Coach is a Solitude ST 360RL

I live in my coach (summer only) for the last three years. I have flushed all water lines every year because I winterize it with RV coolant. I wash out the lines to get rid of the “pink stuff taste”.

Ok here is the problem. The water in the bath has a awful smell and a worst taste (not pink). It is somewhat like rotten eggs but not quite —just really bad😩.

The water in the kitchen is just fine — no bad smell/taste. I am NOT using the fresh water tank. I only use direct water from the outside faucet. The water at the hose entering the coach taste fine.

Remember this has been a long term problem.

Any ideas why this it happening.

Thanks