How long does it take for mold to grow after a pipe bursts?

Under warm, humid conditions — common in a heated home in winter — mold can begin colonizing wet drywall and wood framing within 24 to 48 hours. Cooler temperatures slow that timeline, but they don't stop it. The safest assumption is that any material that stayed wet overnight needs to be assessed before it's closed back up.

Will my homeowner's insurance cover a burst pipe?

Most standard homeowner's policies cover sudden and accidental water damage from a burst pipe — but they typically exclude damage from a slow leak that went unaddressed over time. The distinction matters, so document when you discovered the problem and what caused the pipe to fail. Policies vary, so read your declarations page and contact your agent early in the process.

How do I know if water got into the walls after a pipe burst?

The most reliable way is a moisture meter — a probe-type meter inserted near baseboards will show elevated readings inside wall cavities even when the surface feels dry to the touch. Visual signs include soft or bubbling drywall, paint beginning to peel or blister, and baseboards pulling away from the wall. A musty odor that develops in the days after a leak is another strong indicator that moisture is trapped somewhere you can't see.

Can I use a regular dehumidifier to dry out my house after a burst pipe?

A household dehumidifier helps with ambient humidity in the air but isn't designed to pull moisture out of structural materials like subfloor assemblies, wall framing, or concrete. Commercial drying equipment used by restoration professionals moves significantly more air volume and removes far more moisture per hour. For anything beyond a small, contained spill on a hard surface, household equipment typically isn't adequate to dry the structure to safe moisture levels within the window that prevents mold growth.

Burst Pipe Checklist: Step-by-Step Response

When a pipe bursts, the first 10 minutes matter more than anything that follows. Shut off the main water supply valve — usually near the water meter, in a basement, crawl space, or utility closet — then cut power to any rooms where water is pooling near outlets or panels. After that, you have time to think. This checklist walks you through every step in order: what to do right now, what to skip, how to document the damage, and when the situation is beyond a mop and a fan.

Step 1 — Stop the Water and the Electricity

Before you grab towels or move furniture, get the water off.

Locate and close the main shutoff valve. Turn it clockwise until it stops. If you’ve never found yours, now is a bad time to learn — take 10 minutes this week to locate it before winter.
Open a cold-water faucet on the lowest floor. This bleeds residual pressure from the lines and slows the drip from the break.
Assess electrical risk. If water has reached a room with floor outlets, a finished basement panel, or a kitchen — don’t walk in. Flip the breaker for that zone at the main panel, or call your utility provider if you’re unsure which circuit controls the area.
Call a licensed plumber. The burst section needs to be cut out and replaced before water can be restored. This is not a pipe-tape fix.

In Sioux Falls, pipes most commonly burst during the hard freeze weeks in January and February, when overnight lows drop into the negative teens and homes with poorly insulated exterior walls or crawl spaces see pipe temperatures fall below 20°F — the threshold where copper and PVC become vulnerable.

Step 2 — Document Everything Before You Touch It

Insurance adjusters work from evidence. The more you capture before cleanup begins, the smoother the claim process.

Photograph the burst pipe itself — the location, the split or crack, any visible corrosion or joint failure.
Video the affected rooms in a slow sweep, narrating what you see. “Water is standing about half an inch across the entire basement floor” is more useful than a blurry photo.
Photograph the water line on walls. If the water rose and receded, the stain marks the high point — adjusters use this to calculate volume and coverage.
Note the time. Write down when you discovered the leak, when you shut off the water, and when you called for help. This timeline matters for coverage disputes.
Don’t throw away damaged materials yet. Wet carpet, warped baseboards, and saturated insulation are evidence until your adjuster or restoration team documents them.

Step 3 — Begin Safe Water Removal (What You Can Do Yourself)

Once the water is off and the space is electrically safe, you can start reducing the standing water. The goal is to limit how far moisture migrates — water travels fast through subfloor seams, under baseboards, and into wall cavities.

