Skunk smell in your house: rule out gas, then find the skunk
Last reviewed · Not medical advice
The odorant added to natural gas and propane smells skunky to many people, so treat a skunk smell indoors as possible gas until you've ruled that out. If it's strongest near a gas appliance or the meter, or it showed up suddenly and doesn't fade, leave and call the gas utility from outside. If it's strongest outdoors, near the foundation or crawlspace vents, and worse at night, it's very likely a real skunk that sprayed under or near the house. A skunk smell that hangs around one drain or an unused bathroom is often sewer gas from a dried-out trap.
Most likely causes
Ranked for this situation. Open any cause for checks and fixes.
- 1
A skunk sprayed near or under the house
most commonMost indoor skunk smell comes from a skunk that sprayed under a deck, porch, or crawlspace, or right outside a window or vent.
Points to this:- Smell strongest outside or at night, when skunks are active
- Digging near the foundation, deck, or shed; a pet that came in smelling
Check it, fix it, who to call
Safe checks- Walk the outside at the foundation, deck, and crawlspace vents and check where it's strongest.
- Make sure it isn't gas first — if it's strongest inside near a gas appliance, treat it as gas.
Fix- Ventilate; wash fabrics that picked it up.
- Have wildlife control humanely remove a resident skunk and seal the access point.
DIY stops here: Don't trap or corner a skunk yourself.
Who fixes it: Wildlife control
More on this - 2
Natural gas leak
commonAct nowListed high because the consequences are serious, not because it's usual. Mercaptan is often described as skunky.
Points to this:- Strongest near the stove, furnace, water heater, dryer, or gas meter
- Hissing or whistling near a line or appliance
- Smell came on suddenly and doesn't fade with ventilation
Check it, fix it, who to call
Safe checks- Do not hunt for the leak. If the smell is strong or you're unsure, leave and call from outside.
- A faint smell right at the stove: check whether a burner knob was left on without lighting. If so, turn it off and air the room — and leave and call if the smell doesn't clear quickly.
Fix- The utility (natural gas) or supplier (propane) finds and isolates the leak.
- A licensed plumber or gas fitter repairs the line or appliance connection.
DIY stops here: There is no DIY step beyond leaving and calling. Don't use soapy-water tests indoors while the smell is present.
Who fixes it: Your gas utility's emergency line
More on this - 3
Dried-out drain trap
commonSewer gas from an unused drain can read as skunk to some noses, especially in a basement or guest bath.
Points to this:- Smell is near a guest bath, basement floor drain, unused shower, or utility sink
- Started after a trip, or in a room nobody uses
- Goes away after running water
Check it, fix it, who to call
Safe checks- Run water in every sink, tub, and shower for 30 seconds, and pour a bucket of water into floor drains.
- Flush toilets that rarely get used.
- Wait a few hours. If the smell is gone, it was a dry trap.
Fix- Run water in rarely used fixtures every couple of weeks.
- For floor drains that dry out constantly, a plumber can fit a trap primer or a trap-seal insert.
DIY stops here: If refilling the traps doesn't stop it within a day, the problem is past the trap — call a plumber.
Who fixes it: Plumber
More on this - 4
Propane leak
less commonAct nowOnly if the home or an appliance runs on propane.
Points to this:- Home or appliance runs on a propane tank
- Smell strongest low down or near the tank, regulator, or an appliance
Check it, fix it, who to call
Safe checks- Leave, then close the tank's main valve (clockwise) only if you can reach it safely.
- Call your propane supplier or 911 from a safe distance.
Fix- Your supplier or a qualified technician leak-tests and repairs the system before relighting.
DIY stops here: Beyond closing the tank valve on the way out, nothing — don't relight pilots yourself after a leak.
Who fixes it: Your propane supplier
More on this - 5
Gas smell drifting in from outside
less commonSame dayA skunky smell that's strongest at the meter or the street is a utility call, not a wildlife call.
Points to this:- Smell is stronger outdoors or near the meter than inside
- Comes and goes with the wind, or started when nearby digging began
Check it, fix it, who to call
Safe checks- Note where outside it is strongest, then call the gas utility — outdoor leaks are their job too.
Fix- The utility locates and repairs outdoor and street leaks.
DIY stops here: Report it; don't dig, touch the meter, or probe around lines.
Who fixes it: Your gas utility's emergency line
More on this - 6
Blocked or damaged plumbing vent
rareWithin daysIf drains also gurgle.
Points to this:- Drains gurgle or bubble, especially when a toilet flushes
- Water levels in toilet bowls drop or fluctuate
- Smell in several rooms, worse on windy days
Check it, fix it, who to call
Safe checks- Flush a toilet and listen at nearby sinks and tubs for gurgling.
- Look at the roof vent from the ground with binoculars for a nest or debris (don't climb onto the roof).
Fix- A plumber clears the vent stack or repairs a cracked or disconnected vent pipe.
DIY stops here: Roof work and snaking vents are a job for a plumber.
Who fixes it: Plumber
More on this
How we rank causes: by how often each one explains this smell in ordinary homes, according to plumbing, HVAC, electrical, and building-science guidance, adjusted for the context on this page. The labels are judgments, not measured statistics. Anything dangerous that can't be ruled out (gas, fire, electrical) is covered in the safety box at the top of the page, whatever its rank.
