7 signs your septic system is failing

A septic system rarely fails all at once. It usually sends signals for months first. Catching them early can mean the difference between a pump-out and replacing the leach field.

Here are the signs we see most often, roughly from least to most serious.

1. Every drain in the house is slow

One slow sink is a plumbing clog. When all the fixtures drain slowly, especially the lowest ones in the house, the problem is usually downstream: a full tank, a blocked outlet, or a leach field that isn't taking water.

2. Gurgling pipes

Gurgling when a toilet flushes or the washer drains means air is being pushed through water in the pipes. It can be a venting problem, but it's also a common early sign that wastewater isn't flowing out of the house freely.

3. Sewage odors

A sewer smell in the basement, near the tank, or over the leach field is a warning. Some odor near the tank cover during a pump-out is normal. A smell that hangs around the yard is not.

4. Soggy ground or standing water over the leach field

If the ground over the leaching area stays wet when the rest of the yard is dry, effluent may be coming to the surface. This is one of the clearest signs of a failing leach field, and it's a health concern. Keep kids and pets off it.

5. Grass that's greener over the system

Bright green stripes or patches over the leach field, especially in a dry stretch of summer, can mean the grass is being fed by effluent that's too close to the surface.

6. Backups after heavy water use

If sewage backs up into the lowest drain or a basement shower after laundry day, a party or a long rain, the system is close to its limit. Spread out laundry and avoid big water use until it's looked at.

7. Nitrates or bacteria in your well

If you have a private well and a water test comes back with high nitrates or bacteria, a nearby septic system is one possible source. Get both looked at.

Full tank, or failing leach field?

This is the question that decides the cost.

• A full or blocked tank often causes slow drains and backups, and is fixed by pumping and clearing the outlet or baffle.
• A failing leach field shows up as wet ground, odors and green stripes, and the symptoms come back soon after a pump-out.

A good first step is to have the tank pumped and inspected. If the tank was the problem, you'll know quickly. If the symptoms return within weeks, the leach field is likely the issue. A repair or replacement usually needs a permit from your local health department. Our guide on how septic systems get approved in Connecticut explains that process.

What not to do

• Don't pour additives or chemicals in hoping to "fix" it. They don't repair a failed leach field.
• Don't drive or park on the leach field. Weight compacts the soil and can crush pipes.
• Don't run sump pumps or roof drains toward the system. Extra water makes a struggling field worse.

Keep it from happening

The EPA recommends that a typical household system be inspected at least every three years, with the tank usually pumped every three to five years. A few habits go a long way:

• Fix running toilets and leaky faucets. A single running toilet can waste up to 200 gallons a day.
• Spread laundry across the week instead of doing it all in one day.
• Only flush toilet paper. "Flushable" wipes, grease, coffee grounds and cat litter all cause trouble.
• Go easy on the garbage disposal, which adds solids to the tank.
• Plant only grass over the leach field. Tree and shrub roots get into pipes.

If you're seeing any of these signs, call us. We'll tell you honestly whether it's a simple fix or something bigger. Learn more about our septic repair and replacement work.