National Semiconductor Corp.
NPL SiteSanta Clara, CA
According to the EPA Superfund Enterprise Management System, National Semiconductor Corp. in Santa Clara, CA is listed with NPL status NPL Site. Its Hazard Ranking System (HRS) score is 35.57. The public extract catalogs 41 contaminant records for this site. EPA marks construction of the cleanup remedy as complete. NPL listing is a cleanup-authority designation, not a measured health-risk score.
Superfund National Priorities List inclusion (status and HRS score shown above) is the EPA's formal designation that a contaminated site qualifies for long-term federal cleanup authority under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). A federal-facility classification means the site is owned or operated by a federal agency, which routes cleanup responsibility differently than a privately owned site.
"Construction Complete" (status shown above) is an EPA milestone marking that the physical remedy work is finished, not that the site has exited EPA oversight; long-term monitoring can continue afterward. Deletion from the NPL is a separate, later step the EPA takes only once it determines every planned response action is finished.
NPL listing is a cleanup-authority designation in the EPA record, not a quantitative health-risk score. HRS scores of 28.50 or above qualify a site for the NPL under the EPA screening model (toxicity, pathways, waste quantity, and affected population factors). For current site conditions and official community notices, see the EPA Regional Superfund profile and the California environmental agency.
What is the cleanup status of this Superfund site?
Contaminants
| Contaminant | Media |
|---|---|
| 1,1,1-TRICHLOROETHANE | Groundwater |
| 1,1,1-TRICHLOROETHANE | Soil |
| 1,1,2-TRICHLORO-1,2,2-TRIFLUOROETHANE | Groundwater |
| 1,1,2-TRICHLORO-1,2,2-TRIFLUOROETHANE | Soil |
| 1,1-DICHLOROETHANE | Soil |
| 1,1-DICHLOROETHENE | Groundwater |
| 1,1-DICHLOROETHENE | Soil |
| 1,2-DICHLOROBENZENE | Soil |
| 1,2-DICHLOROETHANE | Groundwater |
| 1,2-DICHLOROETHENE (CIS AND TRANS MIXTURE) | Groundwater |
| 1,2-DICHLOROETHENE (CIS AND TRANS MIXTURE) | Soil |
| 1,4-DICHLOROBENZENE | Groundwater |
| 2,4-DIMETHYLPHENOL | Groundwater |
| 2,4-DINITROPHENOL | Groundwater |
| 4-CHLORO-3-METHYLPHENOL | Groundwater |
| ACETONE | Soil |
| BENZENE | Groundwater |
| BENZENE | Soil |
| CHLOROBENZENE | Groundwater |
| CHLOROETHENE (VINYL CHLORIDE) | Groundwater |
| CHLOROFORM | Groundwater |
| CHLOROMETHANE | Groundwater |
| CIS-1,2-DICHLOROETHENE | Groundwater |
| CIS-1,2-DICHLOROETHENE | Soil |
| ETHYLBENZENE | Groundwater |
| ETHYLBENZENE | Soil |
| PENTACHLOROPHENOL | Groundwater |
| PENTACHLOROPHENOL | Soil |
| PHENOL | Groundwater |
| PHENOL | Soil |
| TETRACHLOROETHENE | Groundwater |
| TETRACHLOROETHENE | Soil |
| TOLUENE | Groundwater |
| TOLUENE | Soil |
| TRANS-1,2-DICHLOROETHENE | Groundwater |
| TRICHLOROETHANE (MIXED ISOMERS) | Groundwater |
| TRICHLOROETHANE (MIXED ISOMERS) | Soil |
| TRICHLOROETHENE | Groundwater |
| TRICHLOROETHENE | Soil |
| XYLENE (MIXED ISOMERS) | Groundwater |
| XYLENE (MIXED ISOMERS) | Soil |
Location
Other Superfund Sites in California
| Site Name | Status | HRS Score |
|---|---|---|
| Advanced Micro Devices, Inc. | NPL Site | 37.93 |
| Advanced Micro Devices, Inc. (Building 915) | NPL Site | 31.94 |
| Aerojet General Corp. | NPL Site | 54.63 |
| Afterthought Mine | NPL Site | 50.00 |
| Alameda Naval Air Station | NPL Site | 50.00 |
| Alark Hard Chrome | NPL Site | 50.50 |
| AMCO Chemical | NPL Site | 50.00 |
| Applied Materials | NPL Site | 31.94 |
| Argonaut Mine | NPL Site | 58.31 |
| Atlas Asbestos Mine | NPL Site | 45.55 |
How does this site's HRS score compare in California?
Of the 116 California Superfund sites with a scored Hazard Ranking System (HRS) evaluation, National Semiconductor Corp. ranks #69 by score (35.57).
Either side of it: Fresno Municipal Sanitary Landfill (35.57), Monolithic Memories (35.57), Newmark Ground Water Contamination (35.57), San Fernando Valley (Area 4) (35.57)
Frequently Asked Questions
What is the National Semiconductor Corp. Superfund site? ▼
What does NPL listing mean for National Semiconductor Corp.? ▼
What is the HRS score for National Semiconductor Corp.? ▼
What contaminants are at the National Semiconductor Corp. site? ▼
What is the cleanup status of National Semiconductor Corp.? ▼
NPL listing is a cleanup-authority designation in the EPA record, not a quantitative health-risk score. See Superfund Sites Explained for how the National Priorities List, Hazard Ranking System, and cleanup phases work.
Read our methodology - how this data is sourced, computed, and verified.