ZIP 48189 falls in Washtenaw County, Michigan, where we hold 11,810 septic-related documents. We have not classified septic-versus-sewer status for this county, and we do not have a per-ZIP parcel count -- see the county page for what we hold and where the records are kept.
ZCTA 48189 is not entirely inside one county. Land-area share is from the 2020 Census ZCTA-to-county relationship file.
| County | Land in this ZIP | Documents held | On septic (county) | On sewer (county) |
|---|---|---|---|---|
| Washtenaw County, Michigan | 70% | 11,810 | — | — |
| Livingston County, Michigan | 30% | — | — | — |
2 businesses on record with an address in this ZIP: pumping, installation, design, inspection and repair. Not an endorsement, and we take no fee.
| Company | City | Phone | Rating |
|---|---|---|---|
| Bolton Septic | Whitmore Lake | (248) 852-0440 | 5.0 (7) |
| Golden Septic Systems & Landscape Supplies | Whitmore Lake | (810) 231-3131 | — |
Land-area overlap is from the 2020 Census Bureau ZCTA5-to-county relationship file, not an estimate of ours. Parcel and document counts are rows we hold, not a survey of every property in the ZIP. Last verified 2026-09-01.
We have not measured septic-versus-sewer status for this county yet.
ZIP 48189 spans 2 counties: Washtenaw County, Michigan, Livingston County, Michigan.