How far each database search reaches

ASTM E1527-21 sets an approximate minimum search distance for each standard government record source, measured from the nearest boundary of the subject property. This page states those reaches as facts about the standard, grouped the way a radius report is actually read. The environmental professional may shorten a mileage reach per 8.1.2.1, justifying each reduction in the report; the two federal reaches marked "fixed" below may never be shortened, and searches limited to the property itself may not be narrowed either.

Reaches a full mile

What is searched	Reach
Federal Superfund sites (NPL)	1.0 mile, fixed
State or tribal cleanup sites (the state Superfund analog)	1.0 mile
Hazardous waste facilities in RCRA corrective action (CORRACTS)	1.0 mile

Reaches half a mile

What is searched	Reach
Sites removed from the NPL	0.5 mile
CERCLA sites under removals or orders (SEMS)	0.5 mile
CERCLA sites archived with no further federal action (NFRAP)	0.5 mile
RCRA treatment, storage, and disposal facilities	0.5 mile, fixed
State or tribal hazardous waste facilities	0.5 mile
Landfills and solid waste facilities	0.5 mile
Leaking storage tank cases (LUST)	0.5 mile
Voluntary cleanup program sites	0.5 mile
Brownfield sites	0.5 mile

Only the property and its neighbors

What is searched	Reach
RCRA hazardous waste generators	Property and adjoining properties
Registered storage tanks (UST)	Property and adjoining properties
Spill and release reports (ERNS)	Property only
Federal institutional and engineering control registries	Property only
State or tribal control registries	Property only

Two footnotes in the standard matter here. Five of these searches reach back in time: closed CERCLA removal sites, former RCRA TSD facilities, delisted state cleanup sites, closed tank cases, and completed voluntary cleanups all still count (Note A). And an NFRAP archive entry is a statement about federal Superfund priorities only. It does not mean the site is clean, and it does not speak for state agencies (Note B).