Stanislaus County, CA
The federal environmental record for Stanislaus County (population 551,430): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
3
Superfund NPL sites
14
federal cleanup sites
2
PFAS-detecting water systems
24
TRI facilities
12
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Modesto Ground Water Contamination | Modesto | on the NPL | 03/31/1989 |
| Riverbank Army Ammunition Plant | Riverbank | on the NPL | 02/21/1990 |
| Valley Wood Preserving, Inc. | Turlock | on the NPL | 03/31/1989 |
Drinking water: PFAS testing
Public water systems serving Stanislaus 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 |
|---|---|---|
| MODESTO, CITY OF CA5010010 | PFOS: 26 ng/L PFHxS: 9.3 ng/L PFOA: 8.6 ng/L | above final limit |
| CERES, CITY OF CA5010028 | PFOS: 24 ng/L PFOA: 12 ng/L PFPeA: 8.4 ng/L | above final limit |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
24 facilities in Stanislaus filed TRI reports for 2024, totalling 248k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| BLUE DIAMOND GROWERS | MODESTO | Sulfuryl fluoride | 46k lb |
| CALIFORNIA DAIRIES INC TURLOCK | TURLOCK | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 45k lb |
| DARLING INGREDIENTS INC | CROWS LANDING | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 35k lb |
| SAPUTO CHEESE USA INC | NEWMAN | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 31k lb |
| CALIFORNIA DAIRIES INC TURLOCK NORTH | TURLOCK | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 25k lb |
| SILGAN CONTAINER MANUFACTURING CORP. | RIVERBANK | Xylene (mixed isomers), Certain glycol ethers | 16k lb |
| CRYSTAL CREAMERY INC. | MODESTO | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Peracetic acid | 14k lb |
| DAIRY FARMERS OF AMERICA INC | TURLOCK | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 12k lb |
| CONAGRA FOODS PACKAGED FOODS LLC. | OAKDALE | Ammonia | 11k lb |
| FRITO LAY INC. | MODESTO | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Polycyclic aromatic compounds | 3k lb |
| CENTRAL VALLEY CHEESE | TURLOCK | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 3k lb |
| THUNDERBOLT WOOD TREATING | RIVERBANK | Ammonia, Chromium | 2k lb |
| SONOCO METAL PACKAGING LLC | OAKDALE | Xylene (mixed isomers) | 2k lb |
| CUSTOM MARBLE & ONYX | MODESTO | Styrene | 2k lb |
| FOSTER TURKEY PRODUCTS FTP-1 | TURLOCK | Peracetic acid | 743 lb |
| ENVIRO TECH CHEMICAL SERVICES INC. | MODESTO | Peracetic acid | 500 lb |
| GALLO GLASS CO | MODESTO | Chromium compounds (except for chromite ore mined in the Transvaal Region), Copper | 167 lb |
| PACIFIC STAR CHEMICAL LLC D.B.A. NORTHSTAR CHEMICAL | MODESTO | Nitric acid | 16 lb |
| A.L. GILBERT CO | OAKDALE | - | 0 lb |
| NESTLE USA INC | MODESTO | - | 0 lb |
| SOUTHERN COUNTIES OIL CO. LP D.B.A. SC FUELS | MODESTO | - | 0 lb |
| 7/11 MATERIALS INC | MODESTO | Lead, Mercury | 0 lb |
| PURINA ANIMAL NUTRITION LLC - TURLOCK | TURLOCK | - | 0 lb |
| WEST MAIN TURLOCK FEEDMILL & COMMODITIES | TURLOCK | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 208 tank facilities in Stanislaus: 622 tanks in service and 0 closed. 465 fuel releases are on record, of which 12 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Stanislaus 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 Stanislaus, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- BONZI SANITARY LANDFILLMODESTO
- ELWOOD'S DRY CLEANING SERVICESMODESTO
- FREELOVE VALLEY HOME METH LABVALLEY HOME
- GALLO GLASS COMPANYMODESTO
- GEER ROAD LANDFILL - STANISLAUS COUNTYMODESTO
- INDALEX WEST INC.MODESTO
- MODESTO DISPOSAL SERVICEMODESTO
- MODESTO GROUND WATER CONTAMINATIONMODESTO
- NAVAL AIR LOGISTICS FORCECROWS LANDING
- PACIFIC ALUMINUM CORPMODESTO
- RIVERBANK ARMY AMMUNITION PLT.RIVERBANK
- THUNDERBOLT WOOD TREATINGRIVERBANK
- VALLEY WOOD PRESERVING, INC.TURLOCK
- WESTLEY TIRE FIREWESTLEY