Oklahoma Environmental
Practice Questions & Answers (2026)
Environmental questions on the Oklahoma exam cover both federal environmental laws and Oklahoma-specific disclosure requirements. Federal topics include lead-based paint (pre-1978 housing), asbestos, radon, underground storage tanks, and CERCLA liability. Oklahoma has additional state-level environmental disclosure requirements enforced by the Oklahoma Real Estate Commission (OREC) — including Oklahoma-specific environmental conditions that affect property use and disclosure. Environmental questions trip up candidates who studied only federal law without reviewing the OK-specific overlay.
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Oklahoma Environmental — Practice Questions & Answers
94 questions on Environmental from the Oklahoma real estate question bank. First 10 are free — sign up to unlock all 94.
Q1. Which federal law governs the cleanup of hazardous waste sites and assigns liability to responsible parties?
Explanation
CERCLA (Comprehensive Environmental Response, Compensation, and Liability Act), known as Superfund, provides a federal framework for cleaning up contaminated sites and holds current and past owners, operators, and waste generators liable for cleanup costs.
Q2. Lead-based paint disclosure is required for residential properties built before:
Explanation
Federal law requires disclosure of known lead-based paint hazards for residential properties built before 1978 (when the Consumer Product Safety Commission banned lead paint in residential housing). Sellers must provide a disclosure form and an EPA pamphlet.
Q3. Radon is a concern in real estate because it is:
Explanation
Radon is a naturally occurring colorless, odorless radioactive gas produced by the decay of uranium in soil and rock. It can seep into buildings and accumulate to dangerous levels. Long-term exposure is a leading cause of lung cancer.
Q4. Asbestos in older buildings becomes a health hazard primarily when it is:
Explanation
Asbestos is most hazardous when it is friable — damaged or disturbed so that fibers can become airborne and inhaled. Intact, undisturbed asbestos-containing materials generally do not pose an immediate health risk but should be monitored.
Q5. In Oklahoma, which environmental concern is particularly relevant to properties near oil and gas production sites?
Explanation
Oklahoma's extensive oil and gas industry creates environmental risks including soil and groundwater contamination from produced water spills, drilling fluid disposal, and pipeline leaks. Real estate professionals should be aware of nearby oil and gas activity when representing buyers.
Q6. Underground storage tanks (USTs) on a property are a concern because:
Explanation
USTs containing petroleum products or hazardous substances can corrode and leak, contaminating soil and groundwater. Buyers should investigate whether any USTs (including former ones) exist on the property and obtain environmental assessments.
Q7. A Phase I Environmental Site Assessment is designed to:
Explanation
A Phase I ESA identifies Recognized Environmental Conditions (RECs) through historical records review, regulatory database searches, and site inspection — but does not involve physical sampling. If RECs are found, a Phase II assessment with sampling may be needed.
Q8. The Oklahoma Corporation Commission (OCC) primarily regulates:
Explanation
The Oklahoma Corporation Commission regulates the exploration and production of oil, gas, and other minerals, including well permits, production regulations, and plugging of abandoned wells. Understanding OCC regulations is important for Oklahoma real estate agents dealing with properties that have or are near oil and gas activity.
Q9. Mold in a property is a material defect that must be disclosed under Oklahoma's:
Explanation
Known mold conditions are material defects that sellers must disclose under Oklahoma's Residential Property Condition Disclosure Act. Mold can cause health problems and significant property damage, making it a fact that materially affects a property's value or desirability.
Q10. The 'innocent landowner' defense under CERCLA protects:
Explanation
CERCLA's innocent landowner defense may protect a property owner who purchases contaminated land if they performed 'all appropriate inquiries' (Phase I ESA) and had no knowledge of contamination. Buyers should always conduct environmental due diligence.
Q11. Which of the following is a common environmental concern associated with older commercial buildings?
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