County · Hawaii

Honolulu County, Hawaii: drinking water records

Name: Drinking water records for Honolulu County, Hawaii
Creator: U.S. Environmental Protection Agency
License: https://www.usa.gov/government-works

Explore EPA records for 30 community water systems across 38 ZIP codes in Honolulu County, then find water-testing resources and available recent monitoring-station readings.

In focus30Community water systems

Public records. Clearer context.

Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages

Drinking-water records

EPA survey and compliance records are historical reports. UCMR 5 results are available for 18 of the 30 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.

systems in EPA's PFAS survey

systems where PFAS was found

systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses

systems that have reached the lead action level

systems with a health-based violation since 2016

System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.

Water systems in this county

All 30 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.

Water system	People served	PFAS survey results	PFAS found	Health-based violations	Lead, 9 in 10 homes at or below
Hnl-Windward-Pearl Harbor HI0000331	631,389	2,760	1	0	0 ppbbelow the action level
Waipahu-Ewa-Waianae HI0000335	217,479	1,020	1	0	0 ppbbelow the action level
Joint Base Pearl Harbor-Hickam HI0000360	65,230	60	0	0	0 ppbbelow the action level
Mililani HI0000367	50,573	180	0	0	0 ppbbelow the action level
Schofield Barracks HI0000345	37,920	60	0	0	0 ppbbelow the action level
Wahiawa HI0000333	23,348	120	0	0	0 ppbbelow the action level
Marine Corps Base Hawaii HI0000356	16,300	60	0	0	0 ppbbelow the action level
Waipio Heights HI0000334	11,516	120	0	0	0 ppbbelow the action level
Waialua-Haleiwa HI0000332	9,996	60	0	0	0 ppbbelow the action level
Fort Shafter HI0000341	7,067	60	0	0	0 ppbbelow the action level
Nctams Eastpac HI0000357	6,470	60	0	0	0 ppbbelow the action level
Aliamanu HI0000337	6,406	60	0	0	0 ppbbelow the action level
Laie Water Company HI0000325	5,577	120	0	0	0 ppbbelow the action level
Tripler Army Medical Cntr HI0000346	5,555	60	0	0	0 ppbbelow the action level
Barbers Point HI0000355	5,256	60	0	0	0 ppbbelow the action level
Waialee-Sunset Beach HI0000366	4,916	180	0	0	0 ppbbelow the action level
Kamehameha Schools HI0000319	4,000	120	0	0	0 ppbbelow the action level
The Queen'S Medical Center HI0000312	3,440	60	0	0	0 ppbbelow the action level
Waiawa Correctional Facility HI0000348	444	0	0	5	0 ppbbelow the action level
Waiahole HI0000368	300	0	0	1	0 ppbbelow the action level
Kahuku HI0000365	2,730	0	0	0	0 ppbbelow the action level
Dillingham Airfield HI0000338	1,800	0	0	0	0 ppbbelow the action level
Kunia Village HI0000303	650	0	0	0	0 ppbbelow the action level
Camp Stover HI0000354	595	0	0	0	0 ppbbelow the action level
Waialua Sugar Pump 2 HI0000309	400	0	0	0	0 ppbbelow the action level
Dillingham Ranch HI0000326	100	0	0	0	0 ppbbelow the action level
Kahuku Air Base HI0000315	75	0	0	0	0 ppbbelow the action level
Woodlands at Nuuanu HI0000372	48	0	0	0	0 ppbbelow the action level
Villa Rose HI0000374	30	0	0	1	not reported
Poamoho HI0000371	25	0	0	0	0 ppbbelow the action level

USGS · Monitoring stations

The water, more recently.

Available station readings in Honolulu County, Hawaii. Each measurement keeps its time, unit and original source.

These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.

Recent observations load when this section comes into view.

How these readings update

We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.

Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.

Your next step

Water testing, reports & local help.

Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.

Official national directories

Water testing

Find your state’s private-well program

EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-05

Water testing

Find a certified drinking-water laboratory

Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-11

Public records

Find your utility’s Consumer Confidence Report

EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-09-09

Public records

Explore USGS water observations

Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.

U.S. Geological Survey
Source reviewed 2026-09-15

A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.

Understand water testing and laboratory reports

Resource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction

Explore your area

Local coverage in Honolulu County

38ZIP areas in this overview

Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.

Towns and communities

Aiea
East Honolulu
East Kapolei
Hickam Housing
Kaaawa
Kahuku
Kailua
Kalaeloa
Kaneohe
Kaneohe Base
Laie
Mililani Town
Mokuleia
Pearl City
Punaluu
Pupukea
Royal Kunia
Schofield Barracks
Urban Honolulu
Wahiawa
Waianae
Waimanalo

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

96701Pearl City
96706East Kapolei
96707Kalaeloa
96712Pupukea
96717Punaluu
96730Kaaawa
96731Kahuku
96734Kailua
96744Kaneohe
96759
96762Laie
96782Pearl City
96786Wahiawa
96789Mililani Town
96791Mokuleia
96792Waianae
96795Waimanalo
96797Royal Kunia
96813Urban Honolulu
96814Urban Honolulu
96815Urban Honolulu
96816Urban Honolulu
96817Urban Honolulu
96818Hickam Housing
96819Urban Honolulu
96820Urban Honolulu
96821East Honolulu
96822Urban Honolulu
96825East Honolulu
96826Urban Honolulu
96848Urban Honolulu
96850Urban Honolulu
96853Hickam Housing
96857Schofield Barracks
96858Urban Honolulu
96859Urban Honolulu
96860Aiea
96863Kaneohe Base

These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.

Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.

Beyond this county page

Keep reading. Compare nearby.

PFASChoosing a PFAS filterPFAS was found in 2 of the 18 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter2 systems here have reached the lead action level. See how to check a filter’s lead-reduction certification.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.

Counties near Honolulu County

All Hawaii counties

Sources and scope

EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.

Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.

Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.