Sump Pump Running Constantly

If your sump pump runs every few minutes or never shuts off, something is wrong. A healthy sump pump cycles on for one to three minutes, then rests for ten to thirty minutes between rain events. Constant running means either water keeps entering faster than the pump can handle, the float switch is stuck, or the pump is sending water right back into the pit. Free diagnosis — call (813) 343-2212.

Why Sump Pumps Run Constantly: The Most Common Causes

Most homes in Tampa Bay that have sump pumps are sitting in crawl spaces or garage pits in low-elevation areas of Hillsborough, Pasco, and Pinellas counties. Coastal neighborhoods like Apollo Beach, Ruskin, Gibsonton, and Shore Acres near Tampa Bay sit at or just above sea level. The water table there is high year-round, and during our June-September rainy season it can rise within a foot of the surface. That means your pump is doing real work — but if it never stops, something specific is broken.

Here are the six most common reasons a sump pump runs constantly in this area.

1. Float Switch Stuck in the ON Position

The float switch is a small plastic component that floats on the water surface inside your pit. When water rises, the float rises with it and tells the pump to kick on. When the water drops, the float drops and the pump shuts off. If the float gets wedged against the side of the pit, tangled in the power cord, or the switch mechanism inside it fails, the pump gets a permanent “on” signal and runs forever — even in dry weather.

This is the single most common cause of constant running we see on service calls throughout Tampa Bay. The float is inexpensive, but it still requires draining the pit, inspecting the switch travel, and verifying proper installation height. A stuck float that gets ignored will burn out your pump motor within days.

2. Failed Check Valve — Water Siphons Back and Re-Triggers the Pump

A check valve sits on the discharge line and acts as a one-way door: water pumped out stays out. When the check valve fails or is missing entirely, every time the pump shuts off, the water column in the vertical discharge pipe flows backward into the pit. That refills the pit, the float rises again, and the pump kicks right back on. You end up with a pump that runs for one minute, shuts off for thirty seconds, and runs again — endlessly.

You can hear this happening. If your pump shuts off and about ten to fifteen seconds later you hear a gurgling rush of water back into the pit, the check valve is either failed, installed backwards, or missing. This is an easy repair but it will destroy your pump if ignored because the motor is not built for that duty cycle.

3. Undersized Pump for the Pit Volume and Water Table

A pump rated for a low-volume pit in a dry climate is not the right pump for a coastal Tampa Bay home with a high water table. If the pump is moving water slower than groundwater is entering the pit, it will run continuously without ever winning. This happens after a pump replacement where the homeowner bought a lower-capacity unit to save money, or in older homes where the original pump was sized for a different drainage condition than what the lot has today.

A properly sized residential sump pump for most Tampa Bay conditions needs a pumping capacity of at least 1,800 to 2,400 gallons per hour at a ten-foot head height. If you have a 1/4 HP economy unit in a coastal neighborhood, you probably need a 1/2 HP or 3/4 HP pump.

4. High Water Table — Common in Low-Elevation Tampa Bay Neighborhoods

Some homes in this region are in areas where the water table is genuinely high enough that during rainy season the pump runs frequently by design. Hillsborough County’s elevation ranges from sea level along the bay and river corridors up to about 50 feet in the Brandon and Temple Terrace areas. Neighborhoods like Ruskin, Sun City Center, Apollo Beach, and coastal Pinellas often have water tables within two to four feet of the surface after a heavy rain event.

If your pump runs constantly only during and after heavy rain, that may be normal. If it runs constantly even during dry weather in January, the water table alone is not the cause — you have a mechanical problem on top of it.

5. Cracked Pit Allowing Groundwater Infiltration

Sump pits in Florida are typically concrete or plastic. Concrete pits crack over time from soil movement and root intrusion. A cracked pit essentially turns into a collection point for groundwater regardless of surface rainfall. Water seeps in through the cracks constantly, and your pump can never keep up because it is fighting groundwater pressure, not just surface drainage.

You can identify this by checking whether the pit has visible cracks or seeping stains on the walls, and by monitoring whether the pump runs even during extended dry spells. A cracked pit needs to either be sealed with hydraulic cement or replaced entirely.

6. Discharge Line Problems — Too Long, Too Much Elevation, or Blocked

If the discharge line is extremely long, has too many horizontal runs, or terminates at a point much higher than the pump, the pump has to work harder and takes longer per cycle. A partially blocked or frozen (unlikely in Tampa but possible in cold snaps) discharge line can cause back-pressure that reduces pump output, causing it to run longer. Also verify the discharge outlet is at least ten feet from the foundation and not dumping water back toward the house or into a low point that drains back to the pit.

