Lead Paint Risk Assessment Calculator
Assess the risk level of lead paint exposure based on building age, paint condition, surface area, and occupant vulnerability. Based on EPA HUD guidelines for lead-based paint risk assessment.
Buildings built before 1978 may contain lead-based paint.
Total painted surface area that may contain lead paint.
Formula
Total Risk Score (TRS) = Age Score + Condition Score + Location Score + Area Score + Vulnerability Score + Renovation Score
- Age Score: ≥1978 = 0 | 1960–1977 = 2 | 1940–1959 = 3 | <1940 = 4
- Condition Score: Intact = 1 | Fair = 2 | Poor = 3 | Very Poor = 4
- Location Score: Non-friction interior = 1 | Exterior = 2 | Friction surface = 3 | Impact/chewable = 4
- Area Score: <100 sq ft = 1 | 100–499 = 2 | 500–999 = 3 | ≥1000 = 4
- Vulnerability Score: Children <6 present = +3 | Pregnant women = +2 (max 5)
- Renovation Score: Recent disturbance = +3
- Maximum Score: 24
Risk Classification: 0–4 = Minimal | 5–9 = Low | 10–14 = Moderate | 15–19 = High | 20–24 = Very High
Assumptions & References
- Lead-based paint was banned for residential use in the United States in 1978 (Consumer Product Safety Commission).
- Pre-1940 buildings have the highest probability of lead paint with concentrations often exceeding 1 mg/cm² (EPA standard threshold).
- Risk scoring methodology is adapted from the HUD Guidelines for the Evaluation and Control of Lead-Based Paint Hazards in Housing (2012) and EPA 40 CFR Part 745.
- Friction and impact surfaces generate lead dust at significantly higher rates than intact non-friction surfaces (EPA/HUD dust-wipe standards: 40 µg/ft² floors, 250 µg/ft² window sills).
- Children under 6 and pregnant women are classified as high-risk populations per CDC and WHO guidelines due to neurological developmental sensitivity to lead exposure.
- Renovation, Repair, and Painting (RRP) Rule (EPA 40 CFR Part 745.80) requires certified contractors for work disturbing lead paint in pre-1978 housing.
- This calculator provides a screening-level risk estimate only. A certified lead inspector or risk assessor should conduct formal testing (XRF analysis, paint chip sampling, dust-wipe sampling) for regulatory compliance.
- Blood lead level (BLL) reference value: CDC reference level is 3.5 µg/dL for children; no safe level of lead exposure has been identified.