Drain field in Kent County: what to know
The county's Table VI-A sets the minimum distances for a drain field or absorption bed: 10 feet from a basement wall, a property boundary, a water supply line or a swimming pool, and 50 feet from a lake, stream or river and from a potable well (75 feet for a Type II-B water supply). A seepage pit sits farther out: 25 feet from a basement wall, 100 feet from surface water and 75 feet from a well. The site needs soil that drains at 60 minutes per inch or faster, to a depth of at least 4 feet below the bottom of the field, and a water table that never rises within 2 feet of the ground surface. Slopes steeper than 20 degrees and ground that floods more often than once in ten years do not qualify, though the Health Officer may allow grading or fill.
EGLE adds the care points that hold everywhere: keep vehicles, dumpsters and heavy machinery off the system, keep walnut, maple, cottonwood, aspen and willow trees away, and direct downspouts away from it. Mound systems suit shallow soil, high groundwater or shallow bedrock, which EPA lists as the cases where a conventional field will not work, and the county's Well & Septic page links specifications for gravity and pressurized mounds, pump chambers and cutdown designs.
Permits for drain field in Kent County
The county health department issues the permit and inspects before the trench is covered.
Kent County Health Department, Environmental Health Division, 700 Fuller Ave NE, Grand Rapids; (616) 632-6900. A permit is needed to construct, repair, enlarge or relocate a system; it is valid two years unless extended and is not transferable as to holder or property. A city, village or township may not issue a building permit for a new structure needing a system until the sewage permit exists. The Kent County septic rules
Kent County septic fees
| Item | Amount | Note |
|---|---|---|
| Septic and well evaluation | $295 | County application form, 2025 |
| Septic evaluation, municipal water | $250 | Same form |
| Well evaluation, connected to sewer | $295 | Same form |
| Missed appointment | $75 | May be charged |
| Cancelled application, before field work | $50 | Processing fee |
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
Ask the county where your field lies, and whether a sewer line serves the street, before you plant or build.
- 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 Kent 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.