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Public Health - Seattle & King County

Water, sewage and plumbing

Drinking water regulations and information
The primary goal of the Public Health Drinking Water Program is to prevent communicable disease and illness associated with drinking water from small public and individual private water systems.

Plumbing and gas piping regulations and permits
Learn how to get a homeowner's plumbing permit and gas piping permit.

Wastewater and septic tank regulations, inspections, and information
The Public Health Wastewater Program helps to ensure that over 115,000 septic systems including 192 septic systems in Seattle are safe. Septic systems treat wastewater when homes and buildings are not connected to public sewer systems.

As-built drawing search engine (a 'map' of your septic system)