California waste code 791 Acid liquid at pH 2 or below, with no listed metals.

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

Liquid pH is 2 or below and no code 121 metal is part of the description.

Restricted liquid at pH 2 or below. With a code 121 metal in it, the waste takes code 792 instead.

Is California code 791 hazardous waste?

Not from the code alone. Code 791 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 791 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 791 cover?

This restricted entry is hazardous liquid measured at pH 2 or below with none of the metals listed under code 121 present. It is a California code choice. Federal corrosivity and exclusions still need their own determination.

Threshold: pH 2 or below
Official wording: 22 CCR division 4.5, chapter 11, Appendix XII(b)

Is acidic liquid California code 791 or 792?

Code	When it fits
791	Measured pH is 2 or below and no code 121 metal is present.
792	Measured pH is 2 or below and a code 121 metal is present.

The current Appendix XII threshold includes pH 2. DTSC's 2017 guidance says pH below 2, which leaves out the boundary. 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 791?

Waste	When it’s 791
Strong acidic liquid	The liquid has pH 2 or below and no code 121 metal

Which codes sit beside California code 791?

Code	What it is
725	Restricted mercury liquid
726	Restricted nickel liquid
727	Restricted selenium liquid
728	Restricted thallium liquid
731	Restricted PCB liquid
741	Restricted halogenated-organic liquid
751	Restricted halogenated-organic solids or sludge
801	Waste that may contain dioxins