Tapcensus

California

Orange County drinking water quality

46 active public water systems serve 3,204,616 people in Orange County. 40 are compliant, 6 had at least one EPA violation in the past three years, 0 are designated serious violators, and 3 carry a health flag.

Active systems 46 40 community systems
People served 3.2M by public water systems
Systems with violations 6 13% of active systems, past 3 years
Serious violators 0 3 systems carry a health flag

Needs attention

Los Alamitos Race Course CA3000819 · Non-Transient non-community system · Serves 1,600 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Hynes Estates Mutual Water Co. CA3000519 · Community water system · Serves 168 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Liberty Park Water Association CA3000618 · Community water system · Serves 95 3 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).

Community water systems

40 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Irvine Ranch Water District
 450,323 0 0
City of Anaheim
Anaheim 		350,254 1 0
City of Santa Ana
Santa Ana 		316,184 0 0
City of Huntington Beach
Huntington Beach 		201,000 0 0
City of Garden Grove
Garden Grove 		174,226 0 0
Moulton Niguel Water District
 168,315 0 0
Santa Margarita Water District
 165,275 0 0
City of Fullerton
Fullerton 		140,054 0 0
City of Orange
Orange 		120,770 0 0
Golden State WC West Orange County
 114,693 0 0
Mesa Water District
 110,000 0 0
City of Westminster
Westminster 		93,591 0 0
Yorba Linda Water District
 84,292 0 0
City of Buena Park
Buena Park 		82,667 0 0
City of Newport Beach
Newport Beach 		69,520 0 0
City of Tustin
Tustin 		65,143 0 0
City of la Habra
La Habra 		61,202 0 0
City of Fountain Valley
Fountain Valley 		56,747 0 0
EL Toro Water District
 53,415 0 0
City of San Clemente
San Clemente 		51,545 0 0
Golden State WC Placentia/yorba Linda
 50,804 0 0
City of Brea
Brea 		47,454 0 0
South Coast Water District
 41,194 0 0
Santa Margarita Water District-Id9
San Juan Capistrano 		35,309 0 0
City of Seal Beach
Seal Beach 		24,937 0 0
Laguna Beach County WD
 18,862 0 0
City of la Palma
La Palma 		15,948 0 0
Trabuco Canyon Water District
 13,659 0 0
Golden State WC Cowan Heights
 7,006 0 0
Serrano Water District
 5,659 0 0
East Orange County WD RZ
 3,464 0 0
Eastside Water Association
 2,000 1 0
Midway City Mutual WC
Midway City 		1,305 0 0
South Midway City Mutual Water Co.
Midway City 		891 0 0
Hynes Estates Mutual Water Co.
 168 1 1
Page Avenue Mutual Water Company
 119 2 0
Liberty Park Water Association
 95 3 1
East Orange County WD WZ
 0 0 0
Joint Regional Water Supply System
 0 0 0
Smwd SJ Ground Water Plant
 0 0 0
Non-community systems (6: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Knott's Berry Farm
 3,000 0 0
Los Alamitos Race Course
 1,600 1 1
Smwd-Nichols Institute
 1,600 0 0
Caspers Regional Wilderness Park
 239 0 0
Lazy W Ranch Water System
 63 0 0
Canyon RV Park
 24 0 0
Inactive systems (121, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.