Which of the following distances must be maintained from any other nitrification field (except repair areas)?

Maintaining a distance of 20 feet from any other nitrification field is crucial for several reasons. First, it helps to ensure proper soil aeration and oxygen flow, which is essential for effective nitrification. Additionally, this spacing reduces the risk of contamination between adjacent fields, which could compromise the functioning of the septic system. Nitrification relies on bacteria to convert ammonia into nitrates, and if two fields are too close together, it may lead to competition for resources and imbalances in bacterial populations.

Furthermore, adequate spacing allows for the proper maintenance and access to each field, which is important for inspections, repairs, and ensuring long-term performance of the septic system. Adhering to the 20-foot requirement also aligns with regulations and best practices designed to protect groundwater and overall environmental health.