Common Causes of Smelly Water
One of the most common complaints plumbers hear from homeowners is, “My water stinks.” Whether the smell resembles rotten eggs, sulfur, metal, or mustiness, unpleasant odors coming from your water are never normal. While the issue can be alarming, it is often caused by identifiable and treatable plumbing or water quality problems.
Rotten Egg or Sulfur Smell
A sulfur-like odor is one of the most frequently reported water complaints. This smell is typically caused by hydrogen sulfide gas, which can occur naturally in groundwater or develop inside plumbing systems. In many cases, the smell becomes stronger when hot water is running.
If the odor is only present in hot water, the likely cause is a reaction between bacteria and the anode rod inside the water heater. Replacing the anode rod or flushing the tank often resolves the issue.
Metallic or Rusty Odors
Water that smells metallic or tastes like iron often indicates corroding pipes or high iron content in the water supply. Older homes with aging pipes are especially prone to this issue. Corrosion can also lead to discoloration and reduced pipe lifespan if left unaddressed.
Musty or Earthy Smells
Musty odors are usually linked to organic matter, such as decaying leaves or sediment, entering the water supply. This is more common in well water systems but can also occur in municipal systems after maintenance or heavy rainfall.
Chlorine or Chemical Odors
Strong chlorine smells may occur after municipal water treatment adjustments. While chlorine is used to disinfect water, excessive odor can cause skin irritation and unpleasant taste.
Plumbing-Related Causes
Sometimes the smell isn’t coming from the water itself but from plumbing components. Dry drain traps, bacteria buildup in fixtures, or clogged vents can release sewer-like odors that appear to come from faucets.
How to Identify the Source
A simple way to narrow down the cause is to determine:
• Whether the smell occurs in hot water, cold water, or both
• If the odor is present at all fixtures or only one
• Whether it appeared suddenly or gradually
These clues help plumbers diagnose the problem quickly.
Solutions and Prevention
Depending on the cause, solutions may include:
• Water heater maintenance
• Pipe inspection or replacement
• Water filtration or treatment systems
• Fixture cleaning and trap refilling
Final Thoughts
Unpleasant water odors are more than an inconvenience. They can signal plumbing problems, water quality concerns, or system inefficiencies. Addressing the issue early ensures cleaner water, protects plumbing components, and restores peace of mind.
