California waste code 131 Water with cyanide, sulfide, chlorate or similar, at pH 2 to 12.5.

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Based on California Title 22 and DTSC guidance
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Inorganics
Reactive-anion water-based liquid

The liquid has pH above 2 and below 12.5 and contains one of the nine listed reactive anions.

Water-based liquid at pH 2 to 12.5 with a reactive anion such as azide, cyanide, chlorate, nitrite or sulfide.

Is California code 131 hazardous waste?

Not from the code alone. The material must first be determined hazardous. California code 131 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 131 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 131 cover?

This is for hazardous aqueous solution with a pH above 2 and below 12.5. It must hold at least one of the listed reactive anions, which are cyanide, azide, sulfide, bromate, chlorate, fluoride, hypochlorite, nitrite and perchlorate. Composition and pH both set the scope.

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

Is a reactive-anion solution California code 131?

Code	When it fits
131	A listed reactive anion is present, the pH is above 2 but below 12.5, and no restricted code applies.
711	The hazardous liquid holds at least 1,000 mg/L total cyanide.
791	The liquid has a pH of 2 or below and no code 121 metal.
792	The liquid has a pH of 2 or below and holds a code 121 metal.
135	No specific alkaline, reactive-anion, metal or organic-residue liquid code fits.

A hazardous water-based liquid isn't 131 from reactivity alone, because the listed anion and the measured pH decide it. Cyanide at 1,000 mg/L or more takes restricted code 711, even within this pH range.

Which wastes take California code 131?

Waste	When it’s 131
Azide solution	Azide is present and the water-based liquid has a pH above 2 and below 12.5.
Bromate solution	Bromate is present and the water-based liquid has a pH above 2 and below 12.5.
Chlorate solution	Chlorate is present and the water-based liquid has a pH above 2 and below 12.5.
Cyanide solution	Cyanide is below 1,000 mg/L and the water-based liquid has a pH above 2 and below 12.5.
Fluoride solution	Fluoride is present and the water-based liquid has a pH above 2 and below 12.5.
Hypochlorite solution	Hypochlorite is present and the water-based liquid has a pH above 2 and below 12.5.
Nitrite solution	Nitrite is present and the water-based liquid has a pH above 2 and below 12.5.
Perchlorate solution	Perchlorate is present and the water-based liquid has a pH above 2 and below 12.5.

Which codes sit beside California code 131?

Code	What it is
121	Alkaline liquid with listed metals
122	Alkaline liquid without listed metals
123	Other alkaline liquid
132	Metal-bearing water-based liquid
133	High-organic water-based liquid
134	Low-organic water-based liquid
141	Unused inorganic material
151	Friable or powdered asbestos