AGENCY FOR TOXIC SUBSTANCES AND DISEASE REGISTRY

2011 PRIORITY LIST OF HAZARDOUS SUBSTANCES

1

2011 

Rank Substance Name TotalPoints

2007

Rank CAS #

1 ARSENIC 1665.5 1 007440-38-2

2 LEAD 1529.1 2 007439-92-1

3 MERCURY 1460.9 3 007439-97-6

4 VINYL CHLORIDE 1361.1 4 000075-01-4

5 POLYCHLORINATED BIPHENYLS 1344.1 5 001336-36-3

6 BENZENE 1332.0 6 000071-43-2

7 CADMIUM 1318.7 7 007440-43-9

8 BENZO(A)PYRENE 1305.7 9 000050-32-8

9 POLYCYCLIC AROMATIC HYDROCARBONS 1282.3 8 130498-29-2

10 BENZO(B)FLUORANTHENE 1252.4 10 000205-99-2

11 CHLOROFORM 1207.5 11 000067-66-3

12 AROCLOR 1260 1190.0 14 011096-82-5

13 DDT, P,P'- 1183.0 12 000050-29-3

14 AROCLOR 1254 1171.7 13 011097-69-1

15 DIBENZO(A,H)ANTHRACENE 1155.2 15 000053-70-3

16 TRICHLOROETHYLENE 1151.1 16 000079-01-6

17 CHROMIUM, HEXAVALENT 1146.6 18 018540-29-9

18 DIELDRIN 1143.1 17 000060-57-1

19 PHOSPHORUS, WHITE 1141.9 19 007723-14-0

20 HEXACHLOROBUTADIENE 1128.5 22 000087-68-3

21 DDE, P,P'- 1127.2 21 000072-55-9

22 CHLORDANE 1126.4 20 000057-74-9

23 COAL TAR CREOSOTE 1124.8 23 008001-58-9

24 AROCLOR 1242 1123.8 29 053469-21-9

25 ALDRIN 1115.8 24 000309-00-2

26 DDD, P,P'- 1114.2 25 000072-54-8

27 AROCLOR 1248 1103.9 27 012672-29-6

28 HEPTACHLOR 1101.1 34 000076-44-8

29 AROCLOR 1099.4 30 012767-79-2

30 BENZIDINE 1090.6 26 000092-87-5

31 ACROLEIN 1088.5 37 000107-02-8

32 TOXAPHENE 1087.7 31 008001-35-2

33 TETRACHLOROETHYLENE 1077.4 33 000127-18-4

34 HEXACHLOROCYCLOHEXANE, GAMMA- 1074.7 32 000058-89-9

35 CYANIDE 1071.9 28 000057-12-5

36 HEXACHLOROCYCLOHEXANE, BETA- 1053.5 36 000319-85-7

37 BENZO(A)ANTHRACENE 1047.6 39 000056-55-3

38 DISULFOTON 1047.2 38 000298-04-4

39 1,2-DIBROMOETHANE 1041.9 35 000106-93-4

40 ENDRIN 1038.3 41 000072-20-8

41 DIAZINON 1036.7 56 000333-41-5
AGENCY FOR TOXIC SUBSTANCES AND DISEASE REGISTRY

2011 PRIORITY LIST OF HAZARDOUS SUBSTANCES

2

2011 

Rank Substance Name TotalPoints

2007

Rank CAS #

42 HEXACHLOROCYCLOHEXANE, DELTA- 1034.8 43 000319-86-8

43 BERYLLIUM 1032.7 42 007440-41-7

44 ENDOSULFAN 1028.0 54 000115-29-7

45 AROCLOR 1221 1027.1 48 011104-28-2

46 1,2-DIBROMO-3-CHLOROPROPANE 1025.8 44 000096-12-8

47 HEPTACHLOR EPOXIDE 1021.4 46 001024-57-3

48 ENDOSULFAN, ALPHA 1018.4 57 000959-98-8

49 CIS-CHLORDANE 1016.1 59 005103-71-9

50 CARBON TETRACHLORIDE 1015.5 47 000056-23-5

51 AROCLOR 1016 1011.9 51 012674-11-2

52 COBALT 1010.9 49 007440-48-4

53 PENTACHLOROPHENOL 1009.0 45 000087-86-5

54 DDT, O,P'- 1007.9 50 000789-02-6

55 METHOXYCHLOR 1006.3 61 000072-43-5

56 ENDOSULFAN SULFATE 1003.9 55 001031-07-8

57 NICKEL 998.7 53 007440-02-0

58 DI-N-BUTYL PHTHALATE 997.3 52 000084-74-2

59 ENDRIN KETONE 992.0 63 053494-70-5

60 DIBROMOCHLOROPROPANE 983.0 60 067708-83-2

