How to Fix a Saturated Leach Field: 3 Potential Methods

If your enjoyable time in the backyard has been impacted by some stinky odors from the leach field, you may be dealing with a saturated leach field. While you may not think much of it at first, a saturated leach field can lead to many problems in your home, yard, and even the local ecosystem if the water runs off into nearby creeks or streams. Learn how to fix a saturated leach field and when you should call a pro to come in and make necessary repairs.

Why Is a Saturated Leach Field a Problem?

A saturated leach field indicates some type of problem with your septic system. Often, this is excessive wastewater produced by the household. If you don’t have the right size septic tank for the amount of wastewater your home generates, it can overload the leach field, where partially treated wastewater from a septic tank goes for final treatment before it returns to the groundwater. 

This can cause the extra wastewater to pool in the leach field, damaging your lawn. Or, the wastewater can back up into your home’s drains. Additionally, the pooling water over the leach field can run off into local waterways, where it can contaminate the water. Aside from the potentially costly damages to your plumbing and yard, the wastewater also poses health risks, like waterborne illnesses, for your family.

How Much Does It Cost to Repair a Septic Leach Field?

If you suspect problems with the leach field, you may want to first schedule an inspection to identify the cause. A septic system inspection costs $200 to $900. If you can’t fix the leach field through additives or septic tank pumping, expect to spend an average of $5,000 to $12,000 for the cost to install a new drain field.

Signs of a Saturated Leach Field

There are several signs to watch for that may reveal a saturated leach field or other major septic system problems, from stinky smells in your drains to pools of water over the leach field. Some signs of a saturated leach field include:

• Pooling water over the leach field

• Foul odors, similar to rotten eggs, in your home’s drains or in your yard

• Spongy soil over the leach field

• Grass that’s greener or lusher than normal over the leach field

• Slow drains in the home

• Toilets that struggle to flush

• Water backing up into your home’s drains

A leach field lasts 15 to 30 years, so if you have one that’s over 15 years old and having issues, you may need to replace it.

How to Fix a Saturated Drain Field

There are many ways to fix a saturated leach field. For homeowners, the easiest option to start with is to use store-bought additives to help reduce bacterial imbalances in the leach field. However, most leach field issues will need professional attention because stagnant wastewater—which may contain bacteria like E.coli, parasites, and viruses, according to the Centers for Disease Control and Prevention—can quickly become a health hazard to your family and the local ecosystem.

Whether DIY or with some help from a trained professional, here are a few ways to fix a saturated leach field.

Method 1: Use Additives to Restore Bacteria Balance

A highly effective way to fix a saturated leach field without a pro’s help is to add specialized bacteria and enzymes to your septic system. These biologic additives reduce the biomat layer and restore a balance of anaerobic and aerobic bacteria in the soil of the leach field. This process will help restore the flow of water through your leach field. 

The biomat is a jelly-like substance in the soil around the leach field where the effluent from the septic tank is released for further treatment. The anaerobic bacteria consume the biomat, which turns it into water and carbon dioxide.

The aerobic bacteria in the soil also help maintain the biomat layer at an acceptable thickness. If it’s too thick, the biomat can clog the leach lines and cause oversaturation. You can find enzyme additives for septic tanks and leach fields at a home improvement store near you or online to help reduce the biomat to a healthy level.

1. Pour in the Additives

Following the product’s instructions on the label, pour the enzymes into a toilet, the distribution box of your septic system, or the inspection port of your septic tank. The label will tell you exactly how to apply the additives.

2. Follow the Allotted Waiting Time

Again, consult the label of the product you’re using to determine how long to wait for the additives to start working. Products may take a few days up to a few weeks before you start to notice any changes to the leach field.

3. Add Additional Enzymes as Needed

You may want to repeat this process again after several weeks to continue fixing the saturated drain field. However, don’t let a saturated drain field sit for too long as you wait for the additives to work. A saturated drain field could be a sign of a more serious issue, and it’s better to schedule an inspection than wait months for the added bacteria and enzymes to make any progress.

Method 2: Schedule a Septic Tank Cleaning

A saturated leach field can be a sign that the septic tank is full, which is easy to fix with the help of a local septic tank cleaner. Many cities, counties, and even states require a licensed pro or company to pump septic tanks and properly remove the waste, so you shouldn’t try to pump the tank yourself. Be sure to schedule septic tank cleaning services every three to five years.

Method 3: Install a Larger Septic Tank

If restoring the biomat and pumping the septic tank still don’t fix the saturated leach field, it could be because your septic tank doesn’t have the capacity to handle the amount of wastewater coming from your home.

Installing a bigger septic tank is not something homeowners can DIY. In most places, only a certified or licensed professional can handle septic system installations and replacements. Consult with a local septic tank company to determine the right septic tank size to meet your needs, secure appropriate permits, and move forward with this project.

How to Prevent a Leach Field From Saturating

Preventing a saturated leach field requires regular inspections and maintenance to catch potential problems, like clogs or excess wastewater generation, early. Some ways to prevent a saturated leach field include:

• Only flush toilet paper.

• Minimize the amount of oils, fats, and grease going down drains.

• Don’t put items in a septic system that can lead to clogs, such as wet wipes or menstrual products.

• Avoid driving vehicles or other heavy machinery over the drain field.

• Don’t place any structures, like sheds, over the leach field.

• Schedule a septic tank pumping service every three to five years.

• Schedule annual septic system inspections.

DIY vs. Hiring a Septic System Pro to Repair a Leach Field

Using additives to try to thin out the biomat layer of the leach field costs $15 to $75 if you want to DIY fix a saturated drain field. Keep in mind, though, that this may just be a temporary solution, especially if you’re generating too much wastewater for your septic system to handle. Septic system repairs need to be handled by a septic system company. Septic system repairs cost $630 to $3,000 on average.