Sump Pump Running Constantly or Not Working: Causes and Fixes

What are the 5 causes of a sump pump running constantly?

The 5 causes of a sump pump running constantly are listed below.

• A stuck float switch keeps the pump on.
• A failed check valve lets pumped water flow back into the pit.
• A pump too small for the inflow never empties the pit.
• A high water table refills the pit after heavy rain.
• A frozen or blocked discharge line stops the water from leaving.

Is a sump pump running constantly a problem?

Yes, a sump pump running constantly is a problem when the pit is dry or the weather is dry, because the motor wears out and the pump fails when it is needed.

What should you do when the sump pump runs constantly?

The 4 things you should do when the sump pump runs constantly are listed below.

1. Look into the pit to see whether water is coming in.
2. Release the float switch from the side of the basin.
3. Check the discharge line outside for ice or blockage.
4. Call a plumber when the pump keeps running in dry weather.

When should you call a plumber?

You should call a plumber in the 4 situations below.

• The pump runs with a dry pit.
• Water flows back into the pit after each cycle.
• The pump is more than 7 years old.
• The pump does not start when the pit fills.

Related plumbing problems and next steps

How much does the plumbing repair cost?

The plumbing repair cost depends on the fix: sump pump repair costs $300–$700, and replacement costs $645–$2,102, according to HomeAdvisor. Sump pump repair prices and local plumbers are on the sump pump repair in Lancaster County page.

What is a related plumbing problem?

A related plumbing problem is water in basement who to call, and the water in basement who to call guide lists its causes and first steps.

Written and fact-checked by the Lancaster PA Plumbers editorial team using HomeAdvisor, EPA WaterSense and City of Lancaster data. Last updated October 29, 2026.