Sewage Ejection Pump Maintenance and Reporting

Estimated reading time: 5 minutes

In some situations, wastewater from a home cannot flow by gravity to the municipal sewer line due to elevation differences. This drawing illustrates how a grinder pump system collects and lifts sewage from a lower elevation to a higher municipal sewer line.

When wastewater enters the grinder pump basin, a float switch or float sensor detects the rising liquid level and activates the pump. The pump grinds the waste into a slurry and forces it through a pressurized pipe until it reaches a point where it can continue by gravity to the main sewer. This setup ensures reliable waste disposal where gravity flow is not feasible.

A visual inspection of a sewage ejector pump system is typically limited unless there are accessible service records, written documentation, or apparent signs of malfunction (such as noise, odor, or leaks).

Below is a breakdown of a sewage ejector pump’s maintenance schedules, standard components, and inspection considerations.

Download Sample Inspection Protocol.

Service and Maintenance Frequency:

• General Pump Maintenance: Every 3 to 5 years under regular use. This includes inspecting and servicing the pump, float switch, and pit to ensure they’re clean and debris-free.
• Heavy Use: Consider annual maintenance if the pump handles a large volume of waste (e.g., in homes with multiple bathrooms draining to the pump).
• Power Outage Backups: If your area has frequent power outages, you may need to check the backup system (if installed) more frequently (e.g., every 6 months).

Pump Lifespan:

• A well-maintained sewage ejector pump typically lasts 7 to 10 years, although some high-quality systems can last up to 15 years.

Key Components to Inspect and Service:

1. Pump Motor:

• Purpose: Pumps wastewater up to the sewer line.
• Service Check: Listen for unusual grinding or whining noises, which indicate potential motor issues.

2. Float Switch:

• Purpose: Detects the water level in the pit and activates the pump.
• Service Check: Ensure the float is not stuck due to grease or debris.
• Maintenance Tip: Check for buoyancy and free movement to avoid false triggers.

3. Check Valve:

• Purpose: Prevents wastewater from flowing back into the pit after pumping.
• Service Check: Listen for “water hammer” noises—these could indicate the check valve is not sealing properly.
• Lifespan: Typically lasts 5–7 years but may need replacement sooner if noises occur.

4. Pit and Lid:

• Purpose: Houses the pump and seals the system to prevent odors and gas escape.
• Service Check: Check for cracks or poorly fitted lids that can lead to odor leaks or sewer gas exposure.

Inspection Considerations During Visual Inspections:

1. Access to Written Records:
   • Check for any maintenance logs or stickers indicating service dates.
   • Ask homeowners if they have records from plumbers or contractors.
2. Visible Signs of Poor Performance:
   • Odor of sewage near the ejector pit.
   • Water stains around the pit can indicate overflow.
   • An audible alarm is typically installed if the pump system has a backup notification. Note the alarm horn or mechanism.
3. Homeowner Inquiries:
   • Ask if the pump has failed before and whether they’ve noticed frequent cycling (indicates an issue with the float or check valve). Ask for records.
   • Inquire about power backup—many systems have battery or generator backup for power outages. Locate the battery storage area and wiring.

Red Flags in Inspection Reports:

• No backup power source: A home relying solely on municipal electricity is vulnerable to pump failure during an outage.
• No recent maintenance records: If service has not been performed within 5 years, recommend having a licensed plumber inspect and service the pump.
• Evidence of sump pit debris: Items like grease, hair, or foreign materials can clog the float and affect performance.

Frequently Asked Questions