Delaware Environmental
Practice Questions & Answers (2026)
Environmental questions on the Delaware exam cover both federal environmental laws and Delaware-specific disclosure requirements. Federal topics include lead-based paint (pre-1978 housing), asbestos, radon, underground storage tanks, and CERCLA liability. Delaware has additional state-level environmental disclosure requirements enforced by the Delaware Real Estate Commission — including Delaware-specific environmental conditions that affect property use and disclosure. Environmental questions trip up candidates who studied only federal law without reviewing the DE-specific overlay.
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Delaware Environmental — Practice Questions & Answers
140 questions on Environmental from the Delaware real estate question bank. First 10 are free — sign up to unlock all 140.
Q1. Which federal law governs the cleanup of contaminated sites and is commonly known as 'Superfund'?
Explanation
The Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), also called Superfund, authorizes the federal government to clean up contaminated sites and hold responsible parties liable for costs.
Q2. Lead-based paint disclosure is required for properties built before:
Explanation
Federal law (RRPPA) requires sellers and landlords of properties built before 1978 to disclose known lead-based paint hazards and provide EPA's informational pamphlet.
Q3. Radon is a naturally occurring radioactive gas that enters homes primarily through:
Explanation
Radon is a colorless, odorless radioactive gas produced by the decay of uranium in soil and rock. It enters buildings through cracks and openings in foundations and is the second leading cause of lung cancer.
Q4. Asbestos found in a home poses the greatest health risk when it is:
Explanation
Friable asbestos—asbestos that can be crumbled by hand pressure and releases fibers—poses the greatest health risk because the airborne fibers can be inhaled and cause serious lung diseases.
Q5. An underground storage tank (UST) that has leaked petroleum products on a Delaware property would be of concern primarily because:
Explanation
Leaking USTs can contaminate soil and groundwater, creating environmental liability and requiring expensive remediation under federal and state regulations.
Q6. Which type of insulation material, commonly used before the 1980s, may be found in Delaware homes and is a health hazard?
Explanation
Urea-formaldehyde foam insulation (UFFI), used widely in the 1970s, was banned for residential use in 1982 because it releases formaldehyde gas, which is a health hazard.
Q7. Wetlands regulation in Delaware is primarily overseen by:
Explanation
DNREC is the primary state agency responsible for regulating wetlands, coastal zones, and environmental matters in Delaware, including issuing permits for activities affecting wetlands.
Q8. The EPA's required pamphlet for lead-based paint is called:
Explanation
The EPA requires distribution of the pamphlet titled 'Protect Your Family from Lead in Your Home' to buyers and tenants of pre-1978 housing as part of lead-based paint disclosure requirements.
Q9. Mold growth in a Delaware home is most commonly caused by:
Explanation
Mold requires moisture to grow. Excess humidity, water intrusion, and poor ventilation are the primary causes of mold growth in residential properties.
Q10. A Phase I Environmental Site Assessment primarily involves:
Explanation
A Phase I ESA is a non-invasive assessment that reviews historical records, regulatory databases, and conducts a site inspection to identify recognized environmental conditions (RECs) without soil or groundwater testing.
Q11. Polychlorinated biphenyls (PCBs) are commonly found in older buildings in:
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