Short answer
A sump pump that cycles on and off for weeks in an Anderson spring is often doing its job: the soil survey estimates a shallow seasonal water table under much of the city, and the pit refills as fast as it empties. A pump that runs without ever stopping, runs in a dry summer, or short-cycles every few seconds usually has a switch, check valve or discharge problem.
Do this first Watch one cycle. Does the pump empty the pit and stop, then start again as water returns? Then it’s working, and in spring that may be normal. If it never stops, or clicks on and off every few seconds, unplug it briefly and check the float and the check valve, following sump pump repair.
Normal for Anderson, or a problem?
| What you see | Likely meaning |
|---|---|
| Cycles regularly for weeks in late winter and spring | The water table is high. Normal on wet till. |
| Runs nonstop and the pit never drops | Pump too small, intake clogged, or discharge blocked or frozen |
| Turns on and off every few seconds | Check valve leaking back, or float set too tight |
| Runs often in a dry summer | Stuck switch, discharge water returning, or a plumbing leak |
| Runs right after it rains and then stops | Normal response to storm water |
Why spring is busy here
The soil survey estimates a seasonal water table within about a foot of the surface under 56% of sampled Anderson land (USDA NRCS). In late winter and spring, groundwater fills the drain tile and the pit continuously. A pump running dozens of times a day then is the system doing what it’s for.
Checks you can do
- Time a cycle. Note how long the pump runs and how long the pit takes to refill. Write it down on a wet day and a dry day.
- Watch the outlet outside while the pump runs. Water should come out right away and flow away from the house.
- Listen after it stops. A gurgle or a rush of water back into the pit means a leaking check valve.
- Look at the float. It should move freely and drop when the pit empties.
- Check the season. Weeks of cycling in March is normal on wet till; the same in a dry August isn’t.
Problems worth fixing
- Recycled water. If the discharge ends near the house, pumped water soaks back toward the foundation and returns to the pit. Extend it at least 10 feet onto ground that slopes away. See discharge and freezing.
- A leaking check valve. Water in the pipe falls back into the pit after every cycle. Replacing the valve is a cheap fix.
- A stuck float or failed switch. The pump keeps running after the pit is empty, which overheats it.
- An undersized pump. It runs nonstop and still loses ground in the wettest weeks. See replacement.
- A frozen or clogged discharge. The pump runs but nothing comes out outside.
Protect the basement while it works this hard
- Add a battery backup and a high-water alarm.
- Test the pump and backup before each spring.
- Budget to replace a hard-working pump before it reaches the end of its life.
When to call
Call a plumber or waterproofing contractor if the pit never drops, the pump runs while the pit is empty, the breaker trips, or water reaches the floor. Common repairs typically cost about $75-$550, and a replacement in an existing pit $400-$1,200 (published ranges; sources). If water shows up at the floor-wall joint while the pump works, the drainage needs attention as well as the pump.