Kitchen faucet water smells like mildew

Got a new rv and the water coming from the kitchen faucet smells like mildew. It has gotten stronger smell over time. If I let it run a while it gets better. I took the sprayer head apart and cleaned but it didn't help. We are hooked up to well water right now. Also, its only the kitchen faucet. Not the bathroom. I am baffled.
Anyone had this happen? Its making me crazy.
Thanks