Massachusetts Plumbers Journeyman Practice Exam

What is the minimum discharge capacity required for a sewage-ejector pump in single-family dwellings?

1. 10 gallons per minute

2. 15 gallons per minute

3. 20 gallons per minute

4. 25 gallons per minute

The correct answer is: 20 gallons per minute

In Massachusetts, the minimum discharge capacity required for a sewage-ejector pump in single-family dwellings typically needs to meet the demands of the household's wastewater flow. A capacity of 20 gallons per minute (GPM) is generally recognized as sufficient to handle typical wastewater discharge from various plumbing fixtures in a single-family home, including kitchen sinks, dishwashers, and bathrooms. This capacity ensures that the sewage-ejector pump can efficiently manage peak usage times, reducing the risk of backups or overflows. The requirement is designed to promote adequate drainage and maintain sanitary conditions within the dwelling. A capacity of 20 GPM strikes a balance between efficiency and reliability in handling household waste, which is why it is often established as the minimum standard for sewage-ejector pumps in this context.