Water Smells Like Rotten Eggs in Cooper City

Narrow it down in five minutes

1. Smell cold water at the kitchen sink, away from the drain.
2. Smell hot water at the same tap.
3. Check a bathroom and, if you have one, the sprinkler or outdoor spigot fed by a well.

• Hot only: water heater.
• Outdoors only: irrigation well.
• Everywhere, cold too, on a well: the well water itself.
• Only near one sink: possibly the drain trap.

City water and the water heater

Cooper City water is membrane-treated and chlorinated, and the 2025 report shows it meeting all standards. A sulfur smell limited to the hot side is a water heater issue. Magnesium anode rods can react with sulfate and bacteria in the tank, especially in a heater that sits unused, such as during a long vacation. Flushing the tank or changing the anode type, done by a plumber or per the heater maker's guidance, usually solves it. A whole-home filter before the heater will not, because the smell forms inside the tank.

Wells and hydrogen sulfide

Groundwater can carry hydrogen sulfide naturally. On a well, the smell usually appears in hot and cold water and can be stronger first thing in the morning. Treatment depends on the level and on iron and pH: aeration, oxidation followed by filtration, or catalytic media. See aeration vs. filtration for sulfur smells.

When to call the city

If cold city water smells unusual at every tap, call Cooper City Utilities at (954) 434-5519. Note that during free chlorination periods, like the one the city ran in 2025, a stronger chlorine smell is expected; that is different from a rotten-egg smell.

What Jorge tests

• Hot and cold samples to separate heater from supply.
• Iron, pH and hardness on well water, which shape sulfur treatment.
• Chlorine on city water.

For wells, Living Water configures a well water system from the test. See well water in Cooper City.

Vacant homes and seasonal use

Water that sits in a heater for weeks, for example while a home is listed for sale or the owners travel, is more likely to develop a sulfur smell. Running hot water at every tap for a few minutes after a long absence often clears a mild case. If the smell returns quickly, the heater needs attention.

Get it checked

Call, text or WhatsApp Jorge at (305) 793-5974.

Updated 2026-10-17 · Living Waters · Jorge Canela, Water Quality Specialist