Rhode Island Journeyman Plumber Practice Exam

What is the minimum distance required from a septic tank to a private water supply (well)?

1. 10 feet

2. 25 feet

3. 50 feet

4. 100 feet

The correct answer is: 50 feet

The minimum distance required from a septic tank to a private water supply, such as a well, is established primarily to prevent contamination of the water supply. This distance aims to protect groundwater from pollutants that may leach from septic tanks, which can contain harmful pathogens, nutrients, and other contaminants. Setting this distance at 50 feet is grounded in the understanding that even with proper operation and maintenance of the septic system, any potential contaminants will have a great enough distance to dissipate and reduce their concentration before reaching the well water. The 50-foot requirement is recognized as a standard in many guidelines to ensure the safety and purity of drinking water drawn from private wells. Choosing a shorter distance would significantly increase the risk of contamination, while a longer distance may not be necessary under typical circumstances, making 50 feet a practical balance between safety and feasibility.