California waste code 721 Liquid with 500 mg/L of arsenic or more.

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Based on California Title 22 and DTSC guidance
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Restricted wasteCalifornia restricted wastes
Restricted arsenic liquid

Liquid arsenic is 500 mg/L or more, so this restricted entry takes priority.

Restricted hazardous waste for liquids with arsenic at 500 mg/L or more. A result of exactly 500 mg/L is included.

Is California code 721 hazardous waste?

Not from the code alone. Code 721 is a restricted waste code, so it wins over any non-restricted code that also fits. Choose it after the hazardous waste determination. It doesn't prove the waste is hazardous or decide its federal RCRA status.

If a shipment needs the Uniform Hazardous Waste Manifest, enter 721 in Item 13 for its waste line. Use one California code, plus the federal RCRA codes when the waste is federally hazardous.

RCRA waste meets a federal listing or characteristic and has no federal exclusion. 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 record.

What does California code 721 cover?

This restricted entry is hazardous liquid with a representative arsenic result of 500 mg/L or more. A lower result isn't called nonhazardous, and lower metal-bearing aqueous waste can take another code.

Threshold: 500 mg/L or more in liquid
Official wording: 22 CCR division 4.5, chapter 11, Appendix XII(b)

Is arsenic liquid California code 721 or 132?

Code	When it fits
721	Representative arsenic is at least 500 mg/L in the liquid.
132	The aqueous liquid holds arsenic but stays below the restricted threshold.

The current Appendix XII threshold includes exactly 500 mg/L. DTSC's 2017 guidance says greater than 500 mg/L. If more than one restricted code fits, confirm the single California code for the waste line. The rules give no general tie-breaker.

Which wastes take California code 721?

Waste	When it’s 721
Arsenic-bearing waste	Liquid arsenic is at or above 500 mg/L

Which codes sit beside California code 721?

Code	What it is
711	Restricted cyanide liquid
722	Restricted cadmium liquid
723	Restricted hexavalent-chromium liquid
724	Restricted lead liquid
725	Restricted mercury liquid
726	Restricted nickel liquid
727	Restricted selenium liquid
728	Restricted thallium liquid