Storm & Flood Water Cleanup
Storm water is not the same thing as a burst pipe. A pipe leaks clean water from a known source. Storm water arrives from the outside, carries dirt, fertilizer, oil and sewage with it, and keeps arriving until the rain stops and the ground drains. That difference shapes the whole cleanup.
Where storm water gets in
| Entry path | What it looks like | Common cause |
|---|---|---|
| Window wells and basement windows | Water pooled at the sill, running down the wall | Wells that fill faster than they drain, cracked or low windows |
| Door thresholds and garage | Water pushing under the door | Ground grading that slopes toward the house |
| Foundation wall cracks and joints | Wet streaks, or a line of damp along the floor | Saturated soil pressing against the wall |
| Floor drains and toilets | Water or sewage coming up from below | Overloaded sewer lines in a long storm |
| Roof, flashing and chimneys | Stains on the ceiling, wet attic insulation | Wind-driven rain past damaged shingles or flashing |
| Rising creek or river water | Water across the yard and into the lowest level | Overbank flooding, rare but severe |
What kind of water is it?
Rain that came through a roof is usually Category 2. Surface runoff and creek water, once it touches the ground, is Category 3 under the industry standard, since it picks up whatever is outside. That matters. It means carpet and pad that were soaked in runoff are removed, drywall is cut out above the line, and surfaces are cleaned and sanitized rather than just dried.
A note on the Patuxent and flood-prone ground
Laurel's mill history includes a telling detail: the Laurel Historical Society says the Patuxent mill added steam power as a backup because of low water or high water. The river has long been unpredictable. County planning documents for Prince George's County treat the Patuxent River corridor as a regulated environmental area, with development in the 100-year floodplain restricted. Howard County states that it does not allow building in the floodplain. That limits new construction on the worst ground but says little about older houses nearby.
If you live close to the river or a creek, check your flood zone with the county or on FEMA's map service. Ordinary homeowners insurance generally does not cover flood damage, and separate flood insurance often has a waiting period before it starts.
Storm water in the house?
Stay out of it if you can. Call with the depth and where it entered.
Call (301) 786-0888How the cleanup runs
Safety first
Water near outlets, a furnace or a water heater is a hazard. The area is made safe and, if needed, power is cut before anyone steps in.
Pump and extract
Standing water goes out with pumps and extractors, and the discharge is directed away from the foundation.
Remove contaminated materials
Carpet, pad, insulation and low drywall that sat in runoff are cut out. Contents that cannot be washed and sanitized are discarded.
Clean and sanitize
Hard surfaces and framing are scrubbed and treated with an antimicrobial before they are dried.
Dry and check
The machines run until readings match dry reference points. A damp basement in a humid week takes longer.
Do this while you wait
- Stay out of floodwater. It can be contaminated and can carry electricity if anything live is submerged.
- Do not use appliances that stood in water until they have been checked.
- Take photos and video of the water line and the damage before anything is moved.
- Pick up items that are not touching water yet.
- Call your insurer, and if you have flood insurance, your flood insurer separately.
What not to do after a flood
Do not run the furnace, the air conditioner or the ductwork until it has been checked, since flood water in the system spreads contamination through the house. Do not turn on electronics that were wet. Do not use a household vacuum on water or mud. Do not let wet items pile up in the house, because they hold moisture and smell. And do not wait for the weather to clear completely before calling, since extraction can start while the rain is still falling outside, once it is safe to enter.
Dry surfaces, wet structure
The water is gone, but the building is still wet. Look for white mineral deposits on block or concrete, a musty smell that does not go away, swollen baseboards and doors, and wet insulation in the rim joist area. Mud and silt left behind carry bacteria and can hide moisture. A basement that looks fine on day two and smells bad on day four is a basement where something stayed wet.
Storm and flood questions
Is rainwater that came through the roof contaminated?
It is typically treated as gray water, since it picks up dust and insulation on the way down. Wet insulation is removed, and the area is dried promptly.
How long before mold starts after a storm?
Growth can begin in 24 to 48 hours on materials that stay wet. A flooded basement in a humid week is a good setup for it, so speed matters.
Does the sump pump help?
Yes, when it has power and the discharge line is clear. Many fail during storms because the power goes out, and a battery backup helps.
Is flood damage covered by my homeowners policy?
Usually not. Flood is generally a separate policy. Wind-driven rain through a damaged roof is treated differently. Check with your insurer.
What about the mud?
Mud left by flood water is contaminated. It is shoveled out, the surface is washed and sanitized, and the area is dried.
After the water is out
- Basement Flood Cleanup Dealing with a flooded basement.
- Sewage Backup Cleanup When the storm overloaded the drains.
- Structural Drying & Dehumidification Drying after the water is out.