Garage sump pit - ai picture
A sump pump (a pump that pushes water out when it cannot flow downhill) sits in a pit. The pit is at the lowest part of your yard or in the crawl space (the low, open space under some houses). Sump pump installation sets up the pit, the pump and its pipe. The pump switches on by itself as water rises and sends it to a safe place, away from the house.
The estimate is free, and you do not have to hire anyone.
Why do Houston yards need a sump pump?
Houston yards need a pump when the water has nowhere lower to go. Much of the city is very flat, so a drain pipe often cannot slope down far enough to reach the street. Bush Intercontinental Airport gets 51.84 inches of rain a year, and much of it comes in short, heavy storms.
Most of the city also sits on gumbo (sticky grey-black clay). Wet gumbo closes up, so rain sinks in very slowly. A low corner of the lawn can then hold water for days.
A yard pump removes water from a low corner. It can also serve the end of a French drain (a trench filled with gravel, with a pipe at the bottom). Under a raised house, a crawl space sump pump keeps the crawl space dry. More is on the page about foundation and crawl space drainage.
How does a sump pump work?
A sump pump works by itself: as water fills its pit, a float switch (a switch that floats up as the water rises) starts the pump. The pump pushes the water up and out through a pipe. When the pit is almost empty, the float drops and the pump stops.
It has five parts:
- The pit. A plastic basin, usually 18 to 24 inches wide, set in gravel at the lowest point.
- The pump. A small electric pump that sits in the water at the bottom of the pit.
- The float switch. It turns the pump on and off as the water level changes.
- The check valve. A one-way valve on the pipe, so pumped water cannot run back into the pit.
- The outlet pipe. A 1.5-inch pipe that carries the water to the street, a ditch or a lower part of the yard.
Water can reach the pit in two ways. It can run in from the surface through a grate on top. It can also arrive through a buried drain pipe, such as a French drain under the lawn. Many Houston yards use both.
How is a yard sump pump installed?
The installer finds the lowest point, digs the pit, sets the pump and runs the outlet pipe, usually in one day.
- Mark buried lines. Call 811 (the free number that marks buried lines before digging).
- Find the true low point. The pit goes where the water really collects after rain, not just where the ground looks lowest.
- Dig and set the pit. The basin sits on a gravel base, with its lid at or just below the lawn.
- Lay the outlet pipe. Solid pipe (pipe with no holes) runs from the pump to the outlet, with the check valve near the pump.
- Bring power to the pit. An electrician adds a GFCI outlet (a safety outlet that cuts the power if it senses a fault) for the pump.
- Test and close up. A few buckets of water show that the pump starts, empties the pit and stops.
Where does the pumped water go?
The pumped water goes to a place where it can leave the property, such as the street gutter or a ditch. It should never come back toward the house.
The most common outlet in Houston is a curb outlet, where the pipe comes out through the curb into the street gutter. Where the street is too far, the water can go to a lower part of the yard. It can also go to a pop-up emitter (a small cap in the lawn that opens to let water out). A dry well (an underground pit filled with stone) works only where the soil drains well. Houston clay often drains too slowly for one, as explained in the dry well and French drain comparison.
Some lines connect to the storm sewer (the pipes under the street that carry rain away). For a link like that, the City of Houston's Storm Sewer Permit costs $128.81 at the time of writing. Most yard pump lines do not connect to the storm sewer. Either way, the line is solid pipe with no holes, so the water cannot soak back into the clay near the house.
What size sump pump does a yard pit need?
Most yard pits need only a small pump, because the water is lifted just a few feet. Pump makers rate pumps by motor size in horsepower (HP) and by how high and how fast they can push water:
| Pump size | Can push water up about | Typical use |
|---|---|---|
| 1/4 HP | 7 to 8 feet | A shallow yard pit next to the curb |
| 1/3 HP | 10 feet, at about 30 to 40 gallons a minute | Most yard and crawl space pits |
| 1/2 HP | 15 feet | A long pipe run or a high outlet |
For an existing pit, the installer can time how fast it fills in a storm. An 18-inch-wide pit holds about 1.1 gallons for each inch of water depth. So if the water rises 10 inches in one minute, about 11 gallons a minute come in. Pick a pump that can still move more than that, even with the full height and length of pipe.
Does a sump pump need backup power?
Yes. A sump pump stops when the power goes out, so backup power matters where water in the pit could reach the house or garage. One week after Hurricane Beryl in July 2024, more than 88,000 customers of CenterPoint (the local power company) in the Houston area still had no power.
A battery backup pump sits in the same pit and runs on its own battery when the main pump has no power. It also takes over if the main pump fails. A battery lasts for hours of steady pumping, not days, so a generator is the next choice for a long outage.
How long does a sump pump last, and how is it cared for?
Sump pumps often last about ten years. Before storm season, repeat the bucket test from installation day. Clear leaves and silt (tiny bits of soil) from the pit and from the pump's intake screen (the grate where water enters). Check that the end of the outlet pipe is open.
A pump that hums but moves no water needs a repair or a new pump. Sump pump replacement usually reuses the same pit and pipe, so it usually costs less than a new system.
Can I install a sump pump myself?
You can replace a worn-out sump pump yourself if the pit already works. A new system is harder: the pit is dug in heavy Houston clay, the pipe needs a steady downhill slope, and the pump must suit the water. If the pump is too small or water runs back toward the house, the job has to be done again, often by an installer you pay extra.
What does sump pump installation cost in Houston?
Based on several national cost guides, a sump pump with a new pit costs about $750 to $1,800 installed. These are national prices, not a Houston survey. The length of the outlet pipe, a battery backup and lawn repair change the price most.
A low spot may also need a catch basin (a box in the ground with a grate) or a channel drain (a long, narrow drain with a grate) to gather the water first. Both are covered on the page about catch basins and channel drains. For prices across every service, see what a French drain and its outlet cost.
Sump pumps are installed in Houston and nearby towns such as Pearland, League City and The Woodlands.
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Some content may be written with AI and then reviewed by a person.