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National Pollutant Discharge Elimination Systems (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 by placing limitations on the quantity of pollutants that may be discharged and to establish monitoring requirements and other conditions. Federal regulations, Ohio water quality standards and NPDES permits were written to protect public health and the aquatic environment.

NPDES General Permit for Household Sewage Treatment Systems

Starting January 1, 2017 the Ohio EPA established only one general NPDES permit OHK000003 for household sewage treatment systems (HSTS) that provide statewide coverage to authorize the discharge of approved sewage treatment systems from households.  From January 1, 2007 to January 1, 2017 there were two general permits but since the inception of the new statewide sewage treatment rule implementation on January 1, 2015, there was no longer a need for two permits.

A homeowner that installs a replacement discharging sewage treatment system, and in limited cases a new discharge on an existing lot, must register for coverage under the general permit by submitting a notice of intent to Ohio EPA along with a registration fee.  Certain conditions must be met for the property and discharge to qualify to legally receive NPDES permit coverage. These conditions are found under the "Limitations of Coverage" section of the permit.

Fill out and then print the current form of the Notice of IntentInstructions to fill out the Notice of Intent paperwork is located here

In 2010 the Ohio EPA initiated the process of renewing that HSTS General Permit and as part of the process, the Ohio EPA requested field sampling data as required by the permit and maintained by at local health districts as part of the operation and maintenance of the system. This data provides a basis to evaluate how the various HSTS were performing in the field, and to evaluate the performance of the local health districts to manage the program, and to obtain and maintain sample results from permitted discharging systems.  The summary of this data and report may be accessed in the following link at 2010 NPDES Sampling Report

Obtaining Permit Coverage - Information for Homeowners

To aid in the process of discovering what steps to take in the NPDES process, as well as NPDES system owner responsibilities, ODH has created a homeowner fact sheet that steps through the permitting and system selection process.  Your local health district  and the Ohio EPA, Division of Surface Water are also available for further assistance.

Approved Systems

The NPDES general permit for HSTS contains two sets of water quality standards that discharging sewage treatment systems must meet; one for discharge to Lake Erie and one for non-Lake Erie discharge. Manufacturers of HSTS seek recommendation for approval of pretreatment components and treatment trains through the Ohio Sewage Treatment System Technical Advisory Committee (TAC). One duty of the TAC is to review applications from manufacturers seeking approval of systems for use under this permit. If the proper criteria is met, the TAC will recommend approval of the system to the director of the Ohio Department of Health (ODH). Once a manufacturer and system are approved by ODH, the system information including schematics, installation and inspection checklists, and operation and maintenance manuals will be posted on this website within the "Systems and Components" page.

A comprehensive list of approved pre-treatment components and treatment trains is listed in the ODH column of the chart below. For a complete list of approved NPDES treatment systems click here.

updated 05/18/17