In King County, Washington, which covers SeaTac, we have measured 84,437 parcels on septic and 486,662 on sewer. That is a county measurement. We do not hold a septic count for SeaTac on its own and this page does not estimate one.
SeaTac is a city in King County, Washington. The Census Bureau puts its internal point at 47.443403, -122.298287 and its land area at 10.06 square miles. Septic permitting and record keeping happen at the county level, not the city level, which is why every figure below is attributed to the county and linked back to the county page it came from.
| County | Records we hold | Parcels on septic | Parcels on sewer | County records portal | Searchable without an account |
|---|---|---|---|---|---|
| King County | 184,607 | 84,437 | 486,662 | county portal | no account needed |
King County, Washington is one of the more heavily documented counties in our collection: we hold 184,607 septic records for it, so the odds that a specific SeaTac address already has a filed document we can point you at are good. The county is predominantly sewered: only 84,437 of 571,099 classified parcels are on septic. Septic properties near SeaTac are the exception, which is exactly why owners often do not know they have one. The county publishes a records portal that we were able to search without creating an account, which makes checking a specific parcel something you can do yourself in a few minutes.
Septic is one subject with very different jobs inside it. These go straight to the page that does yours.
| If you are a | Go to | Because it covers |
|---|---|---|
| Homeowner | Septic pumping in SeaTac | keeping the system you have working |
| Buyer or seller | Buying or selling in SeaTac | what to pull and check before closing |
| Realtor | Buying or selling in SeaTac | the same records a seller needs on file |
| Designer or engineer | Septic design in SeaTac | design flow, tank capacity, dispersal sizing |
| Installer or contractor | Septic installation in SeaTac | site evaluation, permit sequence, inspection |
| Septic pumper | Septic pumping in SeaTac | tank access, lids and service interval |
| Inspector | Septic inspection in SeaTac | what gets checked and what a failure means |
| Land investor | Septic installation in SeaTac | whether raw land can take a system at all |
No. We measure septic and sewer at parcel level and roll it up by county. In King County, Washington, which covers SeaTac, we have measured 84,437 parcels on septic and 486,662 on sewer. That is a county measurement. We do not hold a septic count for SeaTac on its own and this page does not estimate one.
SeaTac is in King County, Washington.
From the Census ZCTA-to-place relationship file, with the share of SeaTac’s land area that falls in each. A ZIP is not a place boundary and the two only ever partly agree, which is exactly why both pages exist.
Straight-line distance from the Census internal point of SeaTac.
Parcel Perfect generates a code-shaped septic design and as-built style drawing for a parcel from the records and site data we hold, and shows every parcel we have classified as septic or sewer on one map. Both are open to use for any parcel in King County, Washington.