Santa Clara County, CA
The federal environmental record for Santa Clara County (population 1,877,592): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
23
Superfund NPL sites
47
federal cleanup sites
5
PFAS-detecting water systems
40
TRI facilities
67
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Advanced Micro Devices, Inc. | Sunnyvale | on the NPL | 06/10/1986 |
| Advanced Micro Devices, Inc. (Building 915) | Sunnyvale | on the NPL | 08/30/1990 |
| Applied Materials | Santa Clara | on the NPL | 07/22/1987 |
| CTS Printex, Inc. | Mountain View | on the NPL | 02/21/1990 |
| Fairchild Semiconductor Corp. (Mountain View Plant) | Mountain View | on the NPL | 02/11/1991 |
| Fairchild Semiconductor Corp. (South San Jose Plant) | South San Jose | on the NPL | 10/04/1989 |
| Hewlett-Packard (620-640 Page Mill Road) | Palo Alto | on the NPL | 02/21/1990 |
| Intel Corp. (Mountain View Plant) | Mountain View | on the NPL | 06/10/1986 |
| Intel Corp. (Santa Clara III) | Santa Clara | deleted | 06/10/1986 |
| Intel Magnetics | Santa Clara | on the NPL | 06/10/1986 |
| Intersil Inc./Siemens Components | Cupertino | on the NPL | 08/30/1990 |
| JASCO Chemical Corp. | Mountain View | deleted | 10/04/1989 |
| Lorentz Barrel & Drum Co. | San Jose | on the NPL | 10/04/1989 |
| Moffett Naval Air Station | Sunnyvale | on the NPL | 07/22/1987 |
| Monolithic Memories | Sunnyvale | on the NPL | 07/22/1987 |
| National Semiconductor Corp. | Santa Clara | on the NPL | 07/22/1987 |
| Raytheon Corp. | Mountain View | on the NPL | 06/10/1986 |
| South Bay Asbestos Area | Alviso | on the NPL | 06/10/1986 |
| Spectra-Physics, Inc. | Mountain View | on the NPL | 02/11/1991 |
| Synertek, Inc. (Building 1) | Santa Clara | on the NPL | 10/04/1989 |
| Teledyne Semiconductor | Mountain View | on the NPL | 07/22/1987 |
| TRW Microwave, Inc. (Building 825) | Sunnyvale | on the NPL | 02/21/1990 |
| Westinghouse Electric Corp. (Sunnyvale Plant) | Sunnyvale | on the NPL | 06/10/1986 |
Drinking water: PFAS testing
Public water systems serving Santa Clara 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 |
|---|---|---|
| CITY OF GILROY CA4310004 | PFBS: 9.4 ng/L PFOA: 8 ng/L PFPeA: 7.8 ng/L | above final limit |
| SAN JOSE WATER CA4310011 | PFOS: 6.2 ng/L PFHxS: 5.5 ng/L | above final limit |
| GREAT OAKS WC INC CA4310022 | PFHxS: 8 ng/L PFPeA: 4.7 ng/L PFOS: 4.6 ng/L | above final limit |
| CWSC LOS ALTOS SUBURBAN CA4310001 | PFHxS: 3.5 ng/L | detected |
| CITY OF MORGAN HILL CA4310006 | PFPeA: 3.5 ng/L PFHxA: 3.4 ng/L PFHxS: 3.3 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
40 facilities in Santa Clara filed TRI reports for 2024, totalling 486k lb released. The 25 largest by volume:
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| CLEAN HARBORS SAN JOSE LLC | SAN JOSE | Lead And Lead Compounds, Nitric acid | 359k lb |
| GORILLA CIRCUITS | SAN JOSE | Copper | 73k lb |
| SIERRA CIRCUITS INC (DBA SIERRA PROTO EXPRESS) | SUNNYVALE | Copper And Copper Compounds, Nitric acid | 21k lb |
| QUALITEK INC (DBA WESTAK) | SUNNYVALE | Ammonia, Copper And Copper Compounds | 13k lb |
| HEADWAY TECHNOLOGIES INC. | MILPITAS | N-Methyl-2-pyrrolidone | 4k lb |
| AGILENT TECHNOLOGIES INC | SANTA CLARA | Acetonitrile, Toluene | 4k lb |
| TTM TECHNOLOGIES | SAN JOSE | Nitric acid, Copper compounds | 3k lb |
| EQUILON SAN JOSE TERMINAL | SAN JOSE | Xylene (mixed isomers), Toluene | 2k lb |
