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Not until you know the water is neither energised nor contaminated. Those are the two questions, and until both have answers the correct place to stand is the top of the stairs.
The electrical question
A basement concentrates more electrical equipment at floor level than any other room in a house. The panel is usually there. So are the furnace, the water heater, the washer and dryer, the sump pump, a freezer, and whatever is plugged in along the walls.
Standing water in contact with an energised circuit makes the entire floor a conductor. You will not get a warning, and the depth does not need to be dramatic — a film of water on a concrete slab is enough.
Three things people get wrong here. Power being out does not mean power is off, because utility supply returns without notice. A generator connected upstream can backfeed circuits you believed were dead. And a tripped breaker protects that circuit only, not the others.
If the panel sits inside the wet area, or reaching it means crossing water, do not attempt the shutoff yourself. That is a call to the utility or an electrician, and it is a routine request rather than an imposition.
The contamination question
Where the water came from decides what protective equipment entry requires.
- A burst supply line or water heater — clean water at the moment of release. Lowest risk, though it degrades over hours.
- Groundwater through a wall or the cove joint — carries soil and whatever is in it. Moderate risk.
- A floor drain, toilet, or sewer line — contaminated. Entry requires protective equipment, not boots.
- Outdoor floodwater — treated as contaminated regardless of appearance.
If you cannot identify the source with confidence, assume the worse category until someone can. Clear water tells you very little; sewage backup through a floor drain often looks clean.
Other hazards that get overlooked
Gas appliances. A furnace or water heater that has been partly submerged should be inspected before use. Controls and gas valves are not designed to be wet.
Stored chemicals. Paint, solvents, pool chemicals, and lawn treatments are commonly stored on basement floors and will have released into the water.
Structural and footing risk. Rare, but if water has undermined material around footings or a wall shows new bowing or cracking, that needs an assessment before anyone is inside.
Air quality. A basement that has been wet and closed up holds high humidity and, in contaminated situations, aerosolised material.
If entry is safe
Wear boots and gloves at minimum. Keep one hand free. Take a light rather than relying on basement fixtures. Tell someone upstairs you are going down. Do not go alone if the water is above ankle depth.
Go down to look and photograph, not to start work. The assessment takes two minutes and shapes everything after it.
When the answer is simply no
Stay upstairs and call if water is still rising, if it is at or near the panel, if the furnace or water heater is partly submerged, if the source is a drain or sewer, if you smell gas, or if anything about the structure looks different than it did.
Nothing downstairs is worth being wrong about. Photographs from the stairs satisfy an insurer, and a professional entering with proper equipment loses you nothing but a short wait.
Related pages
For the full first-hour sequence, see what to do after a basement floods. If power is out, see flooding with the power out. For contaminated water, see sewage and contamination.