Chemical Name CAS # Threshold Quantity (lbs) Basis for Listing
Acetaldehyde 75-07-0 10,000 g
Acetylene [Ethyne] 74-86-2 10,000 f
Bromotrifluorethylene [Ethene, bromotrifluoro-] 598-73-2 10,000 f
1,3-Butadiene 106-99-0 10,000 f
Butane 106-97-8 10,000 f
1-Butene 106-98-9 10,000 f
2-Butene 107-01-7 10,000 f
Butene 25167-67-3 10,000 f
2-Butene-cis 590-18-1 10,000 f
2-Butene-trans [2-Butene, (E)] 624-64-6 10,000 f
Carbon oxysulfide [Carbon oxide sulfide (COS)] 463-58-1 10,000 f
Chlorine monoxide [Chlorine oxide] 7791-21-1 10,000 f
2-Chloropropylene [1-Propene, 2-chloro-] 557-98-2 10,000 g
1-Chloropropylene [1-Propene, 1-chloro-] 590-21-6 10,000 g
Cyanogen [Ethanedinitrile] 460-19-5 10,000 f
Cyclopropane 75-19-4 10,000 f
Dichlorosilane [Silane, dichloro-] 4109-96-0 10,000 f
Difluoroethane [Ethane, 1,1-difluoro-] 75-37-6 10,000 f
Dimethylamine [Methanamine, N-methyl-] 124-40-3 10,000 f
2,2-Dimethylpropane [Propane, 2,2-dimethyl-] 463-82-1 10,000 f
Ethane 74-84-0 10,000 f
Ethyl acetylene [1-Butyne] 107-00-6 10,000 f
Ethylamine [Ethanamine] 75-04-7 10,000 f
Ethyl chloride [Ethane, chloro-] 75-00-3 10,000 f
Ethylene [Ethene] 74-85-1 10,000 f
Ethyl ether [Ethane, 1,1'-oxybis-] 60-29-7 10,000 g
Ethyl mercaptan [Ethanethiol] 75-08-1 10,000 g
Ethyl nitrite [Nitrous acid, ethyl ester] 109-95-5 10,000 f
Hydrogen 1333-74-0 10,000 f
Isobutane [Propane, 2-methyl] 75-28-5 10,000 f
Isopentane [Butane, 2-methyl-] 78-78-4 10,000 g
Isoprene [1,3-Butadiene, 2-methyl-] 78-79-5 10,000 g
Isopropylamine [2-Propanamine] 75-31-0 10,000 g
Isopropyl chloride [Propane, 2-chloro-] 75-29-6 10,000 g
Methane 74-82-8 10,000 f
Methylamine [Methanamine] 74-89-5 10,000 f
3-Methyl-1-butene 563-45-1 10,000 f
2-Methyl-1-butene 563-46-2 10,000 g
Methyl ether [Methane, oxybis-] 115-10-6 10,000 f
Methyl formate [Formic acid, methyl ester] 107-31-3 10,000 g
2-Methylpropene [1-Propene, 2-methyl-] 115-11-7 10,000 f
1,3-Pentadiene 504-60-9 10,000 f
Pentane 109-66-0 10,000 g
1-Pentene 109-67-1 10,000 g
2-Pentene, (E)- 646-04-8 10,000 g
2-Pentene, (Z)- 627-20-3 10,000 g
Propadiene [1,2-Propadiene] 463-49-0 10,000 f
Propane 74-98-6 10,000 f
Propylene [1-Propene] 115-07-1 10,000 f
Propyne [1-Propyne] 74-99-7 10,000 f
Silane 7803-62-5 10,000 f
Tetrafluoroethylene [Ethene, tetrafluoro-] 116-14-3 10,000 f
Tetramethylsilane [Silane, tetramethyl-] 75-76-3 10,000 g
Trichlorosilane [Silane, trichloro-] 10025-78-2 10,000 g
Trifluorochloroethylene [Ethene, chlorotrifluoro-] 79-38-9 10,000 f
Trimethylamine [Methanamine, N,N-dimethyl-] 75-50-3 10,000 f
Vinyl acetylene [1-Buten-3-yne] 689-97-4 10,000 f
Vinyl chloride [Ethene, chloro-] 75-01-4 10,000 a, f
Vinyl ethyl ether [Ethene, ethoxy-] 109-92-2 10,000 g
Vinyl fluoride [Ethene, fluoro-] 75-02-5 10,000 f
Vinylidene chloride [Ethene, 1,1-dichloro-] 75-35-4 10,000 g
Vinylidene fluoride [Ethene, 1,1-difluoro-] 75-38-7 10,000 f
Vinyl methyl ether [Ethene, methoxy-] 107-25-5 10,000 f

Basis for Listing:

  1. Mandated for listing by Congress
  2. On EHS list, vapor pressure 10 mmHg or greater
  3. Toxic gas
  4. Toxicity of hydrogen chloride, potential to release hydrogen chloride, & history of accidents
  5. Toxicity of sulfur trioxide and sulfuric acid, potential to release sulfur trioxide, & history of accidents
  6. Flammable gas
  7. Volatile flammable liquid

County Services

It's illegal to burn anything other than vegetation!  Learn the facts.
Traveling abroad?  Learn more about our Immunization Clinic.