Lead Paint in Pre-1978 Housing: A Field Guide for Families and Renovators
An evidence-based protocol for identification, containment, and pediatric monitoring — aligned with EPA, HUD, and CDC guidance.
Lead-based paint was banned for residential use in the United States in 1978. Yet according to the most recent **American Housing Survey**, an estimated 24 million U.S. homes still contain lead-based paint hazards — deteriorating paint, contaminated dust, or impacted soil — and roughly 3.6 million of those homes house at least one child under the age of six. The arithmetic is well-established in the public-health literature: there is no safe level of lead exposure in children.
paint hazards (HUD)
child under six
blood lead reference
## Identifying lead hazards in your home
The presence of lead-based paint is determined by inspection. The presence of an active *hazard* — meaning paint that is deteriorating, dust contaminated above EPA thresholds, or soil exceeding 200 ppm in play areas — is determined by a separate process called a **risk assessment**. For a family with young children, a risk assessment is almost always the more useful instrument.
X-Ray Fluorescence Field Testing
XRF instruments emit a low-energy X-ray beam at the painted surface. Lead atoms in the paint film fluoresce at characteristic energies (10.5 keV K-alpha, 12.6 keV K-beta), which the detector quantifies in milligrams per square centimeter (mg/cm²). The HUD positive threshold is **1.0 mg/cm²**.
1. Surface is cleaned of debris; instrument is calibrated against a standardized lead-paint film.
2. The probe is placed in direct contact with the surface for 3–10 seconds per reading.
3. Readings are taken at multiple points per painted component (door, window, wall section).
4. Inconclusive readings (between 0.5 and 1.0 mg/cm²) are confirmed by laboratory paint-chip analysis (NIOSH 7082).
## The EPA Renovation, Repair and Painting Rule
The Renovation, Repair and Painting (RRP) Rule, finalized by EPA in 2008 and effective for child-occupied facilities since 2010, requires that any contractor disturbing more than six square feet of painted surface in a pre-1978 home hold an EPA RRP certification. The rule’s core innovation is procedural: **containment first, dust control during, verification after**.
If your contractor cannot produce an EPA RRP firm certificate and individual renovator certification, do not allow work to begin. The EPA maintains a public lookup at epa.gov/lead/find-rrp-firm. Verification takes under two minutes.
The four-step containment protocol is straightforward in principle and brutally specific in execution. Plastic sheeting is taped to the floor and ceiling around the work area. HEPA-equipped vacuums replace conventional shop-vacs. A wipe-test with EPA-validated thresholds (10 µg/ft² on floors, 100 µg/ft² on window sills) is the only acceptable signoff.
## Pediatric blood lead screening
The American Academy of Pediatrics and the CDC recommend blood lead screening at **12 and 24 months** for children residing in high-risk ZIP codes, including those with significant pre-1978 housing stock. Children covered by Medicaid are required to be tested at these ages under federal EPSDT rules. A capillary (finger-stick) sample exceeding 3.5 µg/dL must be confirmed by a venous draw before action thresholds are triggered.
### What happens if a child tests above 3.5 µg/dL?
The CDC’s case-management guidance is graded by blood lead level. Levels between 3.5 and 19 µg/dL trigger environmental investigation and nutritional counseling. Levels of 20 µg/dL and above trigger expedited investigation, lab confirmation within 48 hours, and consideration of medical management with abdominal X-ray (to assess for ingested chips) and possible chelation therapy at higher concentrations.
References & Sources Consulted
- U.S. Department of Housing and Urban Development. American Healthy Homes Survey II. Office of Lead Hazard Control and Healthy Homes; 2021.
- Lanphear BP, Hornung R, Khoury J, et al. Low-level environmental lead exposure and children’s intellectual function: an international pooled analysis. Environ Health Perspect. 2005;113(7):894–899.
- U.S. Environmental Protection Agency. Lead; Renovation, Repair, and Painting Program. 40 CFR Part 745; effective April 22, 2010.
- U.S. Environmental Protection Agency. Hazard Standards and Clearance Levels for Lead in Paint, Dust and Soil. Final Rule, 84 FR 32632; July 9, 2019.
- Centers for Medicare & Medicaid Services. EPSDT: A Guide for States — Coverage in the Medicaid Benefit for Children and Adolescents. 2024 update.
- Centers for Disease Control and Prevention. Recommended Actions Based on Blood Lead Level. Childhood Lead Poisoning Prevention Program; 2024.