California Contamination Data

We checked the federal record around Orange County — 21,370 documented sites across 8 of the 9 source types we track, 98 of them high-severity.

The most significant on record: 51 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Orange County carries one of the heavier federal records we track — 21,370 documented sites, most of them brownfields. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.

We checked the federal record around Alameda County — 11,350 documented sites across 7 of the 9 source types we track, 57 of them high-severity.

The most significant on record: 48 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Alameda County carries one of the heavier federal records we track — 11,350 documented sites, most of them brownfields. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.

We checked the federal record around Los Angeles County — 57,418 documented sites across 7 of the 9 source types we track, 422 of them high-severity.

The most significant on record: 305 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Los Angeles County carries one of the heavier federal records we track — 57,418 documented sites, most of them brownfields. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.

We checked the federal record around San Mateo County — 5,427 documented sites across 7 of the 9 source types we track, 30 of them high-severity.

The most significant on record: 16 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

San Mateo County carries one of the heavier federal records we track — 5,427 documented sites, most of them brownfields. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.

We checked the federal record around Santa Clara County — 12,058 documented sites across 7 of the 9 source types we track, 142 of them high-severity.

The most significant on record: 62 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Santa Clara County carries one of the heavier federal records we track — 12,058 documented sites, most of them brownfields. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.

We checked the federal record around Contra Costa County — 5,855 documented sites across 7 of the 9 source types we track, 55 of them high-severity.

The most significant on record: 23 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Contra Costa County carries one of the heavier federal records we track — 5,855 documented sites, most of them brownfields. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.