The Dirt Under the Deal

17 Environmental Questions to Ask Before Buying Commercial Land

Commercial land can look simple from the road. A few acres, decent access, room to build, a price that seems workable, and maybe a broker saying the parcel has plenty of potential. Then the deeper questions start. What was here before? Did anyone store fuel on the property? Where does stormwater go? Is the groundwater shallow? Did the neighbor run a dry cleaner, machine shop, maintenance yard, or gas station for thirty years?

Those questions matter because commercial land comes with history. Sometimes that history is clean and boring, which is exactly what a buyer wants. Other times, the property comes with old tanks, buried debris, contaminated soil, shallow groundwater, vapor concerns, drainage problems, or missing records that nobody wants to talk about until the deal is already moving.

This is where an environmental engineer can help. An environmental engineer looks at the property, its past uses, surrounding properties, available records, visible site conditions, and the buyer’s future plans. The goal is to help a buyer, lender, broker, developer, municipality, or business owner understand the environmental risk before closing. That does not mean every site is a disaster waiting to happen. It means the buyer should know what kind of land they are buying before the land becomes their problem.

Before you fall in love with the price per acre, ask what might be hiding under the gravel.

1. What Was the Property Used for Before Now

The first question is simple. What happened here before the current owner put up the sign, swept the building, and called it a development opportunity?

A property that looks like a storage lot today may have been any of the following in a previous life:

• Auto repair shop or service station

• Dry cleaner or laundry facility

• Manufacturing site or machine shop

• Agricultural supply yard or farm chemical storage area

• Rail-related property or maintenance yard

• Warehouse, landfill edge, or industrial facility

Even vacant land can have a past. It may have been filled, graded, used for dumping, carved out of a larger industrial parcel, or crossed by old drainage routes.

An environmental engineer starts by piecing together that history. Old aerial photos, city directories, fire insurance maps, permit records, interviews, regulatory files, and historical land use records can all help. The point is to understand whether past activities could have left something behind in the soil, groundwater, building materials, drains, or buried site features.

A former use does not automatically mean contamination. It means the next questions need to be more specific. An old repair shop might be fine, or it might have waste oil issues, floor drains, hydraulic lifts, stained soil, or old tanks. A former farm parcel might be fine, or it might have pesticide mixing areas, fuel storage, debris pits, or burn areas. The past use points the flashlight. It does not finish the investigation.

2. Were Underground or Aboveground Tanks Ever on the Property

Tanks are one of the most important things to ask about before buying commercial land. Everyone thinks of gas stations first, but fuel and storage tanks can also show up at farms, fleet yards, schools, older commercial buildings, industrial properties, maintenance shops, and facilities that once used heating oil.

The problem is not always the tank sitting there today. The problem may be what happened twenty years ago. A tank may have leaked, been removed without good documentation, been abandoned in place, or been replaced after soil around it was already affected. Petroleum can move through soil and, in some cases, reach groundwater. Cleanup can be expensive when contamination spreads beyond the original tank area.

A buyer should ask about underground tanks, aboveground tanks, fuel dispensers, vent pipes, fill ports, waste oil tanks, hydraulic lifts, stained pavement, and old tank closure reports. If a seller says the tanks were removed years ago, ask for the paperwork. Were soil samples collected? Was the removal reported? Did the agency issue closure? Did any contamination remain?

“The tanks are gone” is not the same thing as “the tank issue was handled correctly.”

3. What Did the Neighboring Properties Do

Environmental risk does not always stop at the property line. Groundwater can move. Vapors can move. Runoff can move. Historical contamination can migrate from one property to another, especially when nearby sites were used for fuel, solvents, metals, industrial work, waste disposal, or other activities that may have affected soil or water.

That is why the environmental review should look beyond the parcel being purchased. A clean-looking property beside any of the following may need more attention than the listing suggests:

The planned use matters too. A buyer planning equipment storage may evaluate risk differently than a buyer planning apartments, a childcare facility, a medical office, food service, or a public building. The property may be usable, but the level of investigation should match the future use.

A good environmental engineer looks at the surrounding area because the site is part of a larger environmental story.

4. Where Does the Water Go When It Rains

This sounds like a simple site question, and it is one of the most useful ones. Walk the property after a storm if you can. Look for ponding water, erosion, stained drainage paths, oily sheens, sediment buildup, stressed vegetation, low spots, storm drains, culverts, ditches, and places where runoff leaves the property.

Stormwater matters because water is one of the main ways problems move. It can carry sediment, petroleum, chemicals, metals, trash, and other materials from one area to another. It can also expose poor grading, drainage mistakes, and future construction headaches.

