6.1 Property Conditions and Environmental Hazards
Key Takeaways
- Lead-based paint disclosure under federal law applies to most housing built before 1978 and gives buyers a 10-day inspection window.
- Asbestos, radon, and mold are condition hazards a licensee must treat as material facts when known, even if no federal disclosure form exists.
- Radon is measured in picocuries per liter (pCi/L); the EPA action level is 4.0 pCi/L.
- Wetlands are federally regulated; filling or developing them without a permit triggers Clean Water Act and Army Corps of Engineers jurisdiction.
- A licensee discloses known environmental conditions but should refer technical evaluation to qualified inspectors, not guess at remediation cost.
Environmental hazards on the national exam
The national portion tests environmental hazards as material facts that affect health, value, or use. You are not asked to be an environmental engineer; you are asked to know what each hazard is, where it is found, the federal rule (if any), and the licensee's duty when the condition is known. The recurring trap is confusing a disclosure duty (tell what you know) with an inspection or remediation duty (find and fix), which belongs to qualified professionals.
Lead-based paint
Lead-based paint is the most heavily tested hazard because it has a specific federal law: the Residential Lead-Based Paint Hazard Reduction Act of 1992 (Title X), enforced through EPA/HUD regulations. Lead was banned from residential paint in 1978, so the rule targets target housing — most residential dwellings built before 1978.
For a covered sale or lease, the seller or landlord must:
- Disclose any known lead-based paint or hazards and provide available records/reports.
- Give the buyer or tenant the EPA pamphlet "Protect Your Family From Lead in Your Home."
- Include a Lead Warning Statement and signatures in the contract.
- Give the buyer a 10-day period to conduct a lead inspection or risk assessment (the buyer may waive it; the 10 days is the default and is negotiable in length only by mutual agreement).
Exemptions include housing built 1978 or later, zero-bedroom units (studios, lofts), senior/handicapped housing with no children, short-term rentals (under 100 days), and foreclosure sales. The licensee is responsible for ensuring the seller complies and must not coach a seller to conceal known lead.
Asbestos
Asbestos is a fibrous mineral once prized for fire resistance and insulation. It is dangerous only when friable — crumbling so fibers become airborne — which can cause asbestosis and mesothelioma. It is commonly found in pre-1980 homes in pipe and duct insulation, floor tiles, roofing, siding, and popcorn ceilings.
The key exam point: intact, undisturbed asbestos is often safer left in place (encapsulation) than removed, because removal disturbs fibers. There is no single federal disclosure form for asbestos in a typical home sale, but if the licensee or seller knows of asbestos, it is a material fact requiring disclosure.
Radon
Radon is a colorless, odorless, radioactive gas produced by the natural decay of uranium in soil and rock. It seeps into homes through foundation cracks, sump pits, and slab joints, and is the second-leading cause of lung cancer after smoking. Radon is a regional concern; it concentrates in basements and lower levels.
Memorize the measurement and threshold:
| Item | Value |
|---|---|
| Unit of measure | Picocuries per liter (pCi/L) |
| EPA action level | 4.0 pCi/L |
| Common mitigation | Sub-slab depressurization (vent fan/pipe) |
| Typical mitigation cost | A few thousand dollars |
If a test reads 4.0 pCi/L or higher, the EPA recommends mitigation. A mitigation system uses a fan and vent pipe to draw soil gas out before it enters the home — it does not require demolition.
Mold
Mold grows wherever there is moisture, organic material, and warmth — behind drywall, under carpet, in attics, and around plumbing leaks. Some molds produce allergens or mycotoxins. There is no federal EPA action level for residential mold the way there is for radon, and no single federal disclosure form, so examiners test the concept: control moisture to control mold, and disclose known mold or water-intrusion history as a material fact. A licensee should never assure a buyer that visible staining is "just cosmetic."
Wetlands
Wetlands are areas saturated by surface or ground water enough to support water-adapted vegetation — marshes, swamps, bogs. They are protected under the federal Clean Water Act, with permitting authority through the U.S. Army Corps of Engineers. A buyer who plans to fill, drain, or build on wetlands generally needs a federal permit; doing so without one can trigger fines and restoration orders. This is a land-use and value issue: wetlands can sharply limit buildable area, so the licensee should flag suspected wetlands and refer the buyer to the Corps or a wetlands consultant.
Worked example: routing a hazard
A seller of a 1972 home mentions the basement "sometimes smells musty after rain" and that a prior radon test read 5.1 pCi/L. How should the licensee respond?
- Lead: Built pre-1978, so the federal lead disclosure, pamphlet, and 10-day window apply.
- Radon: 5.1 pCi/L exceeds the 4.0 action level — a known material fact; disclose and recommend professional mitigation/retest.
- Mold: The musty smell plus water intrusion is a known condition to disclose; recommend an inspection rather than diagnosing it.
The licensee discloses all three knowns and refers the technical work out — never minimizing or self-certifying that the conditions are harmless.
Underground Tanks, Groundwater, and Routing Duties
A few additional hazards round out the property-condition material, and the recurring theme is the same: disclose what is known, and refer technical work to professionals.
- Underground storage tanks (USTs): old heating-oil or fuel tanks can leak and contaminate soil and groundwater. They are regulated by the EPA, and a leaking tank can trigger cleanup liability. A buyer of a property with a suspected UST should commission a professional assessment before closing.
- Groundwater and well/septic: rural properties relying on a private well and septic system need testing for potability and septic function; a failed septic field is a costly, often latent defect that must be disclosed if known.
- Carbon monoxide and combustion safety: faulty furnaces and water heaters can produce CO; many jurisdictions require detectors, and a known defective heating system is a material fact.
Worked routing example: A 1968 farmhouse on a private well has a buried oil tank of unknown condition and a septic system the seller says "works fine." The licensee's correct actions are: (1) apply the federal lead disclosure because the home predates 1978; (2) disclose the known UST and septic information as material facts; and (3) recommend a UST assessment, well-water test, and septic inspection by qualified professionals. The licensee never certifies the tank is sound or the water is safe — that exceeds their competence and invites liability.
Underground Tanks, Groundwater, and Routing Duties
A few additional hazards round out the property-condition material, and the recurring theme is the same: disclose what is known, and refer technical work to professionals.
- Underground storage tanks (USTs): old heating-oil or fuel tanks can leak and contaminate soil and groundwater. They are regulated by the EPA, and a leaking tank can trigger cleanup liability. A buyer of a property with a suspected UST should commission a professional assessment before closing.
- Groundwater and well/septic: rural properties relying on a private well and septic system need testing for potability and septic function; a failed septic field is a costly, often latent defect that must be disclosed if known.
- Carbon monoxide and combustion safety: faulty furnaces and water heaters can produce CO; many jurisdictions require detectors, and a known defective heating system is a material fact.
Worked routing example: A 1968 farmhouse on a private well has a buried oil tank of unknown condition and a septic system the seller says "works fine." The licensee's correct actions are: (1) apply the federal lead disclosure because the home predates 1978; (2) disclose the known UST and septic information as material facts; and (3) recommend a UST assessment, well-water test, and septic inspection by qualified professionals. The licensee never certifies the tank is sound or the water is safe — that exceeds their competence and invites liability.
Under the federal lead-based paint rule, which housing is generally covered and what window must the buyer receive?
A radon test returns a reading of 4.0 pCi/L. What does the EPA recommend, and what does the unit measure?