How to Time Your Pump Cycle (Normal vs. Problem)

The easiest first diagnostic you can do yourself is to time the cycles. During or right after rain:

• Normal: pump runs one to three minutes, shuts off, stays off for ten to thirty minutes or longer
• Check valve problem: pump runs one to two minutes, shuts off, restarts within thirty to sixty seconds
• Float stuck: pump runs continuously with no shutoff at all
• Undersized pump or cracked pit: pump runs four to six minutes per cycle with very short rest periods

Time three full cycles and write down the on-time and off-time. That information tells our technicians a lot before we even open the pit.

Diagnosis and Repair Cost Breakdown

What Happens If You Ignore a Constantly Running Sump Pump

A sump pump motor is designed for intermittent duty, not continuous operation. Running nonstop will burn out the motor in days to weeks depending on the pump quality. A burned-out pump in the middle of a Tampa rainy season with standing water under your house or in your garage is a much bigger problem — and a much bigger bill — than the repair would have been.

In crawl space homes common in older Tampa neighborhoods and in Hillsborough County’s flatlands, a failed pump during hurricane season can flood the crawl space, soak insulation, and create mold conditions within 48 to 72 hours. This is not a problem to postpone.

Steps to Inspect the Float Switch Yourself

If your pump never shuts off and the pit water level looks normal or low, the float switch is the first thing to check. Here is what to do safely:

1. Turn off power to the pump at the circuit breaker or unplug it before touching anything inside the pit.
2. Lift the pump out of the pit (most residential units are not bolted down).
3. Check whether the float arm moves freely through its full range of motion without hitting the pit wall or power cord.
4. Manually position the float in the down (off) position and plug the pump back in momentarily to see if it starts immediately — if it does, the switch is failed and needs replacement.
5. Check the position of the float arm against the power cord. If the cord is wrapped around the float, the cord itself is holding the float in the up (on) position.

If the float moves freely and the switch still fails, the internal mechanism is faulty and the float assembly should be replaced. This is a $40 to $80 part at any hardware store but requires correct sizing for your pump model.

How to Test a Check Valve

With the pump running, watch the discharge line. When the pump shuts off, put your hand near the inlet pipe inside the pit (not touching it) and listen. You should hear the pump stop and then silence. If you hear a rush of water flowing back into the pit within ten to twenty seconds of the pump stopping, the check valve is either bad or missing. Visually inspect the discharge line above the pit for a check valve — it will look like a thickened section of pipe with an arrow indicating flow direction. If there is no check valve at all, that is your problem.

When to Call a Plumber

Call us when:

• The pump runs during dry weather with no rain in the last 48 hours
• You can see or hear water flowing back into the pit after the pump shuts off
• The pump runs but the water level in the pit never drops
• You smell burning from the pump (motor overheating)
• The pump is more than seven to ten years old and showing any constant-run behavior

We provide a free diagnosis on every sump pump service call. If we find the problem and you approve the repair, the $279 minimum labor applies to the repair work. You never pay a fee just for us to look.

Tampa Bay Rainy Season Prep for Sump Pump Owners

Before June hits, test your sump pump by pouring five gallons of water slowly into the pit and watching the float rise and trigger the pump. The pump should start, clear the water within two to three minutes, and shut off cleanly. Do this in May every year. Also check the discharge line outlet for debris, wasp nests, or blockages — these are surprisingly common in Florida where insects love to nest in pipes during the dry season.

If your home is in a flood-prone area of Hillsborough County — particularly anywhere along the Hillsborough River corridor, near Tampa Bay, or in low areas of Ruskin and Gibsonton — a battery backup sump pump is worth considering. Power outages during the same storms that flood your yard will leave you without a functioning pump at exactly the wrong moment.

Get Your Sump Pump Diagnosed Today — Free

If your sump pump is running constantly, do not wait. The problem is not going to resolve itself, and a burned-out pump in the middle of Tampa’s rainy season creates a cascade of water damage problems that cost far more than the original repair. Our licensed plumbers (CFC1431159) serve all of Tampa Bay including Hillsborough, Pasco, and Pinellas counties — same-day appointments available.

Call us at (813) 343-2212 or visit our plumbing services page to book online. Free diagnosis, upfront pricing, $279 minimum labor on approved repair work. No surprises.