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In wastewater, solids capable of settling can restrict or block flow in sewer lines. A company or facility that discharges solids that causes a sewage backup is liable for any damages.

King County prohibits discharge of the following types of waste from all nondomestic sources:

  • materials such as ashes, sand, grass, and gravel
  • solid or viscous pollutants in amounts that will obstruct the flow in the collection system and/or treatment plant
  • Solid material, including food-grinder waste, which is not capable of passing through a 1/4-inch sieve.

King County has the following local limit for settleable solids:

  • Industrial wastewater must contain less than 7 milliliters per liter of solids capable of settling.
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