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Information for Soil Professionals & STS Designers

Soils, Designs and Site Drainage

An accurate soil evaluation is critical information to determine sewage treatment system (STS) design options for a property. This page provides information on Soil Evaluator (Soil Scientist), STS Designers and Site Drainage Resources.  This information is found here

National Pollutant Discharge Elimination System (NPDES) Overview

A discharging sewage treatment systems treats and then discharges treated effluent to a stream, ditch or other surface water body.  An National Pollutant Discharge Elimination Systems (NPDES) permit must be obtained from the Ohio Environmental Protection Agency (Ohio EPA) Division of Surface Water whenever there is a discharge of treated or partially treated water to a surface water of the State. NPDES permits exist to regulate wastewater discharges. Additional Information on NPDES is located here.

Approved Sewage Treatment Products since 2007

Manufacturers provide system specific operations and maintenance manuals which outline the requirements for that specific system. This information can be found on the Approved Sewage Product  page.

Types of STS Components, System Types and Maintenance of each system type.

This page is a basic overview of the STS (Sewage Treatment System) components, system types and system maintenance of each type of system  This information is found here.