61 BENZO(K)FLUORANTHENE 972.2 62 000207-08-9

62 XYLENES, TOTAL 969.2 58 001330-20-7

63 TRANS-CHLORDANE 968.3 64 005103-74-2

64 ENDOSULFAN, BETA 967.6 67 033213-65-9

65 CHLORPYRIFOS 963.9 127 002921-88-2

66 CHROMIUM(VI) TRIOXIDE 960.0 65 001333-82-0

67 AROCLOR 1232 958.2 68 011141-16-5

68 ENDRIN ALDEHYDE 957.7 69 007421-93-4

69 METHANE 953.4 66 000074-82-8

70 2-HEXANONE 941.4 72 000591-78-6

71 2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN 940.9 73 001746-01-6

72 3,3'-DICHLOROBENZIDINE 940.6 40 000091-94-1

73 BENZOFLUORANTHENE 935.7 70 056832-73-6

74 TOLUENE 924.1 71 000108-88-3

75 ZINC 919.1 74 007440-66-6

76 DI(2-ETHYLHEXYL)PHTHALATE 908.0 76 000117-81-7

77 PENTACHLOROBENZENE 906.8 155 000608-93-5

78 CHROMIUM 897.5 77 007440-47-3

79 AROCLOR 1240 888.3 81 071328-89-7

80 NAPHTHALENE 881.4 78 000091-20-3

81 1,1-DICHLOROETHENE 879.5 79 000075-35-4

82 2,4,6-TRINITROTOLUENE 877.5 82 000118-96-7
AGENCY FOR TOXIC SUBSTANCES AND DISEASE REGISTRY

2011 PRIORITY LIST OF HAZARDOUS SUBSTANCES

3

2011 

Rank Substance Name TotalPoints

2007

Rank CAS #

83 2,4,6-TRICHLOROPHENOL 866.4 86 000088-06-2

84 BIS(2-CHLOROETHYL) ETHER 866.3 88 000111-44-4

85 BROMODICHLOROETHANE 866.2 83 000683-53-4

86 METHYLENE CHLORIDE 865.6 80 000075-09-2

87 DDD, O,P'- 865.6 151 000053-19-0

88 HYDRAZINE 860.8 84 000302-01-2

89 2,4-DINITROPHENOL 858.4 87 000051-28-5

90 4,4'-METHYLENEBIS(2-CHLOROANILINE) 857.2 152 000101-14-4

91 1,2-DICHLOROETHANE 853.6 85 000107-06-2

92 THIOCYANATE 845.8 89 000302-04-5

93 HEXACHLOROBENZENE 844.3 93 000118-74-1

94 ASBESTOS 841.4 90 001332-21-4

95 RADIUM-226 833.3 95 013982-63-3

96 RDX (CYCLOTRIMETHYLENETRINITRAMINE) 831.8 92 000121-82-4

97 URANIUM 831.8 98 007440-61-1

98 2,4-DINITROTOLUENE 831.2 94 000121-14-2

99 ETHION 829.9 96 000563-12-2

100 RADIUM 827.7 100 007440-14-4

101 4,6-DINITRO-O-CRESOL 827.3 102 000534-52-1

102 THORIUM 823.4 101 007440-29-1

103 DIMETHYLARSINIC ACID 821.2 75 000075-60-5

104 CHLORINE 820.6 91 007782-50-5

105 RADON 818.6 105 010043-92-2

106 1,3,5-TRINITROBENZENE 818.6 103 000099-35-4

107 HEXACHLOROCYCLOHEXANE, ALPHA- 817.3 115 000319-84-6

108 RADIUM-228 815.3 106 015262-20-1

109 THORIUM-230 813.7 107 014269-63-7

110 1,1,1-TRICHLOROETHANE 812.4 97 000071-55-6

111 URANIUM-235 812.1 107 015117-96-1

112 URANIUM-234 809.6 111 013966-29-5

113 THORIUM-228 809.5 113 014274-82-9

114 RADON-222 809.3 114 014859-67-7

115 COAL TARS 808.2 118 008007-45-2

116 ETHYLBENZENE 807.7 99 000100-41-4

117 CHLOROBENZENE 807.0 104 000108-90-7

118 N-NITROSODI-N-PROPYLAMINE 806.9 112 000621-64-7

119 CHRYSOTILE ASBESTOS 806.2 119 012001-29-5

120 METHYLMERCURY 806.0 123 022967-92-6

120 PLUTONIUM-239 806.0 121 015117-48-3