This question becomes even more important if the buyer plans to redevelop the property. A gravel yard, old warehouse, or vacant parcel may behave one way today and a very different way after buildings, pavement, sidewalks, parking lots, roof drains, and utilities are added. Development can trigger stormwater design, erosion control, drainage requirements, and construction-phase monitoring.

The plain-English rule is easy. If you do not know where the water goes, you do not understand the property yet.

5. Is Groundwater Shallow

Groundwater is the water below the ground surface. On some sites, it may be deeper than a buyer ever needs to think about. On other sites, it may be close enough to affect construction, contamination risk, basements, utility trenches, dewatering, drainage, and long-term maintenance.

Shallow groundwater can also change how environmental concerns behave. If a release occurred from an old tank, dry cleaner, industrial process, landfill, or neighboring property, groundwater may help move contaminants beyond the original source area.

A buyer should ask whether groundwater has been encountered nearby, whether wells exist in the area, whether past reports mention groundwater depth, and whether the planned construction could intercept water below the surface. This matters for developers, municipalities, lenders, and business owners because groundwater can affect both cost and timing.

A site may look dry at the surface and still have water-related issues underground.

6. Could Vapor Intrusion Be a Concern

Vapor intrusion sounds technical, but the basic idea is not hard to understand. Some chemicals in soil or groundwater can give off vapors. Those vapors can move through the ground and enter buildings through cracks, utility openings, floor drains, sumps, or other pathways.

This comes up most often with certain solvents and petroleum-related compounds. Former dry cleaners, degreasing operations, industrial facilities, fuel releases, and contaminated groundwater plumes can all raise vapor questions.

The tricky part is that vapor risk is not always obvious during a site visit. You may not see staining. You may not smell anything unusual. The concern may come from historical records, nearby contamination, groundwater data, or the planned building use.

Vapor intrusion becomes especially important when the property may be used for offices, housing, childcare, healthcare, retail, or any other purpose where people will spend a lot of time indoors. An environmental engineer can help decide whether vapor should be evaluated and what type of testing or mitigation may be appropriate.

7. Has Fill Material Been Brought Onto the Site

Fill is material brought onto a property to raise or level the ground. Clean fill can be useful. Unknown fill can be a headache in a work shirt.

Some fill is soil and rock. Some fill is a mix of brick, concrete, asphalt, ash, slag, metal, glass, demolition debris, or material from another site with its own history. A property may look flat and ready for development because someone made it that way years ago, but the material under the surface may not be suitable for the next use.

Unknown fill can create both environmental concerns and construction concerns. It may contain contaminants. It may settle unevenly. It may be difficult to excavate. It may require special handling if it is disturbed during construction.

Buyers should ask whether fill was imported, where it came from, when it was placed, and whether any testing or documentation exists. Old low areas, former ponds, drainageways, industrial parcels, demolition sites, and properties with uneven grades deserve a closer look.

Flat land is not always simple land.

8. Are There Old Wells, Septic Systems, Drains, Sumps, or Pits

Old site features can surprise a buyer after closing.

Wells may need to be properly abandoned. Septic systems may still be in the ground. Old drains may have discharged to unknown places. Sumps, pits, clarifiers, oil-water separators, floor drains, and old utility lines may create questions during redevelopment.

The concern may involve contamination, but cost and timing matter too. Finding an unknown feature during construction can stop work while the project team figures out what it is, who regulates it, and how it should be handled.

This is especially important on older commercial, agricultural, automotive, and industrial sites. An environmental engineer will look for clues during the site visit and records review. The goal is not to find every nail buried in the dirt. The goal is to reduce expensive surprises.

9. Are There Signs of Spills, Staining, or Poor Housekeeping

Sometimes the property gives hints. The following visible conditions all deserve attention:

• Stained soil or dark patches on pavement

• Chemical odors or stressed vegetation

• Abandoned drums or unlabeled containers

• Stained concrete, oily residue, or old equipment pads

• Debris piles, patched areas, or unusual drainage paths

A buyer should also look inside buildings. Floor drains, stained slabs, chemical storage areas, maintenance rooms, boiler rooms, loading docks, and storage corners can say a lot about how the property was used. The outside may be cleaned up for a showing while the old work areas still tell the truth.

Poor housekeeping does not automatically mean a major environmental problem. It does suggest that more questions are needed. If a property was used carefully, there may be records, labels, maintenance logs, and clear storage practices. If everything looks improvised, the buyer should be cautious.

A clean report starts with clean information, and messy sites often come with messy records.

10. What Records Exist, and What Records Are Missing

Documents are boring until they save the deal.

