San Joaquin County, CA
The federal environmental record for San Joaquin County (population 800,965): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
3
Superfund NPL sites
6
federal cleanup sites
7
PFAS-detecting water systems
34
TRI facilities
73
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| McCormick & Baxter Creosoting Co. | Stockton | on the NPL | 10/14/1992 |
| Sharpe Army Depot | Lathrop | on the NPL | 07/22/1987 |
| Tracy Defense Depot (USARMY) | Tracy | on the NPL | 08/30/1990 |
Drinking water: PFAS testing
Public water systems serving San Joaquin with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| CALIFORNIA WATER SERVICE - STOCKTON CA3910001 | PFOS: 5.2 ng/L | above final limit |
| LODI, CITY OF CA3910004 | PFBS: 17 ng/L PFOA: 6.2 ng/L PFHxS: 6.1 ng/L | above final limit |
| MANTECA, CITY OF CA3910005 | PFHxS: 19 ng/L PFHxA: 9.5 ng/L PFOA: 7 ng/L | above final limit |
| RIPON, CITY OF CA3910007 | PFOS: 12 ng/L PFOA: 5.2 ng/L PFHxS: 3.5 ng/L | above final limit |
| CITY OF STOCKTON CA3910012 | PFOS: 28 ng/L PFOA: 6.7 ng/L PFBS: 6.2 ng/L | above final limit |
| CITY OF LATHROP CA3910015 | PFOS: 17 ng/L PFBS: 5 ng/L PFHxS: 3.5 ng/L | above final limit |
| SAN JOAQUIN COUNTY-MOKELUMNE ACRES CA3910017 | PFOS: 13.5 ng/L PFBS: 8.5 ng/L PFOA: 8.3 ng/L | above final limit |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
34 facilities in San Joaquin filed TRI reports for 2024, totalling 89k lb released. The 25 largest by volume:
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| TESLA INC | LATHROP | 4,4'-Isopropylidenediphenol, Triglycidyl isocyanurate | 31k lb |
| J R SIMPLOT CO LATHROP | LATHROP | Diisocyanates, Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 26k lb |
| CALIFORNIA NATURAL PRODUCTS | LATHROP | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Nitric acid | 15k lb |
| OWENS-BROCKWAY GLASS CONTAINER INC PLANT #22 | TRACY | Ammonia, Lead And Lead Compounds | 6k lb |
| WESTLAKE ROYAL ROOFING - LATHROP | LATHROP | Chromium compounds (except for chromite ore mined in the Transvaal Region), Lead | 4k lb |
| SCHUFF STEEL CO | STOCKTON | Manganese, Chromium | 2k lb |
| FRANZIA WINERY | RIPON | Ammonia | 2k lb |
| TESORO - STOCKTON TERMINAL | STOCKTON | Toluene, Xylene (mixed isomers) | 1k lb |
| US DOE LLNL EXPERIMENTAL TEST SITE (SITE 300) | TRACY | Lead | 1k lb |
| LEPRINO FOODS CO | TRACY | Nitric acid | 255 lb |
| HOGAN MANUFACTURING INC | ESCALON | Chromium, Nickel | 207 lb |
| GAF MATERIALS MFG LLC | STOCKTON | Polycyclic aromatic compounds, Benzo[g,h,i]perylene | 98 lb |
| OLDCASTLE PRECAST INC | STOCKTON | Lead compounds, Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 96 lb |
| CONCRETE INC | STOCKTON | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 83 lb |
| VALIMET INC | STOCKTON | Aluminum (fume or dust) | 71 lb |
| WESTLAKE ROYAL ROOFING - FRENCH CAMP | FRENCH CAMP | Lead | 31 lb |
| STOCKTON STEEL | STOCKTON | Manganese, Nickel | 29 lb |
| HOGAN MANUFACTURING INC LIFT-U DIV | ESCALON | Chromium, Nickel | 16 lb |
| HJ BAKER & BRO LLC | STOCKTON | Hydrogen sulfide | 11 lb |
| WOODBRIDGE WINERY | ACAMPO | Ammonia | 5 lb |
| CBC STEEL BUILDINGS | LATHROP | Lead | 3 lb |
| KENT'S OIL SERVICE INC. | STOCKTON | Polycyclic aromatic compounds | 3 lb |
| LEGGETT & PLATT URETHANE DIV BRANCH 6014 | TRACY | Diisocyanates | 2 lb |
| CHEMSTATION OF NORTHERN CALIFORNIA | STOCKTON | - | 0 lb |
| JENSEN PRECAST | LOCKEFORD | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 266 tank facilities in San Joaquin: 731 tanks in service and 0 closed. 913 fuel releases are on record, of which 73 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps San Joaquin as Zone 3, the lowest predicted indoor radon (under 2 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for San Joaquin, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- COLBERG BOAT WORKSSTOCKTON
- LAWRENCE LIVERMORE NATL LAB (SITE 300) (USDOE)TRACY
- MCCORMICK & BAXTER CREOSOTING CO.STOCKTON
- NESTLE FOODS CORPRIPON
- SHARPE ARMY DEPOTLATHROP
- TRACY TIRE FIRETRACY