122 POLONIUM-210 805.6 122 013981-52-7

123 PLUTONIUM-238 805.2 124 013981-16-3
AGENCY FOR TOXIC SUBSTANCES AND DISEASE REGISTRY

2011 PRIORITY LIST OF HAZARDOUS SUBSTANCES

4

2011 

Rank Substance Name TotalPoints

2007

Rank CAS #

124 LEAD-210 805.1 125 014255-04-0

125 COPPER 804.7 128 007440-50-8

126 BARIUM 804.7 109 007440-39-3

127 AMOSITE ASBESTOS 804.3 131 012172-73-5

127 PLUTONIUM 804.3 126 007440-07-5

127 STRONTIUM-90 804.3 119 010098-97-2

130 RADON-220 804.2 130 022481-48-7

131 AMERICIUM-241 803.8 129 086954-36-1

132 TRIBUTYLTIN 802.9 134 000688-73-3

133 FLUORANTHENE 802.6 110 000206-44-0

134 AZINPHOS-METHYL 802.6 135 000086-50-0

135 CHLORDECONE 802.1 138 000143-50-0

136 NEPTUNIUM-237 801.9 136 013994-20-2

137 HYDROGEN CYANIDE 801.5 133 000074-90-8

138 PLUTONIUM-240 801.4 138 014119-33-6

139 1,2,3-TRICHLOROBENZENE 800.3 116 000087-61-6

140 MANGANESE 799.4 117 007439-96-5

141 S,S,S-TRIBUTYL PHOSPHOROTRITHIOATE 797.6 141 000078-48-8

142 CHRYSENE 793.4 137 000218-01-9

143 2,4,5-TRICHLOROPHENOL 790.4 222 000095-95-4

144 POLYBROMINATED BIPHENYLS 784.3 143 067774-32-7

145 DICOFOL 783.8 144 000115-32-2

146 SELENIUM 778.3 147 007782-49-2

147 1,1,2,2-TETRACHLOROETHANE 777.5 146 000079-34-5

148 HEPTACHLORODIBENZO-P-DIOXIN 773.8 154 037871-00-4

149 PARATHION 773.5 145 000056-38-2

150 HEXACHLOROCYCLOHEXANE, TECHNICAL GRADE 773.2 148 000608-73-1

151 TRICHLOROFLUOROETHANE 772.4 149 027154-33-2

152 BROMINE 770.1 142 007726-95-6

153 HEPTACHLORODIBENZOFURAN 755.5 166 038998-75-3

154 TRIFLURALIN 754.3 150 001582-09-8

155 1,3-BUTADIENE 750.4 156 000106-99-0

156 1,2,3,4,6,7,8,9-OCTACHLORODIBENZOFURAN 742.9 162 039001-02-0

157 AMMONIA 741.8 157 007664-41-7

158 2-METHYLNAPHTHALENE 728.9 158 000091-57-6

159 1,4-DICHLOROBENZENE 725.5 159 000106-46-7

160 1,1-DICHLOROETHANE 725.0 160 000075-34-3

161 2,3,4,7,8-PENTACHLORODIBENZOFURAN 723.6 168 057117-31-4

162 NALED 720.6 235 000300-76-5

163 HEXACHLOROCYCLOPENTADIENE 718.1 165 000077-47-4

164 1,2-DIPHENYLHYDRAZINE 717.9 167 000122-66-7
AGENCY FOR TOXIC SUBSTANCES AND DISEASE REGISTRY

2011 PRIORITY LIST OF HAZARDOUS SUBSTANCES

5

2011 

Rank Substance Name TotalPoints

2007

Rank CAS #

165 1,1,2-TRICHLOROETHANE 717.0 163 000079-00-5

166 PHORATE 715.2 225 000298-02-2

167 TRICHLOROETHANE 713.8 164 025323-89-1

168 ACENAPHTHENE 711.8 161 000083-32-9

169 TETRACHLOROBIPHENYL 709.2 169 026914-33-0

170 OXYCHLORDANE 705.5 171 027304-13-8

171 PALLADIUM 705.4 180 007440-05-3

172 CRESOL, PARA- 704.8 170 000106-44-5

173 INDENO(1,2,3-CD)PYRENE 702.6 174 000193-39-5

174 GAMMA-CHLORDENE 701.9 175 056641-38-4

175 1,2-DICHLOROBENZENE 698.0 172 000095-50-1

176 TETRACHLOROPHENOL 697.0 177 025167-83-3

