Mercer County, OH septic permits and regulations
Septic systems in Mercer County, Ohio are permitted by Mercer County Health District under OAC 3701-29.
Septic permit program
- Program type: County Health Department
- Authorized agent: Mercer County General Health District
- Own septic program: No, uses Ohio state rules
- Local rules beyond the state: No
- Population: 42,528
Permit fee comparison
Average septic permit fee in Mercer County: $55. Ohio average: $144.
Local rules
County operates under state-level OAC Chapter 3701-29 (Sewage Treatment Systems). Contact local health department for any additional county-specific requirements.
What SepticPro has on file for Mercer County
- 2 permit fees with sources
- The agency phone, email and office address
- Setback distances
- Soil and perc test requirements
- Allowed system types
- System design rules
- Inspection requirements
- Maintenance and pumping rules
- Point-of-sale rules
- Installer, designer and pumper licensing
Create a free account to see the full details.
Draw a permit-ready site plan for Mercer County
Enter the address, draw the system on the aerial with the parcel lines and topo, and print it to scale for Mercer County Health District. See how SepticPro site plans work.
Other Ohio counties
- Adams County
- Allen County
- Ashland County
- Ashtabula County
- Athens County
- Auglaize County
- Belmont County
- Brown County
- Butler County
- Carroll County
- Champaign County
- Clark County
- Clermont County
- Clinton County
- Columbiana County
- Coshocton County
- Crawford County
- Cuyahoga County
- Darke County
- Defiance County
- Delaware County
- Erie County
- Fairfield County
- Fayette County
Data checked 2026-03-16. Always confirm requirements with Mercer County Health District before applying.