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When your water smells or tastes off, it’s unsettling. Some causes are harmless (if unpleasant), while others indicate real problems. Here’s what our plumbing team checks based on the specific smell or taste.
Rotten Egg Smell (Sulfur/Hydrogen Sulfide)
Hot water only: The anode rod in your water heater is reacting with sulfate-reducing bacteria. This is the most common cause. The magnesium anode rod (designed to protect the tank from corrosion) creates hydrogen sulfide gas as a byproduct of its reaction with bacteria naturally present in the water.
Fix: Replace the magnesium anode rod with an aluminum/zinc rod, or install a powered anode that eliminates the reaction entirely. Flushing the tank and treating with hydrogen peroxide can provide temporary relief.
Hot AND cold water: The source water itself contains hydrogen sulfide — more common in well water than municipal. Concentrations above 1 ppm create a noticeable odor.
Fix: A whole-home aeration system or activated carbon filter removes hydrogen sulfide. For well water, a chlorination system followed by carbon filtration is effective.
Only at one faucet: The drain, not the water, is the source. Bacteria in the P-trap or drain body produce the odor. Run water for 30 seconds — if the smell goes away, it was the drain. Clean the drain and overflow.
Chlorine or Chemical Smell
Municipal water is treated with chlorine or chloramines to kill bacteria. Most people don’t notice the treatment levels, but some are more sensitive — and levels can fluctuate seasonally (higher in summer when bacterial growth risk increases).
Fix: A whole-home carbon filter removes chlorine and chloramines, improving taste and odor at every faucet. A point-of-use filter at the kitchen sink addresses drinking water specifically.
This is not a health concern at municipal treatment levels — it’s a quality and preference issue.
Metallic Taste
Copper taste: Common in homes with copper pipes, especially newer installations. Copper leaches into standing water, particularly acidic water (low pH). If the metallic taste is strongest first thing in the morning, run the faucet for 15-30 seconds to flush standing water from the pipes.
Iron taste: Orange or rust-tinted water with a metallic flavor. Common in well water with high iron content and in homes with corroding galvanized or cast iron pipes.
Fix for pipe-related causes: Repiping eliminates the source. For well water with natural iron content: an iron filtration system.
Musty or Earthy Smell
Typically caused by algae blooms or organic matter in the source water. Municipal systems occasionally experience this during seasonal transitions. It’s generally harmless but unpleasant.
If the musty smell is only at one fixture, check the aerator and drain for bacterial growth.
Bleach Smell (Stronger Than Normal Chlorine)
If your water smells strongly of bleach, the municipal system may have recently shocked or flushed the distribution lines with higher-than-normal chlorine levels. This typically resolves within 24-48 hours.
If it persists, contact your water utility. A carbon filter at the point of use provides immediate relief.
Fishy Smell
Can indicate the presence of barium or cadmium in the water — naturally occurring metals that can leach from underground deposits. This is more common in well water.
Fix: Water testing confirms the source. A reverse osmosis system effectively removes these metals at the drinking water tap.
When to Take Action Immediately
- Rotten egg smell from hot AND cold water — test for hydrogen sulfide levels
- Water that looks brown, yellow, or cloudy — indicates sediment, rust, or contamination
- Sudden change in taste or smell — could indicate a water main break, cross-connection, or contamination event
- Well water with any unusual odor — test for bacteria (coliform/E. coli) immediately
Our Approach
We start with water testing to identify exactly what’s in your water. From there, we recommend targeted treatment — not a one-size-fits-all system. A $300 anode rod replacement solves the rotten egg problem from a water heater. A $1,500 whole-home filter handles chlorine taste. The right solution depends on the actual cause.
YOUTUBE EMBED: Got High Water Pressure? This One Valve Fixes It FAST — @YallCallWally
Call Waldrop Plumbing Air Electric at (864) 536-0887 to schedule a water quality assessment.
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