ZIP 49318 falls in Muskegon County, Michigan. We have not measured septic data for this county yet. The county page below has what we do know: where records are kept and whether the portal is public.
ZCTA 49318 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) |
|---|---|---|---|---|
| Muskegon County, Michigan | 73% | — | — | — |
| Ottawa County, Michigan | 23% | 24 | 58,432 | 34,199 |
| Kent County, Michigan | 4% | 3 | 48,979 | 145,669 |
1 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 |
|---|---|---|---|
| Bob's Septic Service | Casnovia | (616) 887-8670 | — |
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 49318 spans 3 counties: Muskegon County, Michigan, Ottawa County, Michigan, Kent County, Michigan.