Water Quality Report · Updated October 07, 2026
WAIPAHU-EWA-WAIANAE
WAIPAHU-EWA-WAIANAE delivers tap water graded A (86/100) by TapWaterSafety.org. The utility serves approximately 217,479 residents in WAIPAHU-EWA-WAIANAE, Hawaii using groundwater. The most significant water quality concerns are: Chromium (hexavalent) significantly above health guideline; 1,2,3-Trichloropropane significantly above health guideline; Nitrate significantly above health guideline; Arsenic detected. For questions, the utility can be reached at 808-748-5080.
Is WAIPAHU-EWA-WAIANAE tap water safe to drink?
WAIPAHU-EWA-WAIANAE delivers tap water that earns a grade of A (86/100) from TapWaterSafety.org — an excellent rating reflecting minimal contamination and full compliance with health guidelines.
The utility serves 217,479 residents in WAIPAHU-EWA-WAIANAE, drawing from groundwater.
Public testing data identifies 9 contaminants in this water above EWG's health-based guidelines, including: Chromium (hexavalent), 1,2,3-Trichloropropane, Nitrate, Arsenic, Nitrate and nitrite, Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Bromoform, Vanadium. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
EPA compliance record
Official U.S. EPA records for WAIPAHU-EWA-WAIANAE (system ID HI0000335) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Quick actions for WAIPAHU-EWA-WAIANAE residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for WAIPAHU-EWA-WAIANAE.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 2.04 ppb, 102x above the EWG health guideline of 0.02 ppb.
1,2,3-Trichloropropane significantly above health guideline
Moderate concern1,2,3-Trichloropropane detected at 0.0532 ppb, 76x above the EWG health guideline of 0.0007 ppb.
Nitrate significantly above health guideline
Moderate concernNitrate detected at 3.04 ppm, 22x above the EWG health guideline of 0.14 ppm.
Arsenic detected
Moderate concernArsenic detected at 0.0828 ppb.
Contact WAIPAHU-EWA-WAIANAE
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for WAIPAHU-EWA-WAIANAE
Filters matched to the specific contaminants in this water supply.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 86/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Chromium (hexavalent) Heavy metal |
2.04 ppb | 0.02 | — | — | — | — | — | 102× over |
| 1,2,3-Trichloropropane Other |
0.0532 ppb | 0.0007 | — | — | — | — | — | 76× over |
| Nitrate Inorganic |
3.04 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 22× over |
| Arsenic Heavy metal |
0.0828 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 21× over |
| Nitrate and nitrite Inorganic |
3.0 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 21× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
0.84 ppb | 0.06 | — | — | — | — | — | 14× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
1.03 ppb | 0.15 | 80.0 | 100 | — | — | — | 6.8× over |
| Bromoform Disinfection byproduct |
0.964 ppb | 0.5 | — | — | — | — | — | 1.9× over |
| Vanadium Other |
28.2 ppb | 21.0 | — | — | — | — | — | 1.3× over |
| Dibromochloromethane Disinfection byproduct |
0.0361 ppb | 0.1 | — | — | — | — | — | Below guideline |
| 1,2-Dibromo-3-chloropropane (DBCP) Other |
0.000247 ppb | 0.0017 | 0.2 | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
20.9 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
0.516 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Ethylene dibromide Other |
0.000113 ppb | 0.01 | 0.05 | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.488 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Barium Heavy metal |
2.46 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.097 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.113 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.149 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
1.66 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.162 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
WAIPAHU-EWA-WAIANAE service area
This water system serves 1 community in Honolulu County, Hawaii. Click any city for its dedicated tap water quality page.
Find the right filter for WAIPAHU-EWA-WAIANAE water
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