How to read the sheets

The numbered grid helps you find a sheet. It does not draw a boundary, so use your own bills and the official maps to settle which office serves your address.

The grid

Each square is a sheet, placed roughly where that place sits around the water. Blue is water and the amber bars are bridges. It isn't to scale, and a house near an edge could fall under either sheet.

The key letters

• W: who supplies drinking water.
• S: who runs the public sewer.
• T: who regulates septic tanks.
• P: who issues plumbing permits.
• L: who certifies plumbers, the same on every sheet.

Settling your own address

• Your water bill names your supplier. On the peninsulas it may be a small system with a name you have never seen elsewhere, which is why finding your water supplier has its own page.
• Your sewer bill, or the lack of one, is the first clue to sewer or septic.
• The county's public parcel map shows whether you sit in a city or on unincorporated land, which tells you which permit office to ask.

Source notes

Every sheet ends with its sources. "Checked" means the page was opened on that date. "Seen only as a search summary" means the official site wouldn't open from here, so the fact came from a search listing of that page. Treat those with extra care, and confirm with the office.