ZIP 98531 falls in Lewis County, Washington, where we hold 18,553 parcels measured as septic county-wide and 12,428 on sewer. We do not have a per-ZIP parcel count for this county, so this is the county total, not a count specific to ZIP 98531.
ZCTA 98531 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) |
|---|---|---|---|---|
| Lewis County, Washington | 79% | 206 | 18,553 | 12,428 |
| Thurston County, Washington | 21% | 26,354 | 28,502 | 60,687 |
6 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 |
|---|---|---|---|
| Goode & Associates | Centralia | (360) 736-5218 | — |
| Environmental Design, LLC | Centralia | (360) 219-3343 | — |
| Brad Davis Construction, Inc | Centralia | (360) 269-1111 | — |
| County Line Development LLC | Centralia | (360) 292-0909 | — |
| DJ's Plumbing | Centralia | (360) 508-0903 | — |
| Goebel Septic Service | Centralia | (360) 736-2167 | — |
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 hold 18,553 parcels measured as septic for Lewis County, Washington as a whole, not broken out by ZIP.
ZIP 98531 spans 2 counties: Lewis County, Washington, Thurston County, Washington.