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Honolulu-Windward-Pearlharbor, HI

EPA monitoring detected 23 contaminants across the 1 water supplier serving Honolulu-Windward-Pearlharbor. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

1
water supplier
631,389
people served
23
contaminants found
Hawaii rankings Lead in Hawaii PFAS in Hawaii

What was found in Honolulu-Windward-Pearlharbor's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
2400 µg/L 24%
of the EPA limit 10000 µg/L
 1/1 SYR4
Nitrate-Nitrite
2400 µg/L 24%
of the EPA limit 10000 µg/L
 1/1 SYR4
Copper
180 µg/L 14%
of the EPA limit 1300 µg/L
 1/1 SYR4
Fluoride
84 µg/L 2.1%
of the EPA limit 4000 µg/L
 1/1 SYR4
Barium
20 µg/L 1%
of the EPA limit 2000 µg/L
 1/1 SYR4
Bromoform
17 µg/L
No EPA limit set
 1/1 SYR4
TTHM
17 µg/L 21%
of the EPA limit 80 µg/L
 1/1 SYR4
Selenium
8 µg/L 16%
of the EPA limit 50 µg/L
 1/1 SYR4
Chromium
6.1 µg/L 6.1%
of the EPA limit 100 µg/L
 1/1 SYR4
Gross Alpha, Excl. Radon And U
5.4 pCi/L 36%
of the EPA limit 15 pCi/L
 1/1 SYR4
Gross Beta Particle Activity
5.4 pCi/L
No EPA limit set
 1/1 SYR4
Di(2-ethylhexyl) Phthalate
3.8 µg/L 63%
of the EPA limit 6 µg/L
 1/1 SYR4
Lead
2.5 µg/L 17%
of the EPA limit 15 µg/L
 1/1 SYR4
Combined Uranium
2.086 µg/L 7%
of the EPA limit 30 µg/L
 1/1 SYR4
Arsenic
1.8 µg/L 18%
of the EPA limit 10 µg/L
 1/1 SYR4
Dibromochloromethane
1.6 µg/L
No EPA limit set
 1/1 SYR4
Antimony, Total
1.5 µg/L 25%
of the EPA limit 6 µg/L
 1/1 SYR4
Dibromoacetic Acid
1.5 µg/L
No EPA limit set
 1/1 SYR4
Dichloroacetic Acid
1.3 µg/L
No EPA limit set
 1/1 SYR4
Chlordane
0.6000 µg/L 30%
of the EPA limit 2 µg/L
 1/1 SYR4
Heptachlor Epoxide
0.0280 µg/L 14%
of the EPA limit 0.2000 µg/L
 1/1 SYR4
PFHXS
0.0030 µg/L
No EPA limit set
 1/1 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 1/1 LCR
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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Honolulu-Windward-Pearlharbor

SupplierPopulation served
HNL-WINDWARD-PEARL HARBOR 631,389

Frequently asked questions about Honolulu-Windward-Pearlharbor tap water

Is Honolulu-Windward-Pearlharbor tap water safe to drink?

EPA testing detected 23 contaminants in the water serving Honolulu-Windward-Pearlharbor. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Honolulu-Windward-Pearlharbor?

1 public water supplier report drinking-water monitoring for Honolulu-Windward-Pearlharbor, Hawaii to the EPA. Each is listed above with its population served.

What contaminants are in Honolulu-Windward-Pearlharbor's water?

The contaminants EPA monitoring detected in Honolulu-Windward-Pearlharbor include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Barium. The full list, with the highest level found and the data source, is in the table above.

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.