ZIP 98579 falls in Thurston County, Washington, where we hold 28,502 parcels measured as septic county-wide and 60,687 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 98579.
ZCTA 98579 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) |
|---|---|---|---|---|
| Thurston County, Washington | 59% | 26,354 | 28,502 | 60,687 |
| Lewis County, Washington | 41% | 206 | 18,553 | 12,428 |
| Grays Harbor County, Washington | 0% | — | 10,331 | 20,468 |
3 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 |
|---|---|---|---|
| EnviroTech Septic Solutions | Rochester | (360) 273-3840 | — |
| Dependable Excavation Plus | Rochester | (360) 277-6709 | — |
| EnviroTech | Rochester | (360) 273-3840 | — |
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 28,502 parcels measured as septic for Thurston County, Washington as a whole, not broken out by ZIP.
ZIP 98579 spans 3 counties: Thurston County, Washington, Lewis County, Washington, Grays Harbor County, Washington.