Few things are more unsettling than turning on your faucet and being greeted by a foul odor. Whether it smells like rotten eggs, chlorine, or even metal, smelly tap water can disrupt daily routines and raise serious concerns about water safety. Many homeowners immediately wonder: Is this dangerous? Do I need a plumber right away? If you’re experiencing unpleasant tap water odors, it may be time to consult a plumber in San Anselmo to identify the root cause and restore your home’s water quality. This guide explains the 8 most common causes of smelly tap water and provides practical fixes you can try today. 1. Rotten Egg Smell: Hydrogen Sulfide in Water One of the most frequent complaints homeowners report is water that smells like rotten eggs. This usually comes from hydrogen sulfide gas , which forms when sulfur bacteria grow inside water heaters or plumbing lines. Fix: Flush your water heater and disinfect the tank. Install an activated carbon filter or aeration system. ...