Clear, practical septic information

Septic systems collect and treat household wastewater on your property. A little knowledge can help you care for the system, notice changes, and know when to call for help.

How a Septic System Works

A conventional home septic system has two main parts: a septic tank and a drainfield. Wastewater flows into the tank, where heavier solids settle and oils and grease rise to the top. The liquid between these layers flows to the drainfield.

In a conventional drainfield, pipes distribute the liquid into the soil for further treatment. Some systems use different designs. Learn more about how a septic drainfield works.

Featured septic guides

Septic System Maintenance Checklist

Review everyday care, inspections, pumping, water use, and drainfield protection in one homeowner checklist.

Signs Your Septic System May Be Failing

Learn what slow drains, gurgling, odors, wet ground, or wastewater backups may mean, and what to do next.

Septic Tank Backup: What to Do

Find practical first steps for a backup, including reducing water use and keeping people away from sewage.

Septic Water Quality: Protect Your Well and Groundwater

Learn how septic systems can affect private wells and groundwater, plus testing and prevention steps.

START HERE

New to septic systems? Start with how a septic drainfield works and see how it fits into the treatment process.

Planning routine care? Read how often to pump a septic tank. The right schedule depends on your system and household.

Is your septic alarm sounding? Follow the safe first steps in our guide to a septic tank alarm.

When to contact a professional

Some symptoms have more than one possible cause. Contact a qualified septic professional if you notice several slow drains, a sewage backup, persistent sewage odors, standing wastewater near the system, or an alarm that will not clear.

If sewage is backing up into your home or surfacing in the yard, reduce water use and keep children and pets away from the affected area. Do not open or enter a septic tank. Follow advice from a qualified professional or your local health department.

A note about inspections and pumping

The U.S. Environmental Protection Agency says a typical household septic system should be inspected by a service professional at least every three years. Household tanks are commonly pumped every three to five years. Systems with pumps, electrical float switches, or mechanical parts generally need yearly inspections. Your system, household use, and local rules may call for a different schedule. See the EPA’s septic system care guidance for details.

About this site

Septic Tank & Treatment shares general educational information for homeowners. Articles can help you understand common topics and prepare questions, but they cannot inspect or diagnose a specific system. Septic designs and local requirements vary, so contact a qualified professional or local health department for advice about your property.

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