A seller may have any of the following on file:

• Tank closure reports and spill records

• Environmental studies and prior Phase I or Phase II reports

• Permits, agency correspondence, and cleanup letters

• Asbestos surveys and stormwater permits

• Waste disposal manifests and monitoring reports

Missing records can matter just as much. If everyone agrees that tanks existed but no closure documents are available, that is a question. If a prior cleanup is mentioned but no closure letter exists, that is a question. If old reports reference contamination but nobody can explain what happened next, that is a question. If a building appears to have had floor drains but nobody knows where they discharged, that is a question.

Missing records do not always mean disaster. They do mean the buyer should avoid guessing.

11. Has a Phase I Environmental Site Assessment Been Completed

A Phase I Environmental Site Assessment is one of the most common first steps in commercial real estate due diligence. In plain language, it is a structured review of the property to look for signs of possible environmental concerns.

A Phase I usually includes historical research, regulatory database review, a site visit, interviews, and a written report. It does not usually include soil, groundwater, or vapor testing. That surprises some buyers because they think they ordered “environmental testing” when they ordered an environmental review.

A Phase I can still be extremely valuable. It helps identify recognized environmental conditions and decide whether more investigation may be needed. It may also help buyers meet due diligence requirements connected to federal liability protections when it is completed correctly and within the right timing.

Order it early enough that the findings can still affect the deal. A report that arrives right before closing may create stress without giving the buyer much room to respond.

12. Does the Site Need a Phase II Environmental Site Assessment

The easiest way to think about the relationship between Phase I and Phase II work:

A Phase I asks whether there is a reason to suspect a problem. A Phase II collects data to better understand whether the problem exists and how serious it may be.

A Phase II may be recommended when the property has a history of tanks, spills, dry cleaning, industrial use, waste disposal, unknown fill, nearby contamination, staining, or other concerns. A lender, buyer, regulator, or redevelopment plan may also require more certainty before moving forward.

A Phase II can add cost and time. Still, it is usually better to know before closing than to discover contaminated soil during excavation for a foundation, utility trench, stormwater system, or parking lot.

13. What Will the Lender Require

Environmental due diligence is not only about the buyer’s comfort level. Lenders may have their own requirements, and those requirements can affect financing.

A lender may require a Phase I ESA before financing commercial property. If the Phase I identifies concerns, the lender may ask for a Phase II, clarification, reliance letters, cleanup estimates, environmental insurance, escrow, indemnities, or changes to the deal structure. Some lenders are more cautious with former gas stations, dry cleaners, industrial parcels, landfill-adjacent properties, and sites with known contamination.

Ask the lender early. Specific questions worth raising before work begins:

1. Does the lender require a Phase I ESA, and who must perform it?

2. What standard must the report meet?

3. How old can the report be at closing?

4. Does the lender need to be named as a relying party?

5. If concerns are found, what will the lender require before financing proceeds?

A strong environmental report should answer the right questions for the buyer, the lender, and the future project.

14. What Will the City, County, or Regulator Care About Later

A buyer may feel comfortable with the property and still run into government questions during redevelopment. Cities and counties may care about grading, drainage, stormwater, erosion control, utilities, floodplain issues, right-of-way work, wastewater, construction impacts, prior site conditions, and how soil will be handled during development.

This is where environmental engineering and civil engineering often overlap. Site history, grading, stormwater, utilities, drainage, construction sequencing, and environmental findings need to fit together. If the environmental report sits in a folder while the design team moves ahead without it, the project may run into avoidable problems later.

A buyer should ask what the local approval path may require before assuming the site is ready to build.

15. Could PFAS Be Part of the Conversation

PFAS is a group of chemicals that has received much more regulatory and public attention in recent years. A buyer does not need to panic about PFAS on every commercial parcel, but knowing when it may be worth asking about is useful.

PFAS may be relevant on sites with any of the following historical uses:

• Industrial facilities or plating operations

• Landfills or wastewater-related sites

• Airports or firefighting training areas

• Properties where PFAS-containing materials were used, stored, or released

The right approach is not blind testing on every deal. The right approach is a thoughtful question: based on the site history and surrounding uses, should PFAS be considered in the due diligence scope?

That question matters more now than it did years ago because PFAS regulations and liability discussions have continued to evolve. An environmental engineer can help determine whether PFAS belongs in the conversation or whether other risks deserve more attention first.

16. What Happens If the Property Has an Environmental Issue

Finding an issue does not always kill the deal. It may change the price, timeline, cleanup responsibilities, lender requirements, insurance needs, contract language, escrow amount, redevelopment plan, or closing conditions. In some cases, the buyer may walk away. In other cases, the buyer may move forward with a clearer understanding of the cost and risk.

The important part is to treat environmental findings as business information. A known issue can often be evaluated, priced, managed, or negotiated. An unknown issue discovered after closing is harder to control.

