If you're reading this with water in your basement — or water that just got pumped out — take a breath. The next few days matter, but you have time to do this right.
Worried about mold? Here's the short version: mold can start growing on wet drywall, framing, and carpet pad within 24-48 hours of water exposure- which we can easily get rid of in 1 day. Drying out the structure helps, but it doesn't always prevent mold from establishing — especially with sewer backup water. If you want a post-flood mold inspection (or just a second opinion after the restoration crew leaves), that's what we do. Call Pure Maintenance Wisconsin: 608-893-6620. Otherwise, the rest of this guide walks through the full timeline.
We're a Wisconsin mold remediation company. We're not the people you call to extract water or run dehumidifiers. But because we come in after the restoration crews leave, we see exactly what gets done well and what gets missed. This guide is what we tell our friends, family, and neighbors when their basement floods.
Step 1: Right now (first 24 hours)
Stop the water if you can. If it's coming from a burst pipe or appliance, shut off your water main. If it's groundwater, sewer backup, or surface flooding from the storm, you can't stop the source — skip to the next step.
Stay out of standing water if there's any chance electricity is live. Shut off power to the basement at the breaker before going in.
Document everything. Photos and video of the water level, damaged items, and the source. Your insurance company will want this. Do it before you start moving anything.
Call your insurance company before things dry. Standard homeowners policies do not cover flooding from groundwater or sewer backup unless you have a separate flood insurance policy or a sewer backup rider. Call anyway — they'll tell you what's covered and walk you through next steps.
Call a water damage restoration company. This is the urgent call. They have industrial pumps, water extractors, and commercial dehumidifiers — equipment most homeowners don't own. The first 24-48 hours are critical for preventing structural damage and reducing (not eliminating) mold risk.
A few reputable Wisconsin restoration companies that handle emergency water extraction:
- ServiceMaster Restoration — multiple Wisconsin locations, ServiceMaster Baraboo is highly recommended
- ServPro — multiple Wisconsin locations
- Paul Davis Restoration — Madison and Milwaukee
- Rainbow Restoration — Wisconsin coverage
We don't have a financial relationship with any of these companies. They're listed because they're established, available 24/7, and equipped for the work that needs to happen in the first 48 hours.
Step 2: This week (drying out)
Once standing water is removed, the focus shifts to drying the structure. Your restoration company will typically:
- Set up commercial dehumidifiers and air movers
- Cut wet drywall (usually 12-24 inches above the waterline)
- Remove saturated insulation
- Pull up wet carpet and pad — these are almost never salvageable
- Monitor moisture levels in framing, subfloor, and remaining drywall over several days
What you can do:
- Don't run ceiling fans or box fans before the pros arrive — they spread mold spores
- Don't turn on HVAC if any part of it got wet — call a pro to inspect first
- Get porous items (cardboard boxes, paper, upholstered furniture, mattresses) that touched flood water out of the house
- Keep windows open if outside humidity is lower than inside
Things that are often missed
Even though the wall might not look wet on the outside, as you have a fan on it, any wall board exposed to water will have water + mold growing behind. Be sure your restoration company removes any wall board and insulation that got wet or is currently wet. Make sure they measure with a moisture meter and show you.
A note on sewer backup specifically: Milwaukee saw widespread sewer overflows during the April 2026 storms. Sewer water is Category 3 — the most contaminated category. It carries bacteria, biological waste, and organic load that gets absorbed into porous materials. Drying alone does not address contamination. If your basement got sewer water (not just rainwater), tell your restoration company explicitly so they handle it as Category 3.
Step 3: Weeks 2 through 6 (the mold question)
This is where most homeowners get blindsided. The restoration crew packs up, the basement looks dry, and everyone moves on. Then three to six weeks later, someone in the family develops symptoms that don't make sense.
Mold doesn't always show itself visually. Spores released during the wet period get distributed through the air and HVAC system. Wall cavities can stay damp longer than meters detect. Sewer contamination leaves biological residue even after drying.
Watch for these signs in the weeks after a flood:
- New or worsening sinus congestion, headaches, coughing, insomnia, brain fog, fatigue, skin rashes/itching, or other common mold symptoms
- Asthma flares in someone who normally has it under control
- A musty smell that won't go away even though everything looks dry
- Visible discoloration on drywall, baseboards, or framing
If any of these show up, that's the signal to get a mold inspection. Catching it at six weeks is much easier than catching it at six months.
Step 4: When to call us
We're Pure Maintenance Wisconsin, and we handle the step that comes after drying — inspection to confirm whether mold established, and whole-home vapor remediation if it did.
We use patented vapor peracetic acid (PAA) technology that fills the full air volume of your home and reaches spaces traditional remediation has to open up with demolition. Most jobs complete in 1-2 days with minimal demo, and every whole-home remediation includes a transferable 1-year air quality warranty.
You don't need to call us right now. Call us if:
- Symptoms appear in the weeks after the flood
- A musty smell persists after drying is complete
- You're selling the home and want documented air quality
- Someone in the household is immunocompromised and you want an all-clear
- Your restoration company said everything's fine but something feels off
Service area: Madison, Milwaukee, Middleton, Fitchburg, Monona, Waukesha, Brookfield, Elm Grove, Oconomowoc, Portage, and throughout southern and central Wisconsin.
Phone: 608-893-6620
A final word. The Wisconsin homeowners who come through this best are the ones who do each step in order, don't panic, and don't let anyone rush them through decisions. Document everything, ask questions, and don't assume "dry" means "safe." We're available if you have questions even if you never end up needing our services. That's what neighbors do.
Stop Suffering With Mold. Get In Touch.
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