How to Install a Sump Pump Backup System

A backup sump pump system usually means adding a second pump that runs on battery power when the main pump fails or during a power outage. Another option is a water-powered backup that uses municipal water pressure to eject water, which works even without electricity. Both types have pros and cons, so think about your basement layout and how often you lose power.

The battery-powered backup is more common and can handle larger volumes of water. The water-powered version is simpler and requires no battery maintenance, but it uses more water and may not be allowed in all areas. Check your local building codes before buying anything.

If you live in Burnsville, keep your shutoff valve location written down. That way, you can find it quickly if water rises.

• Battery backup pump with its own float switch
• Water-powered backup pump
• Secondary AC pump on a separate circuit
• High-water alarm system

Place the backup pump in the sump pit next to the primary pump. The float switch on the backup pump should be set to activate at a higher water level than the primary pump, so it only runs when the main pump fails. Secure the pump to a solid surface to prevent movement.

Connect the discharge pipe from the backup pump to a separate line that exits the pit, or tie it into the main discharge pipe after the primary pump's check valve. Use a check valve on the backup line to prevent water from flowing back. Glue all PVC joints and allow them to dry.

If you are using a water-powered backup, connect it to the water supply line and the sump discharge. Follow the manufacturer's instructions carefully, as these systems have specific requirements.

After installation, fill the sump pit with water to trigger the backup pump. Watch it cycle on and off. Check for leaks at all pipe joints. Make sure the backup pump discharges water outside, away from the foundation.

Maintain the battery by checking the water level (if it's a wet cell battery) and cleaning terminals. Replace the battery every few years as the manufacturer recommends. Clear any debris from the pit that could clog the pump intake.

If your primary pump fails and you have a sewage backup, you may need professional cleanup. Water damage from sewage can be a health hazard. Local water damage pros can handle the sanitation and structural drying.

• Test monthly by lifting the float
• Clean the pit and pump intake
• Check battery voltage
• Inspect check valves for debris
• Replace battery per manufacturer guidance