King County local discharge limits: settleable solids and food waste

King County prohibits discharge to the sewer of materials such as ashes, sand, grass, and gravel.

The limits:

• Industrial wastewater must contain less than 7 milliliters per liter of solids capable of settling.
• Food waste, including food-grinder waste, must be capable of passing through a 1/4-inch sieve.

Settleable solids: 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.