Drainfields are designed to distribute the water from the septic tank into a leach field. The waste water filtrates through a biomat and into the soil. The soil continues to remove remaining impurities through aerobic digestion. If you see liquid waste on the surface ofthe drain fields, contact McDonald Septic Services right away. Regularly scheduled maintenance of commercial kitchen grease traps prevents build up and blockage of sewer lines and drains. Keep your commercial kitchen running smoothly and your business in compliance with state and local regulations.