Why Does My Tap Water Smell? Pool, Rotten Egg and Musty Odors Explained
A pool or bleach smell comes from the chloramine or chlorine your utility uses to disinfect water. A rotten egg smell is usually hydrogen sulfide, often from a water heater or a well. An earthy or musty taste usually comes from natural compounds called geosmin and MIB. Most of these odors are harmless, and carbon filtration removes them.
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Pool or Bleach Smell
Miami-Dade WASD disinfects with chloramine, a mix of chlorine and ammonia that lasts through long pipe runs. Homestead uses chlorine. Both keep water safe in the pipes, but many people notice the smell, especially in a hot shower. A whole-home carbon system like the Hydronex iGen C removes it at every tap. Read more about chloramine.
Rotten Egg Smell
This is hydrogen sulfide gas. A quick way to find the source:
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Only hot water smells? It's probably the water heater. Its magnesium anode rod can react with sulfate in the water. A plumber can swap the rod and flush the tank.
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Hot and cold both smell? On a private well, the gas may be in the groundwater. On city water, call your utility.
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Only one sink smells? It may be the drain. Fill a glass, step away and smell it again.
Earthy or Musty Taste
Geosmin and MIB are made by algae and bacteria in source water, especially in warm months. People can taste them at extremely low levels. They aren't considered a health risk, and carbon filtration removes them well.
Metallic Taste or Rusty Color
Usually iron or corrosion from older galvanized pipes, which are common in pre-1960s Miami homes. It's worth testing, because the same pipes can add lead. Learn more about lead in Miami water.
Quick Fix Guide
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Pool or bleach: whole-home carbon filtration.
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Rotten egg, hot water only: replace the anode rod and flush the tank.
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Rotten egg, all taps on a well: well water treatment.
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Earthy or musty: carbon filtration.
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Metallic or rusty: test for lead, then RO or re-pipe.
Common Questions
Is it safe to drink water that smells like chlorine? Yes. The disinfectant is there on purpose, at levels set by federal rules. Filtering it improves taste and smell.
Will a filter remove the smell? Carbon removes chlorine, chloramine, geosmin and MIB. Hydrogen sulfide from a well needs dedicated treatment.
Why does my water smell like rotten eggs? That's usually hydrogen sulfide. If only hot water smells, the water heater is a likely source. If all taps smell, it may be the water supply, especially on a well.
Why does my water taste earthy or musty? Natural compounds called geosmin and MIB, made by algae and soil bacteria, can cause it. They're harmless but noticeable. Carbon filtration removes them.
Why does only one faucet smell? Bacteria in the sink drain can cause odors. Fill a glass, step away from the sink and smell it to check whether the water or the drain is the source.
When should I worry about a smell? Call your utility if a smell or color change is sudden and widespread, or if your water smells like fuel or chemicals.