Is It Safe to Grow Food in Contra Costa County?
Federal record: HighWe checked the federal record around Contra Costa County — 5,855 documented sites across 7 of the 8 site registers 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.
Documented sites nearest the Contra Costa County center
- Summit Of Zion — Mining · ~0.5 km from the county center
- Summit Of Zion Mine — Mining · ~0.6 km from the county center
- Silver Mine — Mining · ~0.6 km from the county center
These are the closest documented sites to Contra Costa County's geographic center — a screening reference, not a reading on any specific address. Check your own California parcel to see what's actually near you.
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See exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
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