Quick Answer: A sulfur or rotten egg smell from your water is usually caused by hydrogen sulfide gas, which can form in your water heater or well system. A metallic taste or smell points to corroding pipes. A musty or earthy smell often comes from bacteria in the water supply or within older plumbing. Identifying whether the smell comes from hot water only, cold water only, or both is the first step toward the right fix.
You fill a glass from the kitchen tap and something smells off. It might be faint, it might be strong, but either way it does not inspire confidence. Bad-smelling water is a surprisingly common complaint among Cypress, TX homeowners, and the cause is not always what you would expect.
The smell itself is a clue. Different odors point to different problems, and knowing the difference helps you avoid wasting money on the wrong solution.
Rotten Egg or Sulfur Smell
This is the most reported water odor in the Houston metro area, including Cypress and the surrounding communities. The culprit is almost always hydrogen sulfide gas, which forms when sulfur-reducing bacteria interact with naturally occurring sulfates in the water supply.
Here is the key diagnostic step. Run just the hot water and smell it. Then run just the cold water and smell it. If the sulfur smell is only present in the hot water, the problem is inside your water heater. The magnesium anode rod that protects your tank from corrosion can react with sulfates in the water and produce hydrogen sulfide. Replacing the anode rod or switching to an aluminum-zinc rod usually eliminates the smell.
If both hot and cold water carry the odor, the issue is in the water supply itself, not the heater. A whole-house water filtration system designed to address hydrogen sulfide can resolve this. The benefits of whole-house filtration extend well beyond odor, protecting your pipes, appliances, and your family’s health.
Metallic Taste or Smell
Water that tastes or smells like metal is picking up iron, copper, or zinc as it travels through your pipes. This is most common in homes with older galvanized steel or copper plumbing that has begun to corrode internally.
If the metallic quality is worst first thing in the morning (when water has been sitting in the pipes overnight) and improves after running the faucet for a minute, pipe corrosion is the likely cause. Over time, this same corrosion leads to low water pressure and eventually pipe failure.
Homes with hard water also tend to accelerate mineral buildup inside pipes, which compounds the issue. Filtration helps with the taste, but if the pipes are significantly corroded, water line replacement may be the lasting solution.
Chlorine or Chemical Smell
Municipal water in Cypress and the greater Houston area is treated with chlorine or chloramine to kill bacteria. Most of the time, the levels are low enough that you do not notice. But occasionally, especially after heavy rains or during seasonal treatment adjustments, the chlorine concentration increases and becomes noticeable at the tap.
This is generally not a health hazard at the levels used by Texas municipal water systems. The EPA’s Safe Drinking Water standards allow up to 4 mg/L of chlorine in treated water. However, if the taste or smell bothers you, a whole-house water filtration system with activated carbon filtration effectively removes chlorine and chloramine.
Musty or Earthy Smell
An earthy, dirt-like, or musty smell in your water usually comes from organic matter, specifically algae or bacteria, in the source water. This is more common during warmer months in Southeast Texas when algae blooms can affect surface water supplies.
The smell is unpleasant but typically not dangerous. If the musty smell is isolated to one faucet, the issue may be localized bacteria growth inside that specific fixture or drain, not the water supply itself. Cleaning or replacing the faucet aerator often resolves it.
If the smell is present at every tap in the house, a carbon-based filtration system is the most effective remedy.
Sewage Smell From the Drain, Not the Water
Sometimes what seems like smelly water is actually a drain problem. If the odor is strongest when you lean over the sink but the water itself smells fine once you catch it in a glass away from the drain, the source is your drain line, not your water supply.
A dry P-trap is a common cause. The P-trap is the curved section of pipe under your sink that holds a small amount of water to block sewer gases from entering your home. If a sink has not been used in a while, the water in the trap evaporates and gases seep through. Running the faucet for 30 seconds refills the trap and usually stops the smell.
If running water does not fix it, you may have a sewer line issue or a venting problem that needs professional attention. Gurgling drains paired with sewer odors are a strong indicator that the vent stack is blocked or the drain system has a deeper issue.
When to Call a Plumber
If you have identified that the smell is coming from your hot water only, a water heater anode rod replacement is a straightforward fix. If the odor is present in all water throughout the house, a filtration system is the answer. And if the smell is isolated to drains, the plumbing system itself needs inspection.
In any of these cases, a licensed plumber can pinpoint the exact cause in a single visit and recommend the right solution, not just a guess.
Clean Water Starts With the Right Diagnosis
If your water smells off in your Cypress, TX home, contact Go Green Plumbing at (281) 960-6576. We will figure out exactly what is causing it and give you options to fix it, with clear pricing and no surprises. Serving residential plumbing customers in Cypress and surrounding areas since 2008.
