The Environmental Technology Verification (ETV) Program has begun by the U.S. Environmental Protection Agency in 1995 to accelerate the commercialization of innovative or improved environmental technologies through third-party verification of their performance. During its pilot period, 1995-2000, up to 12 pilot programs operated in the market-based verification process involving nonprofit private/public partnerships. The ETV Program is a voluntary (nonregulatory) program which is restricted to commercially ready technologies and uses credible independent testing organizations to execute peer-reviewed test/quality assurance plans. Accomplishments of the ETV Program are summarized and lesson learned during the pilot period are discussed. Restructuring of the pilot programs into six centers began in late 2000 and is noted briefly. Discussed in detail is the Air Pollution Control Technology Verification Center, including its organization, operational features, technology areas of interest, and verifications performed.