400 µg/L
38/38 SYR4 2012–2019
Nitrate-Nitrite
1310 µg/L 13%
of the EPA limit 10000 µg/L
worst single sample: 1400 µg/L
19/19 SYR4 2012–2019
Bromoform
7.32 µg/L
No EPA limit set
worst single sample: 7.4 µg/L
17/17 SYR4 2012–2019
Fluoride
404 µg/L 10%
of the EPA limit 4000 µg/L
worst single sample: 420 µg/L
17/17 SYR4 2013–2019
TTHM
8.64 µg/L 11%
of the EPA limit 80 µg/L
worst single sample: 8.8 µg/L
17/17 SYR4 2012–2019
Dibromochloromethane
1.335 µg/L
No EPA limit set
worst single sample: 1.4 µg/L
14/17 SYR4 2012–2019
Dibromoacetic Acid
1.445 µg/L
No EPA limit set
worst single sample: 1.5 µg/L
12/17 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
2.7 µg/L 4.5%
of the EPA limit 60 µg/L
 12/17 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 11/11 LCR 2021
Chromium
4.562 µg/L 4.6%
of the EPA limit 100 µg/L
worst single sample: 4.58 µg/L
7/7 SYR4 2013–2017
Copper
58.65 µg/L 4.5%
of the EPA limit 1300 µg/L
worst single sample: 60 µg/L
4/100 SYR4 2012–2018
Gross Beta Particle Activity
4.74 pCi/L
No EPA limit set
worst single sample: 4.8 pCi/L
4/7 SYR4 2013–2014
Dichloroacetic Acid
1 µg/L
No EPA limit set
 2/17 SYR4 2012–2019
Lead
9.3575 µg/L 62%
of the EPA limit 15 µg/L
worst single sample: 9.8 µg/L
2/100 SYR4 2012–2018
Monobromoacetic Acid
1.295 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
2/17 SYR4 2012–2019
Barium
3.9 µg/L 0.2%
of the EPA limit 2000 µg/L
 1/5 SYR4 2013–2017
98 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
CARRASCO, TONY
Phone
808-883-2065
Email
[email protected]

Frequently asked questions about Waikoloa

Is Waikoloa tap water safe to drink?

EPA monitoring detected 16 contaminants in Waikoloa'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 Waikoloa's water?

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

How many people does Waikoloa serve?

Waikoloa reports serving 12,100 people in Hawaii, per its EPA record.

Has Waikoloa had any water quality violations?

The EPA has 14 violations on file for Waikoloa, of which 9 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.