Colorado Environmental
Practice Questions & Answers (2026)
Environmental questions on the Colorado exam cover both federal environmental laws and Colorado-specific disclosure requirements. Federal topics include lead-based paint (pre-1978 housing), asbestos, radon, underground storage tanks, and CERCLA liability. Colorado has additional state-level environmental disclosure requirements enforced by the Colorado Division of Real Estate — including Colorado-specific environmental conditions that affect property use and disclosure. Environmental questions trip up candidates who studied only federal law without reviewing the CO-specific overlay.
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Colorado Environmental — Practice Questions & Answers
109 questions on Environmental from the Colorado real estate question bank. First 10 are free — sign up to unlock all 109.
Q1. A Colorado property built before 1978 may contain which hazardous material that requires disclosure under federal law?
Explanation
Federal law (TSCA Section 1018 and HUD/EPA rules) requires sellers and lessors of residential property built before 1978 to disclose known lead-based paint hazards and provide buyers with the EPA pamphlet 'Protect Your Family from Lead in Your Home.'
Q2. Colorado has some of the highest radon levels in the nation. Radon is:
Explanation
Radon is a colorless, odorless radioactive gas produced by the natural decay of uranium in soil, rock, and water. Colorado's geology makes radon a significant concern. The EPA recommends mitigation when levels exceed 4 picocuries per liter (pCi/L).
Q3. The Colorado Department of Public Health and Environment (CDPHE) oversees cleanup of contaminated properties under the:
Explanation
Colorado's Voluntary Cleanup Program (VCP) allows property owners to voluntarily remediate contaminated sites with CDPHE oversight. Federal CERCLA (Superfund) applies to the most seriously contaminated sites. Colorado also has state-specific hazardous substance regulations.
Q4. Asbestos-containing materials (ACM) in a Colorado building pose the greatest health risk when they are:
Explanation
Asbestos is most dangerous when it is friable — meaning it can be crumbled, pulverized, or reduced to powder by hand pressure, releasing fibers into the air. Intact asbestos that is not disturbed generally poses minimal risk but must be managed carefully during renovation.
Q5. Underground storage tanks (USTs) containing petroleum products are a concern in Colorado because they may:
Explanation
Leaking USTs can contaminate soil and groundwater, creating significant environmental liability. CERCLA and Colorado law may hold current property owners liable for cleanup costs even if they did not cause the contamination.
Q6. CERCLA (Superfund) is significant to Colorado real estate because it:
Explanation
CERCLA creates 'joint and several' liability for cleanup costs that can be imposed on current owners, former owners, operators, and those who arranged for disposal of hazardous substances. This makes environmental due diligence critical in Colorado real estate transactions.
Q7. A Phase I Environmental Site Assessment (ESA) in Colorado is primarily intended to:
Explanation
A Phase I ESA identifies Recognized Environmental Conditions (RECs) through research of historical records, regulatory databases, site reconnaissance, and interviews. It does NOT involve physical sampling. If RECs are identified, a Phase II ESA with actual sampling may follow.
Q8. Mold in a Colorado property is primarily a concern because exposure can cause:
Explanation
Mold exposure can cause respiratory problems, allergic reactions, and other health issues, particularly for sensitive individuals. Colorado brokers are required to disclose known mold issues as an adverse material fact. Moisture control is key to mold prevention.
Q9. A Colorado property is situated near a former dry-cleaning facility. The primary environmental concern would be contamination from:
Explanation
Dry cleaners historically used chlorinated solvents, primarily perchloroethylene (PCE/PERC) and trichloroethylene (TCE), which are common groundwater and soil contaminants. These chemicals are dense non-aqueous phase liquids (DNAPLs) that sink through groundwater and are difficult and expensive to remediate.
Q10. The Colorado Disclosure of Environmental Hazards form requires sellers to disclose knowledge of which conditions?
Explanation
Colorado's seller disclosure requirements cover any known or suspected environmental hazards, including radon, asbestos, lead paint, underground storage tanks, contamination, and proximity to hazardous waste facilities. Sellers disclose their actual knowledge.
Q11. The EPA's Action Level for radon in a building is:
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