To install a sump pump, you first need to dig a basin hole in the lowest part of your basement or crawlspace, then place the pump, connect the discharge pipe, and ensure proper drainage. This how to install a sump pump guide will walk you through each stage, from gathering tools to testing your system, helping you protect your home from water damage.
What You’ll Need to Install a Sump Pump
Before starting, gather the essential tools and materials. Many items are inexpensive and available at any hardware store. Below is a checklist:
- Submersible or pedestal sump pump (horsepower based on your water table)
- Sump basin (pre-drilled for inlet pipes)
- Discharge pipe (PVC Schedule 40, usually 1½” or 2”)
- Check valve
- PVC primer and cement
- Hacksaw or pipe cutter
- Shovel or post-hole digger
- Gravel or crushed stone (for basin base)
- Level
- Electrical conduit and GFCI outlet (if not already present)
- Safety glasses and gloves
Step-by-Step Installation Process
Step 1: Choose the Right Location
The sump pump must be placed at the lowest point of the basement or crawlspace where water naturally collects. Check for a pre-existing sump pit or dig one yourself. Keep the pump away from interior walls that share a foundation to avoid structural interference. Always verify local plumbing codes – the International Association of Plumbing and Mechanical Officials (IAPMO) provides standards for proper sump installation.
Step 2: Dig the Basin Hole
Using a shovel or post-hole digger, excavate a hole approximately 2 feet deep and 18 inches in diameter (or as required by your basin size). The hole should be slightly wider than the basin to allow backfill with gravel. Place a 2–3 inch layer of gravel at the bottom for drainage and to support the basin base. Use a level to ensure the bottom is flat.
Step 3: Prepare the Sump Pit
Set the sump basin into the hole, ensuring the top rim is flush with or slightly above the floor to prevent debris from falling in. Drill or cut an inlet hole for the drain tile discharge line if your basin isn’t pre‑drilled. Backfill around the basin with gravel, tamping it down to stabilize the unit. Do not use concrete – gravel allows water to flow freely into the basin.
Step 4: Install the Sump Pump
Place the pump inside the basin. For submersible models, ensure the pump sits level on the bottom. Pedestal pumps mount above the basin with the motor on a bracket; follow the manufacturer’s height guidelines. Connect the pump’s discharge outlet to the vertical PVC pipe that will carry water out of your home. Most pumps come with a built‑in union or threaded adaptor – hand‑tighten and then use PVC cement for a permanent bond.
Step 5: Connect the Discharge Pipe
Run the discharge pipe from the pump upward toward the ceiling or through the foundation wall. Use a hacksaw to cut pipe sections to the correct length, and join them with PVC primer and cement. The pipe should slope slightly upward to prevent backflow. Outside, direct the discharge at least 10 feet away from your foundation to avoid water re‑entering the basement. Install a check valve near the pump to stop water from flowing back into the basin when the pump turns off.
Step 6: Check Valve and Fittings
Place the check valve in the vertical section of the discharge line, about 12 inches above the pump. The arrow on the valve must point away from the pump (toward the outlet). Cut the pipe, add the valve, and secure with PVC cement. Test the valve by pouring a small amount of water into the basin – it should hold the water in the discharge line after the pump cycles.
Step 7: Electrical and Safety Considerations
Sump pumps require a dedicated, grounded 120‑V outlet on a GFCI circuit. If your basement lacks a GFCI, hire a licensed electrician. Use watertight conduit for exposed wiring near the basin. The U.S. Centers for Disease Control and Prevention (CDC) advises keeping all electrical components dry to prevent shocks and fire hazards. Never place the power cord where it can be submerged.
Step 8: Test the System
Fill the basin with water from a bucket until the float switch activates the pump. The pump should turn on, remove the water, and shut off automatically. Listen for unusual noises, check for leaks at all joints, and ensure the discharge pipe carries water away efficiently. Repeat the test two or three times. If the pump cycles excessively, adjust the float switch or check the check valve.
Sump Pump Sizing and Type Comparison
Choosing the right pump depends on your basement size, water table, and expected flow volume. The table below compares the two common types:
| Feature | Pedestal Sump Pump | Submersible Sump Pump |
|---|---|---|
| Motor location | Above the basin (on a bracket) | Inside the basin (sealed) |
| Noise level | Louder – motor is exposed | Quieter – motor is underwater |
| Durability | Motor lasts longer but less protected | Sealed motor resistant to debris and moisture |
| Installation complexity | Simpler – no submerging | Requires precise basin depth |
| Typical US cost range (materials only) | $100 – $250 | $200 – $500 |
Prices vary widely by region and brand. For a typical home, a 1/3‑horsepower submersible pump is sufficient for most residential sump applications.
Common Mistakes to Avoid
- Installing the pump without a check valve – water will flow back and cause short cycling, reducing pump life.
- Positioning the discharge pipe too close to the foundation – water can seep back into the basement.
- Using the wrong size pipe – undersized pipe creates back pressure and reduces efficiency.
- Forgetting a battery backup – power outages often happen during heavy storms when you need your pump most.
- Skipping the gravel base – without gravel, sediment clogs the basin and pump intake.
When to Call a Professional
While many homeowners can tackle a sump pump installation, complex situations – such as cutting through a concrete floor, running new electrical circuits, or integrating with existing drain cleaning systems – are best left to licensed plumbers. If your home has a high water table or frequent flooding, our team can assess your property and recommend a custom solution. We also offer water heater repair and routine sump pump maintenance to keep your entire plumbing system in top shape.
Need expert help with your sump pump installation? Contact MyTownPlumber today for a free estimate and professional service. Protect your basement and enjoy peace of mind with a properly installed system.