Use a wet/dry shop vac to pull standing water off hard floors. A standard 16-gallon vac can remove several gallons per pass.
Remove soaked rugs and area rugs. Lay them flat in a dry area or outside. Wall-to-wall carpet is a different story — it often needs to come up, and the pad underneath almost always does.
Move furniture off wet flooring. Wood and metal furniture legs wick moisture into flooring and leave stains. Place aluminum foil squares under legs if you can’t move a piece entirely.
Open windows if outdoor humidity is lower than indoor humidity. In summer, outdoor air in South Dakota can be just as humid — check before you ventilate. In winter, cold dry air helps.
Run fans across wet surfaces. Box fans pointed at wet flooring move surface moisture, but they don’t pull moisture from inside walls or under subfloors.

What fans and a shop vac cannot do: They cannot dry wall cavities, subfloor assemblies, or structural framing. If water was standing for more than an hour, it has already moved into places you can’t see.

What NOT to Do After a Pipe Bursts

Some common instincts make the situation worse.

Don’t use a standard household vacuum. It isn’t designed for water and creates an electrocution risk.
Don’t crank the heat and close the windows. High heat without airflow raises indoor humidity and accelerates mold colonization — mold can begin developing on wet drywall in as little as 24 to 48 hours under warm, still conditions.
Don’t assume the floor is dry because the surface feels dry. Engineered hardwood and laminate can feel dry on top while the core and subfloor hold significant moisture. Moisture meters tell the real story.
Don’t wait on the drywall. Wet drywall loses structural integrity quickly and is one of the most efficient surfaces for mold growth. If it’s saturated, it typically needs to come out — the longer it stays, the more framing behind it is affected.
Don’t skip the documentation step to start cleaning faster. Thirty minutes of photography now prevents weeks of disputes later.

When to Call a Water Damage Restoration Professional

Some burst pipe situations are manageable with a plumber and a weekend of work. Many are not. Call a professional restoration team when:

Water was running for more than 30–60 minutes before you discovered it. Volume and time determine how deep moisture penetrates.
The affected area is more than one room or involves a finished basement.
Water reached flooring over a crawl space or slab. Moisture under a slab can stay trapped for weeks.
You see or smell anything that suggests mold — a musty, earthy odor, dark spotting on drywall or framing, or fuzzy growth on baseboards.
The pipe burst inside a wall cavity. If the leak is behind drywall, you’ll often see it first as a soft or bubbling section of wall, a stain spreading from a baseboard, or paint beginning to peel. By the time it’s visible, the framing inside is already wet.
You’re filing an insurance claim. Professional documentation, moisture mapping, and drying logs support your claim and protect you if coverage is disputed later.

Crew Restoration & Construction handles water damage restoration and appliance leak cleanup in Sioux Falls and the surrounding area. If the scope of what you’re looking at feels bigger than a shop vac and a few fans, a call to (605) 965-2727 gets you an honest assessment of what you’re dealing with.

The Longer Recovery: What Happens After the Water Is Gone

Drying a structure properly takes longer than most homeowners expect. Here’s what a professional drying process typically involves:

Moisture mapping. Technicians use thermal imaging cameras and pin-type moisture meters to trace exactly where water traveled — often well beyond the visible damage.
Controlled demolition. Saturated drywall, insulation, and flooring that can’t be dried in place are removed to expose framing and allow airflow.
Industrial drying equipment. Commercial dehumidifiers and air movers run continuously — often for 3 to 5 days — pulling moisture from structural materials. This is categorically different from household fans.
Daily moisture readings. Technicians check readings each day and adjust equipment placement until materials reach target drywall moisture levels (typically below 16% for wood framing).
Clearance documentation. A written drying log confirms the structure met drying goals — important for insurance and for your own peace of mind before reconstruction begins.

Rushing reconstruction before the structure is genuinely dry is one of the most common — and costly — mistakes after a burst pipe. Flooring installed over a wet subfloor will buckle. Drywall installed over damp framing creates ideal mold conditions inside the wall cavity, invisible until the problem is severe.

If you’ve worked through this checklist and the situation is under control, bookmark it for a neighbor or share it — burst pipes in South Dakota winters are common enough that someone you know will need it. If you’re still in the middle of it and the scope feels unmanageable, Crew Restoration & Construction is reachable at (605) 965-2727.