Septic System vs. Sanitary Sewer Service

Sanitary Sewer Service

Collects wastewater (sewage) from homes and businesses and delivers it to wastewater treatment plants through underground piping and pumping systems.

Septic System

A type of onsite wastewater treatment system (OWTS), consisting of a septic tank that collects all the (wastewater) sewage. The sewage separates into a solid (sludge) that settles to the bottom, and a liquid effluent that flows into a leach field for final treatment by the soil with its natural bacteria. There are different types of septic systems, as described by the EPA’s septic system glossary. Read more about septic systems on the EPA’s Septic Smart website.

The Wastewater Industry

To better explain sewer-related terms, such as tap and impact fees and wastewater treatment plant, we’ve created this Sewer Definitions page.

A conventional septic system treats (cleans) wastewater onsite, or within the soil on personal property. Typically, a [public] sewer system removes wastewater from a property through pipes and pumping systems.

Typical Septic System Illustration

Typical Gravity Sewer Diagram

Typical Pressurized Sewer Service with Grinder Pump Illustration