Should be, but then there was a lot of lead paint. When I lived in Brooklyn, I dug up the yard for a garden and found lots of coal [[WTF?). And I think builders used to bury lots of waste in the yard. Don't forget: Before broad-brush zoning, a neighborhood might have a tannery or a paint factory in it.
That's why professionals look through old fire insurance maps, test soil, check paint chips, etc. These days, you'll pay a firm a pretty penny just to evaluate a parcel and suggest what, if any, remediation is needed.
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