Leach fields

The leach field, also called a drain field, is where most of the treatment happens and where the most expensive problems start. These guides cover how it works, how to protect it and what its failure looks like.

How long does a leach field last? Many leach fields last 20 years or more with good care, but there's no fixed lifespan. See what sources say and what shortens the life of a field.
How to maintain a leach field Protect your leach field by pumping on schedule, limiting water and keeping vehicles and roots away. See a simple plan based on official guidance.
Replacing a leach field and what it costs Published guides put drain field replacement at about $3,000 to $15,000, and mound fields higher. See what drives the price and what the job involves.
What is a leach field? A leach field, or drain field, is the buried part of a septic system that spreads liquid into the soil for treatment. Learn how it works and what harms it.
How deep is a leach field? Many leach field trenches sit about 1.5 feet down, but depth runs from inches to several feet. See typical depths and how to find your own.