As of January 1st, 2020, the Ohio Department of Health’s new Sewage Treatment System Rules went into effect.
Anyone planning on purchasing a lot, or building on a lot, should have the site evaluated early in the process. Sewage system designs are based on site specific soil characteristics to protect ground and surface water resources, protect residents from exposure to sewage-borne disease, and reduce system failure in the future. The size, design, and cost of installing a sewage treatment system vary depending on depth to seasonal water table or bedrock, slope, soil texture, and permeability. Not all lots can be developed and served by an on-lot sewage treatment system. Limiting factors like flood plains, saturated soils, excessive slopes can make system design impossible or impractical.
A complete Building Site Evaluation Application including all supplemental documentation must be submitted prior to a site inspection. We recommend you contact the Health Department to discuss the building application process and requirements.
A Small Flow On-Site Sewage Treatment System is a system other than a household sewage treatment system, that treats not more than 1,000 gallons of sewage per day. The system also must not require a national pollutant discharge elimination system (NPDES) permit issued under ORC section 6111.03. Examples of SFOSTS are: Vacation rental cabins, a dwelling and an ancillary building both served by an SFOSTS where the ancillary building may be open to the public and is used by more than the residents of the dwelling, two dwellings, including arrangements such as a dwelling and a detached garage with living space, and a dwelling with a home business that may be open to the public and generates sewage in excess of the daily design flow or waste strength for an HSTS, and has no wastewater other than sewage going to the SFOSTS. See the Small Flow Evaluation Application for existing systems or the Site Evaluation for Small Flows for new systems or contact the Health Department with more questions.
If splitting off land, and any portion is going to be less than 20 acres, the Health Department must evaluate the well and septic systems on the property prior to plat approval. More information is in the Landsplit Application. If you are splitting off a non-buildable lot, please use the Land Survey Evaluation. Contact the Health Department during normal business hours for more questions at 937-548-4196.
Questions regarding Planning Commission may be directed to Curtis Yount at 937-547-7381.
If requested, the Darke County Health Department will inspect the septic system and well of a property. It is not a requirement by the Health Department to have the system inspected; however, many lending institutions require such an inspection. If you are completing an inspection through the Health Department, then you must fulfill all requirements of the Health Department.
To find out more about the requirements of a home sale/refinance inspection, please see the Home Sale & Refinance Application or contact the Health Department during normal business hours.
If you are adding onto or remodeling your home you may be required to complete a septic inspection prior to obtaining your building permit. If the addition involves a bedroom, bathroom or anything that requires a plumbing permit, you are required to have the septic system evaluated.
To find out more about the requirements of the room addition/remodel inspection, please see the Home Remodel Application or contact the Health Department during normal business hours.
Existing Homes with existing systems: If you are adding on or placing a new home on your existing lot, you may need to have your septic system evaluated to determine if it is an adequate size and working properly. If you are experiencing trouble with an existing system, it may be necessary to evaluate the system to determine what corrective action may be needed. The Health Department has sewage records for existing systems since 1953 and are able to provide a copy to the homeowner. You may fill out the Sewage Repair Replacement Application to have your system evaluated.
More Information on Sewage Treatment Systems: