The sump pump does its quiet job in the corner of the basement, and most people only think about it when there is water on the floor. Your mother probably knew the sound it made. You may not. This is for the moment you notice something is off, before the carpet is wet and before you have to make a decision in a hurry.
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What goes wrong first
A sump pump almost never dies with a bang. It usually fails in one of three slow ways. The float, the small arm or ball that tells the pump when to switch on, can get stuck against the side of the pit or caught on a loose cord, so the pump sits silent while the water climbs. The discharge pipe, the length of pipe that carries water out through the wall and into the yard, can get blocked by leaves, mud, or ice during a cold stretch, so the pump runs but the water has nowhere to go. Or the power goes out during the same storm that is filling the pit, and a battery backup, if your house has one, has been sitting unchecked for a long time.
What to do tonight
If it is raining or has just stopped raining, go down and look, but stay out of the water. If the floor is wet near the outlet, or the cord feels warm, do not touch it. Leave it alone and call an electrician. If the area is dry and safe, lift the pit lid and look at the water level. Note how close it sits to the rim.
Then run the test. Pour a bucket of water slowly into the pit and listen. The float should lift, the pump should start, and the water should drop. If the pump does not start, or the water keeps climbing after it runs, you have found the problem.
Next, walk outside and find the end of the discharge pipe. It should point away from the house and be clear. Pull out leaves and mud with a gloved hand or a stick. If the weather has turned cold, look for ice at the outlet.
Finally, put one name on the list of people who check the pit after storms. If nobody else lives in the house with him, ask a neighbor, a relative, or a handyman you trust to be that name.
Signs that show up early
The pump runs longer than it used to, or switches on more often than the weather explains. You hear it running on a dry day. There is a wet ring on the wall of the pit, or a musty smell near the sump. After a storm, the water sits at the rim for longer than it should. A battery backup alarm chirps or the backup light is off. Any one of these is worth a look the same week. None of them means disaster.
When to call someone
Call a plumber if the pump runs nonstop, if the water still rises after your test, or if the discharge pipe is cracked or pulls loose from the wall. Call an electrician for any outlet, cord, or breaker problem, and do not try to fix wiring yourself. Ask the plumber to show you the test on the spot, to explain in plain words what they found, and to tell you what they would check next time, so you know what to watch for.
A good week, for this one, is a dry pit, a clear pipe, and a name on the list for the next storm.