We strive to be your go-to source for everything diesel exhaust fluid. Click the tabs to find out more about how we can help you with all of your Diesel Exhaust Fluid needs. You have enough to worry about in your operation, let us take care of all of your DEF needs.

Call us for service at the Sioux Center station 712-722-2501 or call Tyler at 712-578-9104

 We Specialize in Agricultural and Commercial Applications

TriState DEF is a Division of Cooperative Gas and Oil