The background and current status of the Environmental Lead Proficiency Analytical Testing (ELPAT) program was presented. The program enables environmental lead (7439921) (Pb) analysis of paint chips, dusts, and soils. Performance evaluation of ELPAT was based on the participating laboratories meeting the reference laboratory requirements of an industrial hygiene proficiency exam and performing well in a recent Environmental Protection Agency (EPA) sponsored interlaboratory evaluation of sample digestion techniques (microwave and hotplate) used to analyze paint chip and soil samples. Performance limits were designated and were the same criteria used by NIOSH to establish acceptable and outlier performance of industrial hygiene laboratories in other proficiency analytical testing programs. A laboratory was proficient for the Pb matrix if all four results from a total of four rounds were designated as acceptable for the last two consecutive rounds or if three fourths or more of the results in the last four consecutive rounds were designated acceptable. For ELPAT Round-1, samples of paint chips were collected from a hospital built in the late 19th century, a warehouse, and a military base. Samples were tested by the 110 enrolled laboratories and 104 submitted results. Relative standard deviations ranged from 7% to 15% for paint chips, 8% to 12% for soils, and 10% to 14% for dust wipes, indicating good agreement among the laboratories. The percentage identified as outliers was under 13% for paint chips, 7% to 8% for soils, and 7% to 10% for dust wipes. Proficiency ratings were tabulated, as was a summary of outliers for the three Pb matrices by the digestion and analytical method. Results of the microwave and hotplate techniques were presented. Certified reference material were listed. The EPA National Lead Laboratory Accreditation Program requirements were outlined. Data from ELPAT Round-2 were expected.