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Plumbing problem
Why does my water smell?
The short answer
EPA treats odor as a useful sign of water quality, with one caveat: water with no odor is not necessarily safe to drink (EPA). The kind of smell points toward different causes, and a simple glass test tells you whether the smell is in the water or coming up from the drain.
First, is it the water or the drain?
Fill a glass at the sink that smells, step away from the sink, and swirl the water a few times. If the water in the glass has no odor, the problem is in the drain, not the water (University of Georgia Extension). If the water itself smells, run the hot and cold taps separately. A smell in hot water only points toward the water heater (Virginia Cooperative Extension).
What official sources say each smell can mean
| Smell | What the sources say it can come from |
|---|---|
| Rotten eggs or sulfur Rotten egg smell → | Hydrogen sulfide from sulfur-reducing bacteria in groundwater, or a reaction with a water heater’s magnesium rod when only the hot water smells (Penn State Extension; Virginia Cooperative Extension). A rotten egg smell in the air is a different matter: see the safety note above. |
| Sewage or something decayed Sewage smell in water → | Georgia’s extension service says a rotten egg, decayed, or sewage-like odor in household water results from bacterial activity, in a drain, a water heater, or a well (University of Georgia Extension). |
| Chlorine or bleach Chlorine smell in water → | Utilities add chlorine or chloramine to kill germs, and CDC says water containing chlorine can taste and smell different (CDC). Georgia’s extension service puts typical free chlorine in public water at 0.2 to 2.0 ppm (University of Georgia Extension). |
| Musty, earthy, grassy, or fishy | Decaying organic matter in a drain, or pollution reaching a well, according to the same UGA guide, which recommends the same glass test to tell the drain from the water (University of Georgia Extension). |
| Gasoline or petroleum | The UGA guide’s instruction is to stop drinking the water and have it tested (University of Georgia Extension). |
What people usually report
A smell that shows up in one room and not another, a smell only in the shower, or a change that started after plumbing work, a vacation, or a switch to a new water source. Where the smell appears, and when, is the most useful thing to tell a utility, a lab, or a plumber.
How to find out
- On public water: read your utility’s Consumer Confidence Report. EPA requires community water systems to send one to customers every year by July 1, and you can look yours up with EPA’s CCR search tool or call the utility (U.S. EPA).
- For a lab test: EPA links each state’s drinking water laboratory certification program, which lists certified labs you can pay to test a sample (U.S. EPA).
- On a private well: EPA and CDC both say to test at least once a year for total coliform bacteria, nitrates, total dissolved solids, and pH, and to test again after any change in taste, odor, or color (U.S. EPA; CDC). EPA does not regulate private wells; your state or local health department can help.
EPA sets secondary standards for taste, odor, and appearance, including a limit for odor, but does not enforce them (U.S. EPA). Your utility’s report shows what it tested for. A certified lab can test a sample from your own tap.
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Try this while you wait: screening tools
A home kit or gauge can tell you whether something is worth a closer look. It is a screening tool only. It does not replace a test from a state-certified laboratory or an inspection by a licensed plumber.
- Home drinking water test kits on Amazon →Covers several common items at once as a first look.
- Hydrogen sulfide water test kits on Amazon →For a sulfur or rotten egg smell from the tap.
- Chlorine test strips on Amazon →Shows roughly how much chlorine is in tap water.
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Local help
Who to contact
If you are on a public water system, your water utility is the first call for anything that affects the water itself. Its phone number is on your bill and in its annual water quality report.
For work on the pipes and fixtures inside your home, hire a licensed plumber and confirm the license before work starts. Our guide to choosing a plumber covers what to ask. License lookups for the areas our city pages cover:
- FL: Florida Department of Business and Professional Regulation (DBPR)
- IA: Iowa Plumbing and Mechanical Systems Board (PMSB), administered by Iowa DIAL
- MO: Kansas City, MO City Planning & Development (plumbing license, city-issued)
- NE: City of Omaha Building and Development Division (plumbing license, city-issued; Nebraska has no statewide plumbing board)
- NV: Nevada State Contractors Board (NSCB), Classification C (plumbing)
- OK: Oklahoma Construction Industries Board (CIB)
- TX: Texas State Board of Plumbing Examiners (TSBPE)
Elsewhere, search your state’s plumbing or contractor licensing board. Some cities issue plumbing licenses themselves.
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Common questions
Water smell questions
Is it okay to drink water that smells weird?
Smell alone does not answer that. EPA notes that odor and taste are useful indicators of water quality, but that odor-free water is not necessarily safe to drink. For a smell like gasoline or petroleum, Georgia’s extension service says to stop drinking the water. For anything else, the utility’s annual water quality report or a test from a state-certified lab is how you find out what is in it.
Why does water smell bad in only one faucet?
A smell at one faucet often comes from that fixture’s drain rather than the water. The check UGA Extension describes: fill a glass at that sink, step away, and swirl it. If the water in the glass has no odor, the problem is in the drain.
Is it normal for water to smell?
Some smells have known everyday sources. CDC says water containing chlorine can taste and smell different from untreated water, and utilities add chlorine or chloramine to kill germs. EPA’s secondary standards list rotten-egg, musty, or chemical smells as signs worth attention. Whether a smell is expected for your water is a question for your utility or a lab test.
Sources and limits
- Fire Department of the City of New York (FDNY), Natural Gas Safety: If you think you smell gas or suspect a gas leak. Checked 2026-10-05.
- California Public Utilities Commission, Gas Safety and Reliability Branch: Emergency Response. Checked 2026-10-05.
- U.S. EPA, Secondary Drinking Water Standards: Guidance for Nuisance Chemicals. Checked 2026-10-05.
- University of Georgia Extension, Your Household Water Quality: Odors in Your Water (C1016). Checked 2026-10-05.
- Penn State Extension, Hydrogen Sulfide (Rotten Egg Odor) in Water Wells. Checked 2026-10-05.
- Virginia Cooperative Extension, Virginia Household Water Quality Program: Sulfate and Hydrogen Sulfide in Household Water. Checked 2026-10-05.
- CDC, About Water Disinfection with Chlorine and Chloramine. Checked 2026-10-05.
- U.S. EPA, Consumer Confidence Report (CCR) information for consumers. Checked 2026-10-05.
- U.S. EPA, Find your local Consumer Confidence Report (search tool). Checked 2026-10-05.
- U.S. EPA, Certification programs and certified laboratories for drinking water, by state. Checked 2026-10-05.
- U.S. EPA, Private Drinking Water Wells: Protect Your Home's Water. Checked 2026-10-05.
- CDC, Guidelines for Testing Well Water. Checked 2026-10-05.
This page summarizes guidance published by the agencies and organizations listed above. It is general information, not a diagnosis of your home or your water. Guidance can change, so check the linked source, your water utility, or your local health department before acting on it. PlumbingRepairCost is not affiliated with any agency named here. Spotted an error? Email hello@plumbingrepaircost.com and we will check it against the source.