Environmental Expo Houston. Calling all environmental service professionals in the Houston, TX area – the World’s Largest Environmental Expo is happening at the end of the month! This environmental expo is not taking place in Houston, but it’s just a short flight away. If you want to see the latest developments in the environmental industry, attend the Pumper-Cleaner Environmental Expo in Indianapolis. The cured-in-place-pipe sector is going to be a huge hit this year – make sure you visit Booth 7025! If you live in Houston and are interested in attending the Pumper-Cleaner Environmental Expo – contact info@perma-liner.com to learn how to get a Free Pass!