We have 94 parcels measured as septic in ZIP 99030 itself (Spokane County, Washington), out of 821 parcels in our records for this ZIP, of which 63 are recorded as on sewer.
| County | Land in this ZIP | Documents held | On septic (county) | On sewer (county) |
|---|---|---|---|---|
| Spokane County, Washington | 100% | 27 | 36,413 | 127,463 |
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 measured 94 parcels as septic in ZIP 99030 itself, out of 821 parcels in our records for this ZIP.
ZIP 99030 falls in Spokane County, Washington.