Sourced from EGLE Onsite Wastewater Program statements, the Michigan Local Public Health Accreditation Program, and county health department documentation — last checked August 2026.
Michigan Septic Guide — Free Tool
What Does Your Michigan County Require?
Michigan is the only state in the country without a statewide septic code. Instead, 45 local health departments write and enforce their own sanitary codes across 83 counties. That means there is genuinely no statewide answer to most septic questions here — your county’s code is the rule, and it can differ sharply from the county next door.
Directional guidance only. Michigan’s 45 local health departments each adopt and enforce their own sanitary code. EGLE’s Onsite Wastewater Program provides guidance and oversight but generally does not override local health department authority.
What Is Consistent Statewide
Despite the fragmentation, a common framework holds nearly everywhere.
Every county requires a permit before a new system goes in the ground.
The sequence is broadly the same: contact your local health department’s environmental health division, get a soil evaluation and site assessment, have a system designed based on those results, obtain the permit, install, and pass final inspection.
Soil evaluation is central everywhere. A sanitarian from the health department or a licensed evaluator digs test pits or takes soil borings to assess soil type, percolation rate, depth to bedrock, and depth to the water table.
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What Varies — and It’s a Lot
Timelines. One industry source describes the permit process taking around two weeks in one county and two months in another. If you’re working to a construction schedule, that’s not a detail.
Fees. Set independently by each health department.
Who may design and install. Wayne County requires pre-approved designers and installers. Many counties let you choose your own licensed contractor.
What happens when soil evaluation fails. Wayne County mandates holding tank alternatives for lots that fail. Other counties handle it differently, and some have fewer options.
Whether point-of-sale inspection is required. Entirely local. See our Time of Sale ordinance guide.
Counties Worth Knowing About
Wayne County has some of the strictest requirements in the state — pre-approved designers and installers, mandated holding tank alternatives where a lot fails soil evaluation, and higher fees than most counties.
Kent County processes high permit volume due to growth in the Grand Rapids metro area, and has streamlined its online application system.
Southeast Michigan generally contends with high water tables and clay soils that limit system options across the region.
County-specific details above come from industry sources rather than the county codes directly. Verify with the health department before relying on them.
How to Actually Get Your County’s Code
Call your local health department’s environmental health division and ask for a copy of the sanitary code, or a link to it. Many publish theirs online.
It’s worth doing even if you have no immediate project. The code tells you setback requirements, approved system types, tank sizing, and any maintenance obligations — the things people usually discover only when something goes wrong.
If Your Permit Is Denied
A denial usually follows a failed soil evaluation. You have more options than most people realize.
Ask exactly why it failed and by how much. Sometimes the gap is small enough that a different location on the property, or an alternative design, changes the answer.
Gather supporting documentation. An independent soil evaluation, or an alternative system design from a licensed engineer, often strengthens an appeal materially.
Escalate to EGLE if the local appeal fails. EGLE can review the decision and provide guidance. Be realistic though — EGLE generally does not override local health department authority in most cases. It’s a review, not usually a reversal.
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Frequently Asked Questions
How do I find my county septic rules in Michigan?
Call your local health department environmental health division and ask for a copy of the county sanitary code, or a link to it. Many publish theirs online.
What is consistent across Michigan counties?
Every county requires a permit before installing a new system, and the sequence is broadly the same — soil evaluation, design, permit, installation, final inspection.
What varies between Michigan counties?
Timelines, fees, whether pre-approved designers and installers are required, which system types are approved, what alternatives are allowed when soil evaluation fails, and whether point-of-sale inspection is required.
What can I do if my septic permit is denied?
Ask exactly why it failed, gather supporting documentation such as an independent soil evaluation or an engineered alternative design, and appeal locally. If that fails you can escalate to EGLE, though EGLE generally does not override local health department authority.