A hypothetical setup

This is an illustration. The household, the house and the dates are invented, and nothing here describes real work performed for a real customer. It shows how one clue, the smell appearing only with hot water, changes the list of suspects.

The imagined household notices a rotten-egg smell in a bathroom when the hot tap runs. The cold tap is clean, and the smell is absent when no water is running. They worry first about natural gas, then about sewer gas, and are unsure whom to call.

Sorting the first clues

The sulfur family of smells has several sources. Safety comes first.

  • IfThe smell is in the air with no water running, or is strong near a gas applianceThenLeave the house and call the gas utility's emergency line from outside, and do not operate switches.
  • IfThe smell appears at a drain whatever the temperatureThenLook at traps and venting before blaming the water supply.
  • IfThe smell appears only with hot water and the cold tap is cleanThenSuspect the water heater, often a reaction involving the tank's anode rod, and ask a plumber to check it.
  • IfThe smell appears in both hot and cold waterThenThe water supply may carry the smell, so ask the local water provider what it can tell you.

How the imagined household proceeds

Illustrative example. Not a real job or customer.

The household smells cold water first, then hot, and finds only hot water has the smell. There is no smell in the air with the water off.

  1. They confirm no gas smell exists near the furnace, stove and water heater with all taps closed.
  2. They run hot water at two different faucets on different floors and find the same smell at both.
  3. They note that the water heater was turned down low during a long absence and has just been turned back up.
  4. They contact a plumber to ask about the water heater, the anode rod and whether flushing the tank would be appropriate.
  5. They keep notes of when the smell appears so the plumber has a pattern.

In the imagined outcome, the plumber explains that conditions inside the tank can produce a sulfur smell when it sits at lower temperatures, and recommends maintenance steps for that tank. The smell fades after the work. The result is invented to show the reasoning, not to prescribe a fix.

Common questions

Is this a real customer story?

No. It is a made-up example for illustration.

Should I adjust my water heater myself?

Check the maker's instructions and consider asking a qualified plumber, because temperature settings affect safety.

General information for Highlands Ranch, not a quote or professional advice. In an emergency, call 911.