Your home inspector spent two careful hours on the property and emailed you a 47-page report. Roof: 8 years left. HVAC: serviced last year. Foundation: minor settling cracks, watch them. You feel reassured.
Then a neighbor mentions, casually, that the empty lot two streets over “used to be a dry cleaner.” And you start Googling and find out the city had three water violations in five years. And the previous owner's asthmatic daughter moved out before middle school. And the back property line is in a 100-year flood zone you never asked about.
None of that was your inspector's job. Here's what is your job — and how to actually do it without becoming a part-time environmental scientist.
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Amount of off-property environmental risk a standard home inspection is required to assess.
ASHI / InterNACHI Standards of Practice
What a home inspection actually covers (and what it doesn't)
Under the ASHI and InterNACHI Standards of Practice — the two main licensing frameworks — an inspection covers visible, accessible conditions of the structure on the property. Specifically:
- ✅ Structural condition, roof, foundation, attic, basement
- ✅ Plumbing fixtures, water pressure, visible pipe condition
- ✅ Electrical panel, outlets, visible wiring
- ✅ HVAC, water heater, appliances
- ✅ Windows, doors, decks, visible exterior
- ❌ Mold testing, asbestos sampling, lead paint analysis
- ❌ Water quality testing, soil sampling
- ❌ Radon (unless added as a paid extra)
- ❌ Anything off-property — Superfund, industrial sites, flood maps, air quality
- ❌ Historical site use, prior land owners
The inspector may casually mention “there's a chemical plant down the road” if it's obvious. They are not required, trained, or insured to assess it.
The 7 off-property records every buyer should pull
- FEMA flood zone — msc.fema.gov. Don't trust the listing. See our flood zone guide (or, for low-risk parcels, what Zone X means for insurance).
- EPA ECHO water + air violations — echo.epa.gov. Search by utility and zip code.
- EPA Superfund / NPL — epa.gov/superfund. Look for sites within 1 mile.
- TRI (Toxics Release Inventory) — epa.gov/tri. Industrial facilities releasing chemicals.
- LUST (Leaking Underground Storage Tanks) — state environmental agencies. Old gas stations, dry cleaners.
- UCMR 5 PFAS detections — your local utility's page. New 2023–2025 data.
- Lead Service Line Inventory — required for every utility as of October 2024.
When you need more than records — Phase I ESA
A Phase I Environmental Site Assessment is a federally standardized review (ASTM E1527-21) done by a licensed environmental professional. It includes records search, a site walk, neighborhood reconnaissance, and interviews with owners and neighbors. Cost: $1,500–$3,500. Standard for commercial deals, rare for residential.
Get a Phase I if:
- The property was ever commercial or industrial (especially gas station, dry cleaner, auto shop, manufacturing)
- It's on or directly downgradient of a Superfund or LUST site
- Active records show recent contamination near the property line
- You see suspicious staining, distressed vegetation, or backfilled areas
- You're buying ag land that may have had pesticide storage
The big four indoor risks the inspection won't test
- Radon — Order the optional radon test. Always. $20 home kit if your inspector won't.
- Lead paint — Any home pre-1978. Federal disclosure required. $300–$600 for an inspection.
- Asbestos — Vinyl floor tile, popcorn ceiling, pipe insulation, siding in pre-1980 homes.
- Mold + IAQ — A separate $300–$500 service if anyone in the family has allergies or asthma.
Talk to the neighbors. Seriously.
Three minutes on the sidewalk with two neighbors will tell you more than any database. Ask:
- Does the street ever flood during heavy rain?
- How long has the family in the house been there? Why are they selling?
- Have you noticed any odors, smoke, or noise from nearby industry?
- Have you had your water tested recently?
- Anything you wish you'd known before moving in?
Frequently Asked Questions
▸Does a standard home inspection check for environmental hazards?
No. A standard ASHI/InterNACHI home inspection covers structure, roof, plumbing, electrical, HVAC, and visible defects inside the property line. It explicitly excludes mold testing, radon, asbestos, lead paint analysis, water quality testing, soil contamination, and anything off-property. Your inspector may flag obvious red flags (water stains, suspicious-looking soil) but is not licensed to assess them.
▸What is a Phase I Environmental Site Assessment?
A Phase I ESA is a professional records review and site walk-through done to a federal standard (ASTM E1527-21) — typically $1,500–$3,500. It's standard for commercial property purchases but rarely done for residential. If a property has known industrial history, is near a Superfund or LUST site, or shows signs of contamination, a Phase I is the gold standard. For most residential buyers, a $19.99 records screen catches the same red flags at a fraction of the cost.
▸How close is too close to a Superfund site?
There's no universal answer. EPA tracks Superfund sites because they have documented contamination, but exposure pathways depend on hydrology, soil, vapor intrusion, and groundwater flow. As a general rule: within 1 mile warrants investigation; within 0.25 mile or directly downgradient from an active cleanup warrants serious caution. The EnviroAtlas tool and EPA's Cleanups in My Community (CIMC) tool let you check any address.
▸Should I get a radon test as part of a home inspection?
Yes. Always. Radon causes ~21,000 lung cancer deaths a year in the U.S. and 1 in 15 homes has elevated levels. A 48-hour short-term test is $20–$50 (often bundled into inspections for $100). EPA Zone 1 states (PA, OH, IA, CO, MN, ND, SD, much of the Midwest and Northeast) have the highest risk, but elevated radon shows up everywhere. Mitigation costs $800–$2,500 — a routine fix, not a deal-breaker.
▸What if the house used to be a gas station or dry cleaner?
Then you have a vapor intrusion problem until proven otherwise. Underground storage tanks and dry-cleaning solvents (PCE, TCE) commonly leak and migrate. EPA's LUST (Leaking Underground Storage Tank) registry tracks these. If a property was ever commercial and you can't get full closure documentation, get a Phase I ESA. Don't trust 'it was cleaned up' without paperwork.
▸How do I check if there's lead paint in an older home?
Any home built before 1978 likely has lead paint somewhere. Federal law (Title X) requires sellers to disclose known lead paint. An EPA-certified lead inspector or RRP-certified contractor can test for $300–$600. Cheap home kits exist but are less reliable. The bigger risk is during renovation — anyone disturbing pre-1978 paint without proper containment is creating lead dust.
▸What environmental records should every buyer pull?
At minimum: FEMA flood zone, EPA ECHO (water + air violations), Superfund / NPL, TRI (Toxics Release Inventory), LUST (leaking tanks), radon zone, and the city's lead service line inventory. Doing this manually takes 1–2 hours per address across 6 different government portals. Aggregator services (including ours) bundle them for $19.99–$50 per address.
Bottom line
A clean inspection report is not a clean environmental report. Spend $19.99 on an aggregator (or 2 hours on federal portals), test for radon, talk to the neighbors, and pull the lead service line inventory. Cheap insurance against an expensive surprise.
Related: environmental risks to check before buying a house, drinking water quality checks, what is an EPA Superfund site.
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