County · Hawaii

Maui County, Hawaii: drinking water records

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

Explore EPA records for 35 community water systems across 14 ZIP codes in Maui County, then find water-testing resources and available recent monitoring-station readings.

In focus35Community 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 9 of the 35 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 35 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	Health-based violations	Lead, 9 in 10 homes at or below
Makawao HI0000213	29,868	300	1	0.9 ppbbelow the action level
Wailuku HI0000212	74,511	720	0	0 ppbbelow the action level
Lahaina HI0000214	20,065	575	0	0.8 ppbbelow the action level
Kaanapali HI0000205	8,000	120	0	0 ppbbelow the action level
Upper Kula HI0000215	7,686	120	0	1.7 ppbbelow the action level
Kapalua HI0000204	4,200	60	0	0 ppbbelow the action level
Kaunakakai HI0000234	3,702	60	0	0.8 ppbbelow the action level
Lower Kula HI0000247	3,522	120	0	3.7 ppbbelow the action level
Keanae HI0000219	270	60	0	0.7 ppbbelow the action level
Lanai City HI0000237	3,200	0	0	0 ppbbelow the action level
Hoolehua HI0000230	2,400	0	0	0 ppbbelow the action level
Hana HI0000217	1,284	0	0	0 ppbbelow the action level
Haleakala National Park HI0000222	1,200	0	0	0 ppbbelow the action level
Ualapue HI0000233	1,119	0	0	1 ppbbelow the action level
Maunaloa-Kaluakoi HI0000231	1,000	0	0	0 ppbbelow the action level
Hana Water Systems - South HI0000201	816	0	0	0 ppbbelow the action level
Mahanalua Nui Subdivison HI0000251	606	0	0	0 ppbbelow the action level
Kawela Plantation HI0000248	553	0	0	0 ppbbelow the action level
Kualapuu HI0000229	500	0	0	0 ppbbelow the action level
Kalae HI0000235	360	0	0	1 ppbbelow the action level
Hana Water Systems - North HI0000243	160	0	0	0 ppbbelow the action level
Kahakuloa Water Co. HI0000249	150	0	0	0 ppbbelow the action level
Kalaupapa Nhp HI0000239	110	0	0	0 ppbbelow the action level
Nahiku HI0000220	107	0	0	0 ppbbelow the action level
Maunaolu Plantation HI0000254	100	0	0	0 ppbbelow the action level
Olowalu HI0000209	100	0	0	0 ppbbelow the action level
Kailua HI0000203	90	0	0	0 ppbbelow the action level
Kipu HI0000245	80	0	0	9.3 ppbbelow the action level
Kula Nani HI0000255	80	0	0	0 ppbbelow the action level
West Kuiaha Meadows HI0000252	60	0	0	0 ppbbelow the action level
Honokohau HI0000218	42	0	0	0 ppbbelow the action level
Baldwin Ranch Estates HI0000266	32	0	0	0 ppbbelow the action level
Maui Highlands HI0000256	26	0	0	0 ppbbelow the action level
Haiku Town Water Association, INC. HI0000263	20	0	0	0 ppbbelow the action level
Hoku'Ula Water System HI0000267	1,000	0	0	not reported

USGS · Monitoring stations

The water, more recently.

Available station readings in Maui 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 Maui County

14ZIP 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

Haiku-Pauwela
Hana
Kahului
Kaunakakai
Kihei
Kualapuu
Kula
Lahaina
Lanai City
Olinda
Paia
Waikapu

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

96708Haiku-Pauwela
96713Hana
96729Kualapuu
96732Kahului
96748Kaunakakai
96753Kihei
96757Kualapuu
96761Lahaina
96763Lanai City
96768Olinda
96770Kualapuu
96779Paia
96790Kula
96793Waikapu

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.

PFASReading PFAS survey resultsWhat a detection, a reporting level and a yearly average mean in EPA’s PFAS survey records.LeadChoosing a lead filter11 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 Maui 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.