Is there a way to test for glycol in water without sending it into a lab?

Answer 1

That's a very easy answer: no. If you happen to have access to lab equipment yourself you can do it yourself, but one way or another you need specialized instruments.

Unless you're just trying to determine if there is or isn't glycol in a water sample. In which case you could taste it, because it sure tastes different from water. However, if you have an unknown mixture of stuff and you don't know what's in it, tasting it is not very smart.

EDIT: Actually, duh. Try freezing it. If it has significant amounts of glycol in it the freezing point will be significantly less than zero (or 32 F). Depending on how good your thermometer is you could possibly figure out quantitatively how much glycol is in there, but most thermometers are not too accurate.