Septic records › Washington

Septic systems in ZIP 99018

We have 50 parcels measured as septic in ZIP 99018 itself (Spokane County, Washington), out of 267 parcels in our records for this ZIP.

50
septic parcels in this ZIP
267
total parcels in this ZIP

Where the records are kept

CountyLand in this ZIPDocuments heldOn septic (county)On sewer (county)
Spokane County, Washington100%2736,413127,463

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.

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Common questions

How many properties in ZIP 99018 are on septic?

We have measured 50 parcels as septic in ZIP 99018 itself, out of 267 parcels in our records for this ZIP.

What county is ZIP 99018 in?

ZIP 99018 falls in Spokane County, Washington.