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Step 3: Is it Listed?

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The Dangerous Waste Regulations identify chemicals and specific waste streams as dangerous wastes. If you have a waste on the list, it’s a dangerous waste.

F Codes
F waste codes are the most common waste codes. They include spent solvents, like those that are dirty from cleaning or dissolving something. F codes also include several process wastes, like the wastes generated from cyanide-based electroplating. See the K and F lists in the regulations (WAC 173-303-9904).

K Codes
K waste codes are from specific industries or sources. You won’t have a K code unless you use a process described in the K list. Some examples are wastewater sludges from treatment processes or distillation bottoms. Industries on the K list include pulp and paper mills, wood preservation, iron and steel production, and a few others. See the K and F lists in the regulations (WAC 173-303-9904).

P and U Codes
Waste codes that begin with P or U are for discarded chemical products—unused, commercial products that become waste and contain only one active ingredient. P and U codes aren’t that common and mainly come from labs or medical facilities. See the P and U lists in the regulations (WAC 173-303-9903).

P codes: Acutely hazardous “P” listed chemicals are more toxic than U code wastes and are more stringently regulated.
U codes: “U” listed chemicals are less stringently regulated.

Contact a compliance specialist at your regional office with questions about designating or managing your dangerous waste.