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Small Flow On-site Sewage Treatment Systems (SFOSTS)

The small flow on-site sewage treatment system (SFOSTS) is a new category of sewage treatment system (STS) established by Chapter 3718 of the Ohio Revised Code.  Under the provisions of this law and rule of the Ohio Administrative Code (OAC) Chapter 3701-29, local boards of health may choose to assume authority for SFOSTS and in doing so must regulate SFOSTS permitted under their authority in accordance with the STS rules (OAC Chapter 3701-29) governing both household sewage treatment systems (HSTS) and SFOSTS. 

Fact Sheet on SFOSTS – Change of Authority Issues:

In jurisdictions where a local board of health does not assume SFOSTS authority
, the Ohio Environmental Protection Agency (OEPA) will continue to have authority for these systems as well as all other wastewater systems except HSTS.  The following fact sheet provides information on the transition of authority from OEPA in cases where SFOSTS authority is assumed by local boards of health.  The table referenced in the fact sheet is also provided.


ODH/OEPA Fact Sheet on SFOSTS-Change of Authority Issues


SFOSTS Design Flow and Waste Strength-Table A-1


List of local health districts that have SFOSTS authority

(RRRR) Definition of SFOSTS – OAC Rule 3701-29-01

“Small flow on-site sewage treatment system” or “SFOSTS” means a system, other than a household sewage treatment system that treats not more than one thousand gallons of sewage per day and that does not require a national pollutant discharge elimination system permit issued under section 6111.03 of the Revised Code or an injection well drilling or operating permit issued under section 6111.043 of the Revised Code. For the purposes of this chapter, structures that are served by a small flow on-site sewage treatment system shall also include:

(1) More than one dwelling or arrangements such as a dwelling and a detached garage with living space.

(2) More than one vacation rental cabin.

(3) A dwelling and related structure, such as a barn or personal garage, when the structure is used by persons other than, or in addition to the residents of the dwelling.

(4) A dwelling with a home business when the nature of the home business is such that it produces sewage, including but not limited to, home businesses that provide a public restroom for use by nonresidents.

last updated 05/18/18