RCRA waste code for acid Strong acids with pH 2 or lower, or acids that eat steel.

Characteristic hazardous waste
Corrosive waste
An aqueous representative sample has pH 2 or lower, or the liquid corrodes steel at the federal test rate
When to use D002

F-listed waste
Spent cresol, cresylic acid and nitrobenzene solvents
When to use F004
F-listed waste
Wastewater sludge from electroplating
When to use F006
K-listed waste
By-product salts from making the herbicides MSMA and cacodylic acid
When to use K031
K-listed waste
Filter cake from making the insecticide phorate
When to use K039
K-listed waste
Spent acid pickling liquor from iron or steel finishing
When to use K062
K-listed waste
Air-pollution-control dust or sludge from secondary lead smelting
When to use K069
K-listed waste
Acid solution used to leach secondary lead-smelting dust
When to use K100
K-listed waste
Product-separation residue from making rocket-fuel chemical UDMH
When to use K107

Corrosive D002 hazardous waste. An acid liquid at pH 2 or lower, or one that corrodes steel at the federal test rate, takes D002.

Which RCRA code applies to acid waste?

Code	When it applies
D002	An aqueous representative sample has pH 2 or lower, or the liquid corrodes steel at the federal test rate

The spent sulfuric acid exclusion applies when the acid is used to produce virgin sulfuric acid and isn't speculatively accumulated.

Other spent-acid recycling doesn't remove D002 or a listing on its own.

Only recycling that makes virgin sulfuric acid, without speculative accumulation, is excluded.