Genesee County, Michigan septic permits and requirements

Permitting authority

Genesee County Health Department — Environmental Health Division / Wells and Septic Program

Genesee County Health Department Environmental Health Division, 324 S. Saginaw St., Suite 6, Flint, MI 48502; 810-257-3603; [email protected].

Michigan onsite-wastewater framework

Michigan EGLE states that onsite wastewater management is a required local-health-department service under the Michigan Public Health Code. Local health departments carry out ordinary onsite permitting and review while EGLE provides oversight, technical support, and review for certain larger or specialized systems.

Confirm project scope before construction

Local sanitary codes, sewer availability, wastewater flow, commercial use, property additions, replacement work, and alternative or engineered systems can change the approval path. Use the current county instructions and any applicable EGLE review before excavation or installation.

County Health Department issues onsite sewage permits under local regulations

Genesee County’s current Environmental Health materials identify septic permitting, soil evaluations, onsite inspections, engineered-plan review, and enforcement as Health Department functions. The county’s construction standard states that systems approved under Chapter VI of the Genesee County Environmental Health Regulations must meet the county construction criteria.

Michigan EGLE retains direct oversight for Genesee County

Michigan EGLE’s current onsite-program contact page marks Genesee as a direct-oversight county. That state oversight does not replace the county permit process documented by the Genesee County Health Department; applicants should follow county permitting and any additional EGLE review that applies to the project.

Replacement work requires a permit before a county-licensed installer works

Genesee County’s 2025 replacement instructions state that a failing septic field and/or tank requires a replacement permit. The county evaluates the site and requires a permit before a licensed septic installer performs the work; septic installers must be licensed with Genesee County.

Sewer availability can prevent a replacement septic permit

Genesee County instructs applicants to check municipal sewer availability before applying for a replacement permit because a municipality may require sewer connection instead of septic replacement. The Health Department states it will deny the septic application when municipal sewer connection is required.

Permits expire after twelve months

The Genesee County Environmental Health Regulations state that onsite sewage permits become void twelve months from issuance. Renewal is possible but is subject to intervening regulatory changes.

Inspection is required before covering or placing the system in operation

County regulations require inspection after construction is complete and before any portion of the sewage-disposal system is covered or placed in operation. Final approval may be denied when the installation does not meet permit conditions or applicable standards.

Some sites require engineered design

Genesee County’s replacement instructions state that denied lots and commercial properties require engineered systems and that lots under one acre may require engineered design. The construction standard also allows the Health Officer to require professionally prepared plans when site conditions call for a unique design.

Official sources

SepticScope summarizes public-agency information for planning purposes. The permitting agency's current instructions control if they differ from this guide.

Report outdated county information

Septic rules, forms and agency pages can change. If you find a broken official link or a county requirement that has changed, send SepticScope feedback and include the current local government source.