What to Do When Your Basement Floods

Standing water + electricity = life-threatening danger. If the water is above any electrical outlets (they're usually 12-18 inches from the floor), do NOT enter the basement until the power is shut off at the breaker panel upstairs.

If the breaker panel is IN the basement and submerged or near the water line, call your utility company to shut off power from outside. Do not attempt to reach a submerged breaker panel.

If you smell gas (rotten egg odor), leave the house immediately and call your gas company from outside. Don't flip switches, light matches, or use your phone inside the house.

Once power is off and there's no gas smell, wear rubber boots and gloves before entering. If the water is from a sewer backup, add a respirator mask... sewage contains bacteria, viruses, and parasites.

Identify where the water is coming from and stop it if possible:

Burst pipe: shut off the main water valve (usually near the water meter, in the basement, or where the water line enters the house). Every household member should know where this valve is.

Sewer backup: you can't stop this from inside the house. The sewer line is blocked or the municipal system is overwhelmed. Don't use any water fixtures (toilets, sinks, showers) until the line is cleared.

Ground water seepage: this is caused by heavy rain, high water table, or poor drainage. You can't stop it, but you can manage it with a sump pump. If your sump pump isn't running, check that it's plugged in and the float switch isn't stuck.

Window well or foundation crack: if water is pouring in through a specific opening, try to divert it with sandbags, towels, or plastic sheeting temporarily while you deal with the water that's already inside.

The faster you remove water, the less damage it causes. Mold starts growing within 24-48 hours in wet conditions.

Sump pump: if yours is working, let it do its job. If it can't keep up, rent or buy a utility pump ($100-$200 at any hardware store) and run a discharge hose out a window or to a floor drain.

Wet/dry vacuum: for smaller floods (under 2 inches), a shop vac removes water effectively. You'll make many trips to empty it.

Professional water extraction: for significant flooding (6+ inches or sewage), call a water damage restoration company (ServPro, ServiceMaster, or local companies). They have truck-mounted extraction equipment that removes water much faster than anything you can rent. Cost: $1,000-$5,000 depending on severity. Call immediately... during storms, they book up fast.

After the standing water is out, aggressive drying is critical to prevent mold.

Set up every fan you own pointing at wet surfaces. Open windows if the outside air is drier than inside (not during active rain). Run a dehumidifier... a 50-70 pint model ($200-$400) is ideal. The goal is to get humidity below 50% within 48 hours.

Pull wet carpet and pad. Carpet pad is like a sponge... it holds water and breeds mold. It almost always needs to be discarded. The carpet itself might be salvageable if it's dried quickly and wasn't contaminated by sewage.

Move wet furniture and belongings to a dry area. Separate items into "saveable" and "discard" piles. Take photos of everything before discarding for insurance documentation.

Open closets, drawers, and cabinet doors to allow air circulation inside enclosed spaces.

Before you clean up too much, document everything for your insurance claim:

Take photos and video of: the water level (mark it on the wall with tape), all damaged areas, all damaged belongings, the source of the water if visible, and the overall scope of the flooding.

Make a list of damaged items with descriptions and approximate values. Don't throw anything away until the adjuster has seen it or you've documented it thoroughly.

Important coverage distinctions: - Burst pipe flooding: typically covered by homeowners insurance - Sewer backup: only covered if you have the sewer backup endorsement ($40-$70/year) - Ground water/flooding from outside: NOT covered by homeowners insurance... requires separate flood insurance - Sump pump failure during a storm: may be covered under sewer backup endorsement depending on your policy

Call your insurance company as soon as possible to open the claim. Don't wait until cleanup is done.

Once the space is dry, clean and disinfect all surfaces that were touched by flood water.

For clean water (burst pipe): soap and water, followed by a disinfectant (bleach solution: 1 cup bleach per gallon of water). Wipe down walls, floors, and any surfaces the water contacted.

For sewage backup: this is a biohazard. Professional cleanup is strongly recommended. If you must DIY: wear full protective gear (rubber boots, gloves, N95 respirator, eye protection). Discard anything porous that contacted sewage (carpet, padding, upholstered furniture, mattresses, cardboard). Hard surfaces can be cleaned with bleach solution.

Drywall that was submerged: cut it out 12 inches above the water line. Drywall wicks moisture upward, so the damage extends above the visible water mark. The wall cavity behind it needs to dry completely before new drywall goes up... this takes 1-2 weeks with fans and dehumidifiers.

Burst pipes: insulate pipes in unheated areas, keep heat at 55°F+ when away in winter, know where your shut-off valve is.

Sewer backup: install a backwater valve ($300-$1,000 installed) on the main sewer line. This prevents sewage from flowing backward into your home during municipal sewer overloads.

Ground water: install a sump pump if you don't have one ($500-$1,500 installed). If you have one, add a battery backup ($200-$400) so it works during power outages... which is exactly when you need it most (storms cause both flooding and power loss).

Poor drainage: grade the soil away from the foundation (6 inches of slope over the first 10 feet), extend downspouts 4-6 feet from the house, and keep gutters clean. Most basement water problems are drainage problems.

Add the sewer backup endorsement to your homeowners insurance ($40-$70/year) if you don't have it. This single endorsement covers one of the most common and most expensive basement disasters.