Not all issues carry the same weight:

A good environmental engineer can help explain the difference in normal language so the buyer can make a decision based on risk, cost, time, and future use.

17. Who Should Be Involved Before Closing

Commercial land purchases can involve a broker, buyer, seller, lender, attorney, title company, surveyor, civil engineer, environmental engineer, contractor, and sometimes a municipality or regulator. The whole cast does not need to attend every meeting, but the right people should be involved before the due diligence clock runs out.

At minimum, the buyer should have:

• A real estate attorney who understands environmental risk

• A lender who has clearly stated its requirements

• An environmental professional qualified to perform or review the appropriate level of assessment

If redevelopment is planned, the civil engineer or site designer should understand the environmental findings before design goes too far. This matters if soil will be moved, buildings will be demolished, utilities will be installed, pavement will be removed, stormwater systems will be redesigned, or the property will shift to a more sensitive use.

Land is never a blank slate. It has a memory, and the deal team should know how to read it.

Quick Red Flags Before Buying Commercial Land

Slow down if the property was ever used as any of the following:

Gas station · Dry cleaner · Auto repair shop · Junkyard · Machine shop · Metal plating operation · Landfill · Rail property · Farm chemical area · Maintenance yard · Industrial facility · Dumping area

Slow down if you observe any of the following on site:

Stained soil · Stressed vegetation · Chemical odors · Abandoned drums · Floor drains · Sumps · Old vent pipes · Patched pavement · Unlabeled tanks · Debris piles · Buried materials · Unknown fill · Records that do not match what is visible

Slow down if nearby properties have a history involving fuel, solvents, heavy industry, waste disposal, wastewater operations, or known contamination.

Slowing down does not mean walking away. It means asking better questions before the property becomes yours.

A Simple Pre-Purchase Checklist

Before closing on commercial land, work through the following:

• [ ] Ask what the property was used for in the past

• [ ] Ask what neighboring properties were used for in the past

• [ ] Ask whether underground or aboveground tanks were ever present

• [ ] Ask whether any spills, cleanup cases, violations, or regulatory files exist

• [ ] Ask whether the site has old drains, pits, wells, septic systems, sumps, or separators

• [ ] Ask where stormwater flows during heavy rain

• [ ] Ask whether groundwater is shallow or known to be impacted nearby

• [ ] Ask whether fill material was brought onto the property

• [ ] Ask whether vapor intrusion could be a concern based on site history or nearby contamination

• [ ] Ask whether a Phase I ESA has been completed recently

• [ ] Ask whether a Phase II ESA is recommended

• [ ] Ask what the lender requires

• [ ] Ask what the city or county may require for redevelopment

• [ ] Ask whether the purchase agreement gives enough time for environmental review and follow-up

• [ ] Ask who will pay for further investigation or cleanup if concerns are found

• [ ] Ask whether the findings affect the purchase price, schedule, financing, insurance, or future use

What a Good Environmental Engineer Brings to the Deal

A good environmental engineer helps the deal team understand what the findings mean, what they do not mean, and what should happen next. That is more useful than a report nobody understands sitting in a folder after closing.

The best support turns vague concern into practical decisions:

Is the issue manageable? Does it need testing? Should the buyer negotiate? Should the lender be looped in? Will construction be affected? Does the city need to know? Will the planned use make the risk more serious?

For developers, brokers, lenders, municipalities, and business owners, that clarity can protect the project before the project even starts. The real question is not only whether the buyer can purchase the land. The better question is whether the buyer can purchase it, finance it, permit it, build on it, operate it, and eventually sell it without getting blindsided by the ground beneath the deal.

Engineering Analytics provides environmental monitoring and compliance, Phase I and Phase II Environmental Site Assessments, remedial investigations, permitting support, and ongoing compliance services for public and private projects. For commercial parcels, redevelopment sites, industrial properties, water-related concerns, and complicated land histories, environmental site assessment support can help buyers understand the dirt before they own it.

Before the Deal Becomes Your Dirt

Commercial land deals often start with location, price, access, zoning, and future potential. Those things matter, but they do not tell the whole story. The ground may have a clean history. It may also have tanks, solvents, old fill, shallow groundwater, stormwater problems, neighboring contamination, missing records, or a past use that deserves attention before closing. Environmental due diligence is not about looking for reasons to ruin a deal. It is about understanding what kind of deal you are buying.

Ask the boring questions early. Ask what used to happen there. Ask where the water goes. Ask what happened next door. Ask what the lender needs. Ask what the city will care about later. Ask whether the site needs a Phase I or Phase II ESA.

Boring questions before closing are much cheaper than exciting surprises after closing.