New to this. I have an existing pond with leak. Want to get it lined. Is there any recommendation of pond builders in central Illinois (Bloomington area)

Take a look at the Pond Boss Resource Guide. Follow this link:
http://www.pondboss.com/Resources?lci=8

Good luck Pagramm. Being from the area I'm not sure there are any "official" pond builders.

You might contact N8ly, who lives in the Peoria area. He would be your best resource locally.

Boss