Mercer County, IL septic permits and regulations
Septic systems in Mercer County, Illinois are permitted by Mercer County Health Department under 77 Ill. Admin. Code Part 905.
Septic permit program
- Program type: County Health Department
- Authorized agent: Mercer County County Health Department
- Own septic program: No, uses Illinois state rules
- Local rules beyond the state: No
- Population: 15,699
Permit fee comparison
Average septic permit fee in Mercer County: $175. Illinois average: $183.
Local rules
County operates under state-level 77 Ill. Admin. Code Part 905 (Private Sewage Disposal Code). Contact local health department for any additional county-specific requirements.
What SepticPro has on file for Mercer County
- 13 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 Department. See how SepticPro site plans work.
Other Illinois counties
- Adams County
- Alexander County
- Bond County
- Boone County
- Brown County
- Bureau County
- Calhoun County
- Carroll County
- Cass County
- Champaign County
- Christian County
- Clark County
- Clay County
- Clinton County
- Coles County
- Cook County
- Crawford County
- Cumberland County
- De Witt County
- DeKalb County
- Douglas County
- DuPage County
- Edgar County
- Edwards County
Data checked 2026-03-16. Always confirm requirements with Mercer County Health Department before applying.