& Verified Answers | Lead-Based Paint Risk Assessment &
Regulations Review | 2026–2027
, ug/g microgram per gram
ug/ft2 microgram per foot square (dust sampling)
mg/cm2 milligrams per centimeter squared (XRF)
ug/dL microgram per deci-liter
ug/m3 microgram per deci-liter (quantity in blood)
1% 10,000 ppm
Allowed quantity of lead in dry surface paint when testing 1.0 mg/cm2
with XRF.
Allowed quantity of lead in dry surface paint when testing 5000 ppm
with paint chip
Allowed quantity of lead in dry surface paint by weight .5% = 5000ppm
Lead Quantities for Dust Clearance from floors/carpet 40 ug/ft2
Lead Quantities for Dust Clearance from furniture 40 ug/ft2
Lead Quantities for Dust Clearance from window sills 250 ug/ft2
Lead Quantities for Dust Clearance from window wells 400 ug/ft2
Lead Quantities for Dust Clearance from outside concrete 800 ug/ft2
Lead Quantities for Soil Clearance in contact areas 400 ppm