County · California

Orange County, California: drinking water records

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

Explore EPA records for 40 community water systems across 88 ZIP codes in Orange County, then find water-testing resources and available recent monitoring-station readings.

In focus40Community 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 30 of the 40 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 40 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
City of Fullerton CA3010010	139,461	505	8	1	1.5 ppbbelow the action level
Irvine Ranch Water District CA3010092	444,800	720	2	0	0 ppbbelow the action level
City of Anaheim CA3010001	348,593	1,195	7	0	0 ppbbelow the action level
City of Santa Ana CA3010038	310,539	835	5	0	0 ppbbelow the action level
City of Huntington Beach CA3010053	201,000	660	2	0	0 ppbbelow the action level
City of Garden Grove CA3010062	174,226	775	6	0	0 ppbbelow the action level
Moulton Niguel Water District CA3010073	170,236	240	0	0	0 ppbbelow the action level
Santa Margarita Water District CA3010101	168,289	240	0	0	0 ppbbelow the action level
City of Orange CA3010027	120,770	895	7	0	2.3 ppbbelow the action level
Golden State Wc - West Orange County CA3010022	114,379	720	5	0	2.2 ppbbelow the action level
Mesa Water District CA3010004	110,000	575	0	0	0 ppbbelow the action level
City of Westminster CA3010064	90,911	660	2	0	4.7 ppbbelow the action level
Yorba Linda Water District CA3010037	84,292	300	2	0	0 ppbbelow the action level
City of Buena Park CA3010003	81,998	600	2	0	0 ppbbelow the action level
City of Newport Beach CA3010023	68,572	180	0	0	0 ppbbelow the action level
City of Tustin CA3010046	66,600	420	3	0	0 ppbbelow the action level
City of la Habra CA3010018	63,118	210	0	0	0 ppbbelow the action level
City of Fountain Valley CA3010069	56,747	480	1	0	6 ppbbelow the action level
El Toro Water District CA3010079	51,800	455	1	0	0.8 ppbbelow the action level
City of San Clemente CA3010036	51,545	240	0	0	0 ppbbelow the action level
Golden State Wc - Placentia/Yorba Linda CA3010035	50,381	300	7	0	2.5 ppbbelow the action level
City of Brea CA3010002	48,479	300	0	0	0 ppbbelow the action level
South Coast Water District CA3010042	41,118	240	1	0	0 ppbbelow the action level
Santa Margarita Water District-Id9 CA3010030	39,684	300	0	0	0 ppbbelow the action level
City of Seal Beach CA3010041	24,937	300	0	0	0 ppbbelow the action level
Laguna Beach County WD CA3010017	18,404	240	0	0	0 ppbbelow the action level
City of la Palma CA3010100	15,948	240	0	0	4.1 ppbbelow the action level
Trabuco Canyon Water District CA3010094	13,659	185	0	0	3.9 ppbbelow the action level
Golden State Wc - Cowan Heights CA3010047	6,997	180	2	0	8.4 ppbbelow the action level
Serrano Water District CA3010082	5,659	180	2	0	0 ppbbelow the action level
Hynes Estates Mutual Water Co. CA3000519	168	0	0	1	0 ppbbelow the action level
Liberty Park Water Association CA3000618	85	0	0	4	0 ppbbelow the action level
Joint Regional Water Supply System CA3010071	3,947	0	0	0	5.9 ppbbelow the action level
East Orange County WD - Rz CA3010068	3,464	0	0	0	5.5 ppbbelow the action level
Eastside Water Association CA3010008	2,000	0	0	0	0 ppbbelow the action level
Midway City Mutual Wc CA3010097	1,305	0	0	0	0 ppbbelow the action level
South Midway City Mutual Water Co. CA3000825	891	0	0	0	0 ppbbelow the action level
Page Avenue Mutual Water Company CA3000585	119	0	0	0	0 ppbbelow the action level
East Orange County WD - Wz CA3010093	0	0	0	0	not reported
Smwd - Sj Ground Water Plant CA3010120	0	0	0	0	not reported

USGS · Monitoring stations

The water, more recently.

Available station readings in Orange County, California. 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 Orange County

88ZIP 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

Aliso Viejo
Anaheim
Brea
Buena Park
Costa Mesa
Coto de Caza
Cypress
Dana Point
Fountain Valley
Fullerton
Garden Grove
Huntington Beach
Irvine
La Habra
La Palma
Laguna Beach
Laguna Hills
Laguna Niguel
Laguna Woods
Lake Forest
Los Alamitos
Midway City
Mission Viejo
Newport Beach
North Tustin
Orange
Placentia
Rancho Mission Viejo
Rancho Santa Margarita
San Clemente
San Juan Capistrano
Santa Ana
Seal Beach
Silverado
Stanton
Trabuco Canyon
Tustin
Villa Park
Westminster
Yorba Linda

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

90620Buena Park
90621Buena Park
90623La Palma
90630Cypress
90631La Habra
90680Stanton
90720Los Alamitos
90740Seal Beach
90742Huntington Beach
90743Seal Beach
92602Irvine
92603Irvine
92604Irvine
92606Irvine
92610Lake Forest
92612Irvine
92614Irvine
92617Irvine
92618Irvine
92620Irvine
92624Dana Point
92625Newport Beach
92626Costa Mesa
92627Costa Mesa
92629Dana Point
92630Lake Forest
92637Laguna Woods
92646Huntington Beach
92647Huntington Beach
92648Huntington Beach
92649Huntington Beach
92651Laguna Beach
92653Laguna Hills
92655Midway City
92656Aliso Viejo
92657Newport Beach
92660Newport Beach
92661Newport Beach
92662Newport Beach
92663Newport Beach
92673San Clemente
92675San Juan Capistrano
92676Silverado
92677Laguna Niguel
92678Trabuco Canyon
92679Coto de Caza
92683Westminster
92688Rancho Santa Margarita
92691Mission Viejo
92692Mission Viejo
92694Rancho Mission Viejo
92697Irvine
92701Santa Ana
92703Santa Ana
92704Santa Ana
92705North Tustin
92706Santa Ana
92707Santa Ana
92708Fountain Valley
92780Tustin
92782Tustin
92801Anaheim
92802Anaheim
92804Anaheim
92805Anaheim
92806Anaheim
92807Anaheim
92808Anaheim
92821Brea
92823Brea
92831Fullerton
92832Fullerton
92833Fullerton
92835Fullerton
92840Garden Grove
92841Garden Grove
92843Garden Grove
92844Garden Grove
92845Garden Grove
92861Villa Park
92865Orange
92866Orange
92867Orange
92868Orange
92869Orange
92870Placentia
92886Yorba Linda
92887Yorba Linda

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 18 of the 30 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter4 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 Orange County

All California 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.