Paint is lead-based if it:
contains lead in a concentration of at least one-half of one percent (5,000 parts per million) or more by dry weight as measured by atomic absorption spectrophotometry or by quantitative chemical analyses; or
registers at least one milligram of lead per square centimeter or more as measured by an x-ray fluorescence analyzer, unless atomic absorption spectrophotometry or quantitative chemical analyses shows that the lead content is less than one-half of one percent by dry weight.
Dust is lead-contaminated if atomic absorption spectrophotometry or quantitative chemical analyses determines that it contains at least:
40 micrograms of lead per square foot on an interior hard-surfaced floor or carpet;
250 micrograms of lead per square foot on an interior window sill; or
400 micrograms of lead per square foot in a window trough.
Bare soil on an affected property or on a play area is lead-contaminated if it contains lead in a concentration of at least 1/100 of one percent (100 parts per million) by weight.
Drinking water is lead-contaminated if it contains at least 15 micrograms of lead per liter of water.
MS s 144.9508
29 SR 531
November 29, 2004