California waste code 172 Dust & machining waste from metalworking, with listed metals.

Free, no account
Based on California Title 22 and DTSC guidance
Nothing is stored

Inorganics
Metal dust and machining waste

Hazardous metal dust containing a metal listed in code 121, or hazardous machining waste.

Hazardous metal dust with a metal from code 121, plus hazardous machining waste. Metal-bearing sludge takes code 171.

Is California code 172 hazardous waste?

Not from the code alone. The material must first be determined hazardous. California code 172 is not restricted, and a restricted code takes priority over it. A non-restricted code doesn't make a waste non-hazardous.

If the shipment needs the Uniform Hazardous Waste Manifest, enter 172 in Item 13 for the waste line. Use one California code, plus any federal RCRA codes when the waste is federally hazardous.

Waste is RCRA waste when it meets a federal listing or characteristic and no federal exclusion applies. Non-RCRA waste is hazardous under California rules only. California presumes hazardous waste is RCRA unless the generator shows it isn't, so keep that determination.

What does California code 172 cover?

This is for hazardous metal dust holding a metal named under code 121, and for hazardous machining waste. The machining source counts as well as dust form. Metal-bearing sludge has its own code.

Rule: Appendix XII(b)
Official wording: 22 CCR division 4.5, chapter 11, Appendix XII(b)

Is metal dust or machining waste California code 172?

Code	When it fits
172	Metal dust holding a listed metal, or hazardous machining waste.
171	The hazardous sludge holds a metal listed under code 121.
181	The hazardous inorganic solid fits no named metal or other specific inorganic code.

Physical form and the machining source decide between dust and sludge. Metal content alone doesn't.

Which wastes take California code 172?

Waste	When it’s 172
Metal dust	Analysis finds a listed metal in dry particles.
Machining waste	The residue came from cutting, turning or another metal-machining operation.
Antimony-bearing waste	Antimony is in dry dust or machining residue.
Arsenic-bearing waste	Arsenic is in dry dust or machining residue.
Barium-bearing waste	Barium is in dry dust or machining residue.
Beryllium-bearing waste	Beryllium is in dry dust or machining residue.
Cadmium-bearing waste	Cadmium is in dry dust or machining residue.
Chromium-bearing waste	Chromium is in dry dust or machining residue.

Which codes sit beside California code 172?

Code	What it is
132	Metal-bearing water-based liquid
133	High-organic water-based liquid
134	Low-organic water-based liquid
135	Other water-based hazardous liquid
141	Unused inorganic material
151	Friable or powdered asbestos
161	Used oil-refinery cracking catalyst
162	Other used catalyst