Drain field in Wayne County: what to know
The state Criteria are the floor in Wayne County: at least 4 feet between the bottom of the trench or bed and the high groundwater, a percolation rate of 45 minutes per inch or faster, and absorption systems 10 feet from property lines and 15 feet from foundations. Wayne's sanitary code can be stricter, so treat these as minimums.
A new field starts with a site evaluation, $300 on the county's 2024 schedule, and then a permit at $471, with $325 for a repair. The county page says the permit is valid for one year and every completed system must be inspected and approved by the health department; confirm that with the department before you plan around it. Dig nothing before the MISS DIG ticket, which the county page also asks for.
Permits for drain field in Wayne County
The county health department issues the permit and inspects before the trench is covered.
Wayne County Environmental Health (Public Health), Wayne, Michigan. A valid permit comes before installation; the county asks for a form, proof of a street address, the 10-digit parcel ID, a survey and legal description for new construction, a plot plan and fees. Permits last one year, per the county's page; confirm with the department. The Wayne County septic rules
Wayne County septic fees
| Item | Amount | Note |
|---|---|---|
| Site evaluation, under 1,000 gal/day | $300 | Schedule effective Jan 16, 2024 |
| Septic permit, under 1,000 gal/day | $471 | Same schedule |
| Septic repair permit | $325 | Same schedule |
| Health department sale evaluation | $358 | Same schedule |
| "Transfer evaluation" (the schedule does not explain the term) | $161 | Same schedule |
When a drain field problem cannot wait
- Sewage is surfacing in the yard or backing up inside.
- The field is wet and foul after a flood: keep people and vehicles off it.
- A bright green strip over the field with no surfacing or backup: book an inspection soon.
- A tree near the field: plan its removal, because EGLE links roots to failure.
Before you call
Request the as-built drawing from the county first, since it shows where the field lies before anyone excavates.
- Keep vehicles and heavy items off the field and mark its edges.
- Point downspouts and sump discharge away from it, and fix leaking fixtures.
- Note where the wet spot is, when it appears and whether it follows rain.
- Ask the county for the as-built drawing, which shows where the field lies.
What drain field costs
The estimate below is the Michigan-wide one and not a Wayne County price. The same table is on the drain field page. How we estimate costs. Prices as of Oct 19, 2026.
| Item | Figure | What it is |
|---|---|---|
| Estimated range, not a quote | $890 to $6,025 per repair | Built from one national published range, adjusted by the Michigan operating engineer median wage ratio (1.05). No Michigan septic company published a range we could count. |
| Estimated range for a full drain field replacement, not a quote | $2,675 to $18,100 per replacement | Built from one national published range, adjusted by the Michigan operating engineer median wage ratio (1.05). No Michigan septic company published a range we could count. |
| Septic tank servicer wage, Michigan mean | $24.85 an hour | What Michigan septic tank servicers are paid (BLS, May 2025, statewide), not what you are charged. |
| Repair or replace a malfunctioning conventional system (U.S. EPA) | $5,000 to $15,000 | EPA's national range, undated. Alternative systems cost more, and EPA gives no figure for them. |
| Replacement septic system (Michigan EGLE) | $8,000 to $30,000 | From EGLE's July 2025 news release on septic loans. EGLE gives no source or date for the range. |
How we estimate costs: the Estimated range row is a model, not a quote. It takes one published national range for this job (a cost guide from a third-party site that we have not verified and do not cite) and multiplies it by Michigan's operating engineer median wage ratio to the US (1.05, BLS 2025 data). No permit or evaluation fee is added: the county rows are shown as the schedules print them. The wage and fee rows are what workers are paid and what a county charges, and neither is a price you will be quoted. We have not collected Michigan septic quotes, and one company's published pumping price is not a range. Your tank, soil and site move a real quote outside any range, so get written quotes. Full method.
Questions about drain field
What causes a septic drain field to fail?
Solids, roots, excess water and age, according to EGLE and EPA. EGLE calls root intrusion one of the leading causes of failure in Michigan, and EPA says a field over 25 to 30 years old can develop a thickened biomat.
Can a drain field be repaired?
Sometimes, but significant root intrusion or a clogged field can require replacing the field. Both EGLE and EPA say so. A county permit comes first.
How far must a drain field be from a well in Michigan?
The state well code sets 50 feet for a single-family well, and some county codes require more. Genesee County requires 200 feet to Type I and IIa wells, and Saginaw County requires 100 feet to a shallow well.