4 Listed Waste Categories under the U.S. EPA (Resource Conservation and Recovery Act - RCRA).
These are specific lists of materials that are automatically classified as hazardous waste simply because they appear on the list—regardless of whether they show dangerous characteristics like catching fire or corroding metal.
The 4 Categories
| Category | List Code | Source / Origin | Key Feature | Typical Examples |
|---|---|---|---|---|
| F-List | F001–F039 | Non-specific sources (common industrial processes) | Wastes from general manufacturing/operations (not unique to one industry) | Spent solvents (acetone, toluene), electroplating wastewater sludges, degreasing wastes |
| K-List | K001–K178 | Source-specific (particular industries/processes) | Tied to a single industry or production method | Wood preserving wastewater sludge (K001), petroleum refinery waste (K048–K052), steel production dust (K061) |
| P-List | P001–P205 | Unused commercial chemical products | Acutely hazardous – dangerous in very small amounts (≤ 1 kg triggers full regulation) | Sodium azide (P105), cyanides, arsenic trioxide (P012), nitroglycerin (P081) |
| U-List | U001–U411 | Unused commercial chemical products | Toxic – less acutely hazardous than P-list, but still automatically hazardous | Acetone (U002), benzene (U019), formaldehyde (U122), creosote (U051) |
Key Differences At A Glance
| F-List | K-List | P-List | U-List | |
|---|---|---|---|---|
| Material state | Used/spent waste | Used/spent waste | Unused commercial product | Unused commercial product |
| Hazard level | Varies | Varies | Acutely hazardous | Toxic (lower acute risk) |
| Quantity trigger | Any amount | Any amount | ≥ 1 kg triggers full rules | ≥ 25 kg triggers full rules |
| Industry specific? | No (common across industries) | Yes (tied to specific process) | No (anywhere chemical is discarded) | No (anywhere chemical is discarded) |
Why This Matters
If a waste is listed, it is hazardous by law—you do not need to test it for ignitability, corrosivity, reactivity, or toxicity. Your compliance obligations (storage, labeling, manifesting, disposal) begin immediately upon waste generation.
Example: Spent acetone from cleaning equipment is F003 (F-list). Unused, expired acetone discarded from a lab is U002 (U-list). Both are hazardous, but for different regulatory reasons.
Where To Find The Official Lists
40 CFR § 261.31 – F-list
40 CFR § 261.32 – K-list
40 CFR § 261.33(e) – P-list (acutely hazardous)
40 CFR § 261.33(f) – U-list (toxic)
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