Tapcensus

California

San Joaquin County drinking water quality

306 active public water systems serve 794,026 people in San Joaquin County. 237 are compliant, 69 had at least one EPA violation in the past three years, 0 are designated serious violators, and 21 carry a health flag.

Active systems 306 93 community systems
People served 794K by public water systems
Systems with violations 69 23% of active systems, past 3 years
Serious violators 0 21 systems carry a health flag

Needs attention

Harney Lane Migrant Center WS CA3900581 · Non-Transient non-community system · Serves 500 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Jefferson Esd-Jefferson School CA3901107 · Non-Transient non-community system · Serves 483 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Alpine Meats INC CA3901080 · Non-Transient non-community system · Serves 270 2 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Pacific Bell Ue17l Water System CA3901086 · Non-Transient non-community system · Serves 150 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Valpico Industrial Park CA3901409 · Non-Transient non-community system · Serves 150 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Glassfab Tempering Services Inc. CA3901309 · Non-Transient non-community system · Serves 125 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Plug Connection Lodi CA3901278 · Non-Transient non-community system · Serves 102 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Glenwood Mobile Home Park CA3900649 · Community water system · Serves 100 2 rules violated in the past three years. Unresolved: Consumer Confidence Rule (CCR) and Lead and Copper Rule Revisions (LCRR).
A1 Winstons Mobile Home Park CA3900606 · Community water system · Serves 75 2 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Western Pallet Supply & Logistics CA3901336 · Non-Transient non-community system · Serves 60 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).

11 more systems with a serious violator or health flag designation are in the lists below.

