BRU Conventional Gas Farm-in potential, page-26

If you want to use gas for CNG, you don't use wet gas.
The gas has to be dried (water removed), and condensates removed.
If it is high in CO2/H2S that will have to be removed as well.
The gas will have to meet a certain specification, as the engines are set up to gas with that specification.
If the gas condensates are not removed the calorific Value is too high.
One of the specifications they will have to meet is the Wobbe Index. (Funny name, but not my invention)
Wobbe Index= gas density/square root of the heating value.

If not having the infra structure to sell gas liquids, it would be silly to produce it and burn it. That would be the only solution and you highly likely would not get permission to do that.
Therefore dry gas.
Water has to be removed otherwise your letdown pressure control valves (from gas tank to engine) would freeze up and can't work.
Would be a bit the same as having a stuck accelerator pedal.

For a company like WPL it is simple, they have to produce their gas to those specifications anyhow, all they have to do is compress it. I hope that explains it