I notice a small puddle of water under my front bumper. It is towards the center and more on the passenger side.

I took it to a shop and they said it was not the coolant.

Does anyone know what this could be?

Running your AC? Probably just condenser water...

Yep A/C .

so nothing to worry about i guess?

so, you took it to a shop and they told you what it wasn't, but couldn't tell you what it was?

As other said, most likely A/C - every car and truck with A/C will "puddle" from condensation and it's usually on the front passenger side. Not sure where you're located but you really see it in humid climates - you've never noticed before?

if you need something to worry about, you could use that...