| CSL OPERATING LLC | SANTA CLARA | Nitric acid | 2k lb |
| INFINERA CORP | SUNNYVALE | N-Methyl-2-pyrrolidone | 1k lb |
| NORTHROP GRUMMAN SYSTEMS CORP | SUNNYVALE | Ammonia, Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region) | 1k lb |
| STREAMLINE CIRCUITS | SANTA CLARA | Formaldehyde, Nitric acid | 530 lb |
| BABBITT BEARING CO INC | SAN JOSE | Lead compounds | 312 lb |
| TTM TECHNOLOGIES N.A. LLC | SANTA CLARA | Lead And Lead Compounds | 305 lb |
| CIREXX INTERNATIONAL | SANTA CLARA | Copper | 250 lb |
| WESTERN DIGITAL TECHNOLOGIES INC | SAN JOSE | N-Methyl-2-pyrrolidone | 221 lb |
| APCT INC | SANTA CLARA | Copper And Copper Compounds | 198 lb |
| SANMINA-PLANT # 1 | SAN JOSE | Copper And Copper Compounds | 129 lb |
| BURKE INDUSTRIES INC | SAN JOSE | Lead And Lead Compounds, Zinc compounds | 93 lb |
| HILL BROTHERS CHEMICAL CO | SAN JOSE | Ammonia | 80 lb |
| QUANTUMSCAPE - BUILDING 2 | SAN JOSE | Lithium bis[(trifluoromethyl)sulfonyl] azanide | 75 lb |
| OLDCASTLE PRECAST INC | MORGAN HILL | Lead compounds, Mercury compounds | 52 lb |
| SANMINA - BLDG # 4 | SAN JOSE | Lead compounds | 20 lb |
| SANMINA PLANT # 2 | SAN JOSE | Copper And Copper Compounds, Lead And Lead Compounds | 17 lb |
| SANMINA - BLDG 3 | SAN JOSE | Lead compounds | 14 lb |
Underground fuel tanks
EPA's UST Finder records 614 tank facilities in Santa Clara: 1,627 tanks in service and 0 closed. 2,635 fuel releases are on record, of which 67 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Santa Clara as Zone 2, moderate predicted indoor radon (2 to 4 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 Santa Clara, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- ADVANCED MICRO DEVICES INCSUNNYVALE
- ADVANCED MICRO DEVICES, INC.SUNNYVALE
- ADVANCED MICRO DEVICES, INC. (BUILDING 915)SUNNYVALE
- ALMADEN QUICKSILVER PARKSAN JOSE
- APPLIED MATERIALS INCORPORATEDSANTA CLARA
- AUTEK SYSTEMS CORPSAN JOSE
- B2 PERFECTION AUTOBODYSUNNYVALE
- CONTINENTAL CAN CO USA PLT 12SAN JOSE
- CRYSTAL SOLAR INC.SANTA CLARA
- CUPERTINO FIRE STATION MERCURY SPILL ERCUPERTINO
- FAIRCHILD SEMICONDUCTOR CORP. (SOUTH SAN JOSE PLANT)SAN JOSE
- FREMONT LAUNDRYMOUNTAIN VIEW
- FWS-DON EDWARDS SAN FRANCISCO BAY NATIONALALVISO
- HEWLETT-PACKARD (620-640 PAGE MILL ROAD)PALO ALTO
- HP INCPALO ALTO
- IBM CORPSAN JOSE
- ICORE INTERNATIONAL (FORMER)SUNNYVALE
- INTEL CORPORATIONMOUNTAIN VIEW
- INTEL CORPORATION - SC3 FACILITYSANTA CLARA
- INTEL MAGNETICSSANTA CLARA
- INTERSIL INC./SIEMENS COMPONENTSCUPERTINO
- JASCO CHEMICAL CORPMOUNTAIN VIEW
- JENNINGS TECHNOLOGY CO, LLCSAN JOSE
- LORENTZ BARREL & DRUM CO.SAN JOSE
- MAGNETICS PERIPHERALS INCSANTA CLARA
- MOFFETT FIELD NAVAL AIR STATIONMOFFETT FIELD
- NATIONAL SEMICONDUCTOR CORPSANTA CLARA
- NAVAL INDUSTRIAL RESERVE ORDINANCE PLANTSUNNYVALE
- NECMOUNTAIN VIEW
- NORTHROP GRUMMAN MARINE SYSTEMSSUNNYVALE
- ONIZUKA AIR FORCE BASESUNNYVALE
- PHILIPS SEMICONDUCTORSSUNNYVALE
- RAYTHEON GROUNDWATER TREATMENT SYSTEMMOUNTAIN VIEW
- SMI HOLDING LLCCUPERTINO
- SOUTH BAY ASBESTOS AREAALVISO
- SPECTRA-PHYSICS, INC.MOUNTAIN VIEW
- SYLVANIA SYSTEMS GROUP GTE PRODUCTSMOUNTAIN VIEW
- TELEDYNE SEMICONDUCTORMOUNTAIN VIEW
- TRIPLE SITESUNNYVALE
- TRW MICROWAVE INC (BLDG 825)SUNNYVALE
- UNISYSSANTA CLARA
- UNITED STATES POSTAL SERVICECAMPBELL
- UNIVAR USA INCSAN JOSE
- USNAVY MOFFETT FIELD NAVAL AIR STATIONMOFFETT FIELD
- VA PALO ALTO HEALTH CARE SYSTEMPALO ALTO
- WESTERN PRECISION INCSUNNYVALE
- ZEP MFG COSANTA CLARA