Hey, it’s Mark Reynolds here, to teach you how to diagnose whether your septic drain field has failed. There are typically clear signs of septic drain field failure. Once you understand these, you’ll be better prepared to take action in the event of septic system failure. These are the four most common signs of septic drain field failure: 1.) Sluggish outside house drains 2.) Foul odors outside 3.) Saturated Leach …