Which one is it?
| Clue | Points to | Do this |
|---|---|---|
| Strongest near the stove, furnace, water heater, or meter | Gas leak | Leave and call the utility |
| Hissing near a gas line or appliance | Gas leak | Leave and call the utility |
| Strongest outside, at night, near deck or crawlspace vents | Real skunk | Wildlife control |
| Pet came in smelling; scratching or digging at the foundation | Real skunk | Wash the pet, then check under the house |
| Only near one drain or an unused bathroom | Dry drain trap | Run water in the drain |
| Started with nearby digging or street work | Outdoor gas | Call the utility |
Narrow it down
Answer in order. Stop at the first yes.
- 1Is it strongest near a gas appliance, gas line, or meter — or did it come on suddenly and strongly indoors?Yes → Treat it as gas: leave and call from outside. Go thereNo → Keep going.
- 2Is it stronger outside than inside, especially at night or near the foundation, deck, or crawlspace vents?Yes → A skunk is likely living or spraying near the house. Ventilate and call wildlife control.No → Keep going.
- 3Is it concentrated at one drain, a floor drain, or a rarely used bathroom?Yes → Refill the trap with water and see if it clears within a few hours. Go thereNo → Keep going.
- 4Did the gas utility already check and find nothing?Yes → Work through the other sulfur-type sources. Go there
Safe checks you can do yourself
In the order that finds the source fastest.
- 1
Decide gas or not, from where it's strongest
Without flipping switches, note whether the smell is stronger at the kitchen, utility room, or meter, or stronger at windows, doors, and floor vents on one side of the house. If you're unsure, don't experiment — leave and call the utility.
- 2
Walk the outside perimeter
In daylight, walk the foundation, the deck and porch edges, the crawlspace vents, and around any shed. Look for fresh digging, a hole under a slab or step, or a spot where the smell is overwhelming.
- 3
Check the pets
A dog or cat that got sprayed carries the smell through the house on everything it touches. Smell the pet's head and neck first — that's where spray usually lands.
- 4
Run water in every drain
Run sinks, tubs, and showers for 30 seconds each, and pour a bucket of water into basement floor drains. A smell that disappears within a few hours was a dry trap.
Getting skunk smell out of the house
Skunk spray is oily and clings to fabric, so the plan is to clear the air and then wash what absorbed it.
First, open windows on opposite sides of the house and run box fans pointing outward to push air through. If the smell is coming in through crawlspace or foundation vents, run the HVAC fan only after the outside source is gone — otherwise you're pulling more of it in. Wash curtains, bedding, throws, and clothes that were in the affected rooms. Wipe hard surfaces near where it entered. Replace the HVAC filter once the source is gone, since it holds the smell.
Masking sprays don't work well against skunk. A smell that lingers in a room after a week usually means a fabric or carpet in there is still holding it.
Why it smells like skunk at night
Skunks are mostly active from dusk to dawn, so a smell that shows up in the evening and fades by midday fits a skunk that's living nearby or passing through. A closed-up house at night can also concentrate a smell that slipped in earlier. A smell that's just as strong at noon, and strongest indoors, points away from wildlife and back toward gas or a drain.
When DIY stops
- Any chance it's gas: leaving and calling is the only DIY step.
- A skunk living under the deck, porch, shed, or in the crawlspace — don't trap or corner it yourself.
- Smell that persists after refilling drain traps — a vent or sewer line may be involved.
Who to call
- Your gas utility's emergency line
Any doubt at all that it's gas. Call from outside.
Checks for natural gas leaks. Call its emergency number, not the billing line.
- Your propane supplier
Your home or appliances run on propane.
Checks propane tanks, lines, and appliances for leaks.
- Wildlife control
A skunk is under the house, deck, or shed. They remove it and seal the entry.
Removes skunks, raccoons, and other animals under decks, sheds, and crawlspaces.
- Plumber
The smell comes from drains and refilling the traps didn't fix it.
Drains, traps, toilets, vents, water heaters, and leaking supply lines.
Answer a few questions about where and when you smell it. You'll get the causes ranked for your situation.
Frequently asked questions
Can a gas leak smell like skunk?
Yes. Natural gas and propane are given an odorant so leaks are noticeable, and many people describe it as skunky rather than rotten eggs. If you're not sure, assume gas, leave, and call from outside.
Why does my house smell like skunk but there's no skunk?
A skunk may have sprayed under the house or nearby without being seen, or the smell is gas or sewer gas from a dry drain trap. Where it's strongest tells you which: outside and at night suggests a skunk, near gas appliances suggests gas, at a drain suggests the trap.
How long does skunk smell last in a house?
It depends on how close the spray was and what absorbed it. Air that's ventilated clears fastest; fabrics and carpets hold it until they're washed or cleaned. If the smell keeps coming back, the skunk is probably still nearby.
Should I run the AC or furnace fan to clear it?
Only once the source outside is gone and you've ruled out gas. Running the fan while a skunk is under the house can pull the smell in through gaps and ducts, and the filter will hold onto it — change it afterward.
Related smells
Sources
- Using Natural Gas Safely — American Gas Association
- Safety Guide for Propane Users — Propane Education & Research Council
- Carbon Monoxide Information Center — U.S. CPSC