Community water systems

93 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
City of Stockton
Stockton 		192,702 2 0
California Water Service Stockton
 182,775 0 0
Tracy, City of
Tracy 		98,215 0 0
Manteca, City of
Manteca 		84,928 1 0
Lodi, City of
Lodi 		67,093 0 0
City of Lathrop
Lathrop 		38,596 0 0
City of Mountain House
 26,400 0 0
Ripon, City of
Ripon 		15,753 0 0
Escalon, City of
Escalon 		7,232 0 0
San Joaquin County Lincoln Village
 5,841 0 0
San Joaquin County-Mokelumne Acres
 3,802 0 0
Lockeford Community Serv. Dist.
 3,572 0 0
Cdcr California Health Care Facility
Stockton 		2,186 0 0
San Joaquin County Colonial Heights
 1,841 0 0
Linden County Water District
 1,784 0 0
Oakwood Lake Water District-Subdivision
 1,640 0 0
Fairoaks PWS #44
 1,172 0 0
San Joaquin County-Raymus Village
 1,086 1 0
San Joaquin County Thornton
 964 0 0
San Joaquin County Wilkinson Manor
 851 0 0
Stockton Verde Mobile Home Park
 703 0 0
San Joaquin River Club INC
 600 0 0
Little Potato Slough Mutual
 560 0 0
Morada Estates N PWS #46
 426 0 0
Arbor Mobile Home Park WS
 340 0 0
Bel Air Mobile Estate
 325 0 0
Double L Mobile Estates
 320 0 0
Santos Ranch PWS #5-Csa #35
 320 0 0
San Joaquin Water Works #2
 310 0 0
Morehead Park
 300 2 1
Sahara Mobile Court
 300 0 0
Morada Estates PWS
 290 0 0
Mapache Trailer Park
 275 0 0
Farmington Water Company
 270 0 0
Clements Water Works #43
 264 0 0
Shaded Terrace PWS
 238 0 0
Twin Oaks Mobile Park
 238 0 0
Elkhorn Estates Water System
 234 0 0
Acampo Water System
 231 0 0
San Juan Vista
 201 0 0
King Island Trailer Park Water System
 200 0 0
Tahama Village Mobile Home Park
 200 0 0
Villa Cerezos
 200 0 0
132 Investments Water System
 187 1 0
Caribou Mobile Park PWS
 180 0 0
Gayla Manor PWS
 178 0 0
Par Country Estates Csa-16
 178 0 0
Rancho San Joaquin Water Sys
 172 0 0
IL Vineto
 160 0 0
Islander Marina
 150 0 0
Non-community systems (213: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
New 99 Speedway Water System
 10,000 0 0
Jimmys One Stop
 2,505 0 0
Defense Distrib. Depot Tracy Site
 1,249 0 0
Starbucks
 1,200 0 0
Family Market Water System
 1,105 0 0
Escalon Golf Course WS
 1,010 0 0
Horizon Christian Fellowship
 1,000 0 0
Jahant Food N Fuel Stop
 1,000 0 0
King Island Resort PWS
 1,000 0 0
Smk Chevron
 1,000 0 0
ST Marys High School
 953 0 0
Navarra Water System
 730 0 0
Musd-New Haven School
 626 1 0
Rodeway Inn
 600 0 0
Defense Distrib. Depot, Sharpe Site
 500 0 0
Harney Lane Migrant Center WS
 500 1 1
Jefferson Esd-Jefferson School
 483 1 1
Ripon Usd-Colony Oak School
 465 0 0
Delicato Vineyards
 430 0 0
Lodi Usd-Houston School
 405 0 0
Owens-Brockway Glass Container INC
 404 1 0
Wienerschnitzel
 400 0 0
Lodi Usd-Davis School
 389 1 0
Lodi Usd-Live Oak School
 375 0 0
Sutter Home Winery Inc.
 355 0 0
Oak View Union Elementary Sch
 350 0 0
Musco Family Olive CO
 348 1 0
Deshmesh Darbar Lodi/stk Water Sys
 308 0 0
Cherokee Memorial Park INC Water System
 300 0 0
Denny Boys Water System
 300 1 0
Escalon Premier Brands
 300 1 0
Franks One/stop Food Mart Water Sys
 300 0 0
Alpine Meats INC
 270 2 1
Lawrence Livermore National Lab-Site 300
 270 0 0
Franzia Winery
 250 0 0
Linden Usd-Waterloo Elementary
 225 0 0
Boething Treeland Farms INC
 222 0 0
FC Tracy Holdings, LLC
 219 0 0
New Jerusalem School
 210 0 0
Banta Elementary School
 200 0 0
Eusd-Van Allen School
 200 0 0
Morada Chevron Fast N Easy #60*
 200 0 0
Normans Nursery
 200 0 0
Paradise Point Marina
 200 0 0
Carnegie Svra
 186 0 0
Kellogg Garden Products
 185 0 0
Csp Caswell State Park
 182 0 0
Viejo Ltd
 163 0 0
Cbuso Dba Woodbridge Winery
 150 1 0
Collegeville Market & Cafe
 150 0 0
Pacific Bell Ue17l Water System
 150 1 1
ST Josephs Hospital
 150 0 0
Valpico Industrial Park
 150 1 1
Turtle Beach & Water System
 140 0 0
Flag City Water System
 135 0 0
Tracy Matrl Recvry/sld Waste WS
 130 0 0
Arp Minimart Corp WS
 125 0 0
Austin Industrial Park Water System
 125 1 0
Frank C Alegre Trucking INC WS
 125 0 0
Glassfab Tempering Services Inc.
 125 1 1
Van Groningen & Sons INC Water System
 125 0 0
Podesta Packing Water System
 123 0 0
Corti Water System
 120 0 0
Lodi Usd-Turner Academy at Tokay Colony
 120 0 0
Home Church, the
 116 0 0
Fresh Innovations LLC
 111 0 0
Btqc-Escalon
 110 0 0
San Joaquin Fair 2nd District
 110 1 0
Schulte Road Warehouse 3, LLC Wtr Sys
 110 0 0
Plug Connection Lodi
 102 1 1
Berea Baptist Church Stockton CA
 100 0 0
Church of Jesus Christ of Lds
 100 0 0
Countryside Liquors & Gas
 100 0 0
Darrigos Water System
 100 0 0
Escalon Livestock Mkt
 100 0 0
Escalon Usd Collegeville Sch
 100 0 0
Holiday Harbor Marina
 100 0 0
J M Eagle (ws)
 100 1 0
Linden Usd-Glenwood School
 100 0 0
McManis Family Vineyards Inc.
 100 0 0
Morada Produce
 100 0 0
Oakmoore Congre of Jehovah Wit
 100 0 0
Oasis Marina-Resort
 100 0 0
Ranch Coffee Shop
 100 1 0
Sjc Sports Complex
 100 0 0
Turner Cut Resort
 100 0 0
West Kingdom Hall of Jehovah's Witnesses
 100 1 0
Jahant Woods Cellars
 90 0 0
Basalite Tracy
 86 0 0
Cozad Water System
 85 0 0
SJ County-Redwood School
 83 0 0
Northwest Pipe Company
 82 2 1
Turner Road Vintners (east)
 80 1 0
Marions Ranch House Motel
 78 0 0
EL Rancho Motel
 76 1 0
Manteca Industrial Prk Csa-30
 76 0 0
Stockton Baptist Church
 76 0 0
Korean Presbyterian Church
 70 0 0
Oak Ridge Winery, LLC
 70 1 0
Bethany Temple Water System
 65 0 0
All 213 in the systems table
Inactive systems (268, 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.