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InstituteHazardous WasteWaste IdentificationWaste/HazWasteIncompatible WastesEnvironmental EdgeWasteWaste ManagementEnvironmentalChartsEnglishAnalysisFocus AreaUSA

Lists of Potentially Incompatible Wastes

Appendix V to 40 CFR 265 lists examples of incompatible wastes as well as the potential consequences of mixing them. Note that the lists in this table do not cover every waste or every situation! Owners and operators must properly analyze and identify hazardous wastes at facilities to avoid creating hazards to employees and the environment.

In the lists below, the mixing of a Group A material with a Group B material may have the potential consequences noted at the bottom of each list.

Federal regulatory citations:

40 CFR 265, Appendix V to Part 265

Group 1-AGroup 1-B
Acetylene sludgeAcid sludge
Alkaline caustic liquidsAcid and water
Alkaline cleanerBattery acid
Alkaline corrosive liquidsChemical cleaners
Alkaline corrosive battery fluidElectrolyte, acid
Caustic wastewaterEtching acid liquid or solvent
Lime sludge and other corrosive alkalies
Lime wastewaterPickling liquor and other corrosive acids
Lime and waterSpent acid
Spent causticSpent mixed acid
Spent sulfuric acid
Potential consequences: Heat generation; violent reaction.
Group 2-AGroup 2-B
AluminumAny waste in Group 1-A or 1-B
Beryllium
Calcium
Lithium
Magnesium
Potassium
Sodium
Zinc powder
Other reactive metals and metal hydrides
Potential consequences: Fire or explosion; generation of flammable hydrogen gas.
Group 3-AGroup 3-B
AlcoholsAny concentrated waste in Groups 1-A or 1-B
WaterCalcium
Lithium
Metal hydrides
Potassium
SO2Cl2, SOCl2, PCl3, CH3SiCl3
Other water-reactive waste
Potential consequences: Fire, explosion, or heat generation; generation of flammable or toxic gases.
Group 4-AGroup 4-B
AlcoholsConcentrated Group 1-A or 1-B wastes
AldehydesGroup 2-A wastes
Halogenated hydrocarbons
Nitrated hydrocarbons
Unsaturated hydrocarbons
Other reactive organic compounds and solvents
Potential consequences: Fire, explosion, or violent reaction.
Group 5-AGroup 5-B
Spent cyanide and sulfide solutionsGroup 1-B wastes
Potential consequences: Generation of toxic hydrogen cyanide or hydrogen sulfide gas.
Group 6-AGroup 6-B
ChloratesAcetic acid and other organic acids
ChlorineConcentrated mineral acids
ChloritesGroup 2-A wastes
Chromic acidGroup 4-A wastes
HyphochloritesOther flammable and combustible wastes
Nitrates
Nitric acid, fuming
Perchlorates
Permanganates
Peroxides
Other strong oxidizers
Potential consequences: Fire, explosion, or violent reaction.
waste
Waste
ENVIRONMENTAL EDGE

Appendix V to 40 CFR 265 lists examples of incompatible wastes as well as the potential consequences of mixing them. Note that the lists in this table do not cover every waste or every situation! Owners and operators must properly analyze and identify hazardous wastes at facilities to avoid creating hazards to employees and the environment.

In the lists below, the mixing of a Group A material with a Group B material may have the potential consequences noted at the bottom of each list.

Federal regulatory citations:

40 CFR 265, Appendix V to Part 265

Group 1-AGroup 1-B
Acetylene sludgeAcid sludge
Alkaline caustic liquidsAcid and water
Alkaline cleanerBattery acid
Alkaline corrosive liquidsChemical cleaners
Alkaline corrosive battery fluidElectrolyte, acid
Caustic wastewaterEtching acid liquid or solvent
Lime sludge and other corrosive alkalies
Lime wastewaterPickling liquor and other corrosive acids
Lime and waterSpent acid
Spent causticSpent mixed acid
Spent sulfuric acid
Potential consequences: Heat generation; violent reaction.
Group 2-AGroup 2-B
AluminumAny waste in Group 1-A or 1-B
Beryllium
Calcium
Lithium
Magnesium
Potassium
Sodium
Zinc powder
Other reactive metals and metal hydrides
Potential consequences: Fire or explosion; generation of flammable hydrogen gas.
Group 3-AGroup 3-B
AlcoholsAny concentrated waste in Groups 1-A or 1-B
WaterCalcium
Lithium
Metal hydrides
Potassium
SO2Cl2, SOCl2, PCl3, CH3SiCl3
Other water-reactive waste
Potential consequences: Fire, explosion, or heat generation; generation of flammable or toxic gases.
Group 4-AGroup 4-B
AlcoholsConcentrated Group 1-A or 1-B wastes
AldehydesGroup 2-A wastes
Halogenated hydrocarbons
Nitrated hydrocarbons
Unsaturated hydrocarbons
Other reactive organic compounds and solvents
Potential consequences: Fire, explosion, or violent reaction.
Group 5-AGroup 5-B
Spent cyanide and sulfide solutionsGroup 1-B wastes
Potential consequences: Generation of toxic hydrogen cyanide or hydrogen sulfide gas.
Group 6-AGroup 6-B
ChloratesAcetic acid and other organic acids
ChlorineConcentrated mineral acids
ChloritesGroup 2-A wastes
Chromic acidGroup 4-A wastes
HyphochloritesOther flammable and combustible wastes
Nitrates
Nitric acid, fuming
Perchlorates
Permanganates
Peroxides
Other strong oxidizers
Potential consequences: Fire, explosion, or violent reaction.
Answer