6 Phase I ESA Red Flags on Industrial Land

A Phase I Environmental Site Assessment on industrial land typically turns up six historical red flags: a former gas station or fuel-dispensing use, a former dry cleaner, undocumented underground storage tanks, prior heavy manufacturing, contamination migrating from a neighboring parcel, and hits in federal or state regulatory databases tied to the site or its surroundings.

What Does a Phase I ESA Actually Investigate?

A Phase I ESA is a records-and-history review, not a soil test: it reconstructs everything a property has been used for since roughly 1940 and checks that history against federal, state, and local contamination records, according to the EPA. The process exists because of the All Appropriate Inquiries (AAI) rule, mandated by the 2002 Brownfields Amendments to CERCLA and effective since November 1, 2006, which requires this kind of investigation before a buyer can claim certain federal liability defenses.

Completing an ESA that satisfies AAI is what preserves the innocent landowner, bona fide prospective purchaser, and contiguous property owner defenses under CERCLA, meaning a buyer who didn’t cause contamination and did appropriate diligence beforehand isn’t automatically on the hook for cleanup costs tied to a prior owner’s activity, per the EPA. Since February 2023, the EPA has recognized the ASTM E1527-21 standard as satisfying AAI, and it’s now the version environmental professionals use nationwide.

1. Was the Property Ever a Gas Station or Fuel-Dispensing Site?

A documented history of motor-fuel dispensing is one of the most consistent triggers for a Recognized Environmental Condition, because pump islands, product lines, and the tanks that fed them are a common source of petroleum releases into soil and groundwater. State brownfields programs treat former gas stations and petroleum bulk plants as a standard category of contaminated property alongside vacant industrial facilities, according to the Iowa Department of Natural Resources.

The environmental professional confirms this history through historical aerial photographs, fire insurance maps, and city directories going back decades, not just a visual inspection of the lot today, since a converted gas station can look like an ordinary paved parcel once the canopy and pumps are gone. If the historical record shows fuel dispensing and the tank closure paperwork doesn’t check out, expect the report to flag it as a REC regardless of how the surface looks now.

2. Did a Dry Cleaner Ever Operate on the Site?

A former dry cleaner is treated as a high-risk historical use because the solvents involved, chiefly perchloroethylene, sink through soil and spread through groundwater in ways that are expensive and slow to trace and remediate. This matters on industrial land specifically because dry-cleaning plants, laundry services, and textile finishing operations were common tenants in older industrial and light-commercial buildings, and that use can be easy to miss if a parcel has since been repurposed.

The environmental professional looks for this history in the same historical sources used for fuel-dispensing uses, according to Holland & Knight. If a prior tenant on the parcel or an immediately adjoining lot was a dry cleaner and there’s no documentation that the site was ever tested or closed out, expect that history alone to generate a REC even before any sampling happens.

3. Are There Underground Storage Tanks That Were Never Properly Closed?

Underground storage tanks are one of the single largest sources of confirmed contamination nationally: 573,296 UST releases had been confirmed and 515,859 cleanups completed as of September 2023, leaving 57,437 sites still not resolved, according to EPA’s Office of Underground Storage Tanks. Industrial parcels are disproportionately likely to have tanks in their history, whether for fuel, solvents, or process chemicals, and a tank that was simply abandoned in place rather than formally closed leaves an open question a Phase I ESA is specifically designed to catch.

A closed tank with documentation, removal or fill-in-place records, closure certification from the state agency, and any confirmed-clean soil sampling, is a very different finding than a tank the historical record shows but no closure paperwork exists for. States report that UST releases are the most common source of groundwater contamination nationally, and petroleum is the most common contaminant, per EPA. If your due diligence period on an industrial parcel turns up a tank with no closure record, treat that as unresolved until an environmental professional says otherwise; see due diligence period for how that window typically works in a purchase contract.

4. Did Prior Heavy Manufacturing or Industrial Processing Take Place Here?

Prior manufacturing, chemical processing, or bulk storage use is exactly the category of history a Phase I ESA is built to uncover, because these operations routinely handled solvents, fuels, and process chemicals under storage and disposal practices that predate today’s environmental regulations. State brownfields programs list fertilizer warehouses and vacant industrial facilities alongside gas stations as classic examples of sites where contamination concerns, real or only suspected, have stalled resale and redevelopment, according to the Iowa Department of Natural Resources.

To document this kind of use, the ASTM E1527-21 standard requires review of four minimum historical sources for the subject property: aerial photographs, fire insurance maps, city directories, and topographic maps, per Holland & Knight. A parcel that shows up as a foundry, plating shop, chemical warehouse, or processing plant in decades-old directories carries that history forward even after the building is gone or the use has changed, and a Phase I ESA is what surfaces it before a buyer commits.

5. Could Contamination Be Migrating From a Neighboring Property?

A parcel with a completely clean use history can still carry a Recognized Environmental Condition if a contaminant plume from a neighboring property has moved onto it or is likely to, which is why the ASTM standard requires researching adjoining land, not just the subject parcel. Under the current standard, “adjoining properties” isn’t limited to lots that share a boundary line; it also includes properties across a street or alley from the subject site, according to The National Law Review.

This is a distinct risk category from anything happening on the property itself, and it’s a common reason industrial land near older commercial corridors gets flagged even when its own use history looks clean. The environmental professional applies the same historical-source review to those adjoining properties and checks whether groundwater flow direction and known contamination on a neighboring parcel put the subject site in the likely path of a release. A REC generated this way still counts against the property, and it’s usually the hardest kind for a buyer to resolve, since remediation depends on a party who doesn’t own the land in question.

6. Do Regulatory Database Searches Turn Up Hits Tied to the Property or Its Surroundings?

A Phase I ESA includes a mandatory search of federal, state, tribal, and local government environmental records, and a listing that comes back tied to the subject property or a nearby address is treated as significant even before any physical inspection happens, per the EPA. These searches cover contamination cleanup lists, leaking tank registries, hazardous waste handler records, and Superfund-related databases, and a hit doesn’t have to be on the subject parcel itself to matter; a listing on an adjoining or nearby property within the standard’s required search radius still gets documented and evaluated.

Some states go further and make a completed Phase I ESA a precondition for anything else. A community pursuing brownfields cleanup funding in Iowa, for example, must complete a Phase I ESA using the ASTM E1527-21 standard before it can even acquire an eligible property, with narrow exceptions for parcels obtained through tax foreclosure, court order, or eminent domain, according to the Iowa Department of Natural Resources. If a database hit turns up on your target parcel or its immediate surroundings, expect that finding to shape financing, price negotiation, and timeline regardless of what the property looks like on a site visit; see our guide to land types for how industrial and commercial parcels differ from other categories in this respect.

A Phase I ESA that comes back clean on all six of these points is a genuinely different asset than one that comes back with an open REC, and the difference shows up in financing, insurance, and resale long after closing. If a REC does surface, the standard path is a Phase II assessment, actual soil, groundwater, or soil-gas sampling, to confirm what’s there and how far it reaches; a city’s brownfields office can walk through what that process looks like locally, as Portland’s Bureau of Environmental Services does for property owners weighing a Phase II against redevelopment plans. For a related category of due-diligence risk that shows up separately from environmental history, see our guide to red flags that mean vacant land isn’t actually buildable.

If you own industrial or commercial land carrying one of these red flags and would rather not manage a Phase II assessment, remediation, or a long due-diligence process before you can sell, AMM Land Sales makes cash offers directly to owners in all 50 states and closes through a licensed title company; see sell industrial land or sell commercial land for what that process looks like.