Property records · Seattle and Tacoma

Is This House on Sewer or Septic? Check by Address

Enter a property address to get the official routes for checking a sewer connection and an older septic file. This pilot covers Seattle and Tacoma city addresses.

Start with the building you are checking. A nearby sewer main can show where service is available. The building’s connection record or the utility can tell you whether it is connected.

Official sources by city

Seattle, WA

Building connection evidence: Seattle Side Sewer Cards and Maps ↗. Search the house number and street. Open the exact parcel card and look for a sanitary connection for the building. Check its date and whether the card shows drainage only.
Public sewer availability: Seattle Public Utilities sewer maps ↗. Check mapped infrastructure and ask the utility whether service is active at the address.
Older septic evidence: King County septic record drawings ↗. Look up the same property and compare the drawing date with any later sewer connection or abandonment record.

Tacoma, WA

Building connection evidence: Tacoma permit and DART search instructions ↗. Search by site address and parcel number. Look for a side sewer inspection card or completed connection record. Older permits may be in a different archive.
Public sewer availability: Tacoma sewer availability guidance ↗. Use the city’s address or parcel route to check proximity and ask Environmental Services about service at the property.
Older septic evidence: Tacoma–Pierce County Health document search ↗. Open the matching septic record drawing, then check city records for a later conversion.

How to read the evidence

Does a sewer line in my street mean the building is connected?

A nearby main indicates infrastructure. Look for the exact building’s sanitary side sewer or completed connection file, then confirm active service with the utility.

What if a septic drawing and a sewer record both exist?

Match both to the property and compare their dates. Ask the utility to confirm active service and look for a dated septic abandonment record.

Sources reviewed 2026-11-05.

Other Washington septic records routes →