177 1,2-DICHLOROETHENE, TRANS- 695.5 173 000156-60-5

178 CHLOROETHANE 688.9 183 000075-00-3

179 PHENOL 688.4 182 000108-95-2

180 P-XYLENE 686.6 185 000106-42-3

181 ALUMINUM 684.7 187 007429-90-5

182 CARBON DISULFIDE 683.0 176 000075-15-0

183 CARBON MONOXIDE 682.2 189 000630-08-0

184 2,4-DIMETHYLPHENOL 680.5 188 000105-67-9

185 DIBENZOFURAN 677.3 186 000132-64-9

186 ACETONE 676.5 184 000067-64-1

187 HEXACHLOROETHANE 669.4 197 000067-72-1

188 BUTYL METHYL PHTHALATE 667.4 194 034006-76-3

189 CHLOROMETHANE 666.3 193 000074-87-3

190 HEXACHLORODIBENZOFURAN 660.1 181 055684-94-1

191 BUTYL BENZYL PHTHALATE 659.1 195 000085-68-7

192 HYDROGEN SULFIDE 656.3 191 007783-06-4

193 DICHLORVOS 655.5 240 000062-73-7

194 CRESOL, ORTHO- 653.4 196 000095-48-7

195 DIBENZOFURANS, CHLORINATED 653.0 236 042934-53-2

196 HEXACHLORODIBENZO-P-DIOXIN 651.7 153 034465-46-8

197 VANADIUM 649.9 198 007440-62-2

198 N-NITROSODIMETHYLAMINE 648.3 199 000062-75-9

199 1,2,4-TRICHLOROBENZENE 647.4 200 000120-82-1

200 ETHOPROP 643.7 236 013194-48-4

201 TETRACHLORODIBENZO-P-DIOXIN 641.5 202 041903-57-5

202 BROMOFORM 635.1 201 000075-25-2

203 PENTACHLORODIBENZOFURAN 631.7 192 030402-15-4

204 1,3-DICHLOROBENZENE 628.6 203 000541-73-1

205 PENTACHLORODIBENZO-P-DIOXIN 625.9 204 036088-22-9
AGENCY FOR TOXIC SUBSTANCES AND DISEASE REGISTRY

2011 PRIORITY LIST OF HAZARDOUS SUBSTANCES

6

2011 

Rank Substance Name TotalPoints

2007

Rank CAS #

206 N-NITROSODIPHENYLAMINE 625.8 205 000086-30-6

207 2,3,7,8-TETRACHLORODIBENZOFURAN 618.9 207 051207-31-9

208 2,4-DICHLOROPHENOL 618.5 209 000120-83-2

209 2,3-DIMETHYLNAPHTHALENE 617.5 New 000581-40-8

210 1,4-DIOXANE 613.5 210 000123-91-1

211 FLUORINE 613.3 211 007782-41-4

212 2-BUTANONE 611.1 208 000078-93-3

213 1,2-DICHLOROETHYLENE 610.4 206 000540-59-0

214 CESIUM-137 610.0 213 010045-97-3

214 CHROMIC ACID 610.0 215 007738-94-5

216 NITRITE 609.0 212 014797-65-0

217 SILVER 608.1 214 007440-22-4

218 POTASSIUM-40 607.6 217 013966-00-2

219 DINITROTOLUENE 607.3 218 025321-14-6

220 NITRATE 606.0 216 014797-55-8

221 COAL TAR PITCH 605.2 220 065996-93-2

222 THORIUM-227 605.0 221 015623-47-9

223 ARSENIC ACID 604.3 223 007778-39-4

224 ARSENIC TRIOXIDE 603.8 224 001327-53-3

225 BENZOPYRENE 602.9 226 073467-76-2

226 CHLORDANE, TECHNICAL 602.5 228 012789-03-6

227 STROBANE 602.5 230 008001-50-1

228 4-AMINOBIPHENYL 602.4 232 000092-67-1

228 PYRETHRUM 602.4 232 008003-34-7

230 ARSINE 602.4 234 007784-42-1

230 DIMETHOATE 602.4 229 000060-51-5

232 ANTIMONY 602.2 219 007440-36-0

233 CARBOPHENOTHION 601.9 238 000786-19-6

234 ALPHA-CHLORDENE 601.4 238 056534-02-2

234 IODINE-131 601.4 132 010043-66-0

234 MERCURIC CHLORIDE 601.4 241 007487-94-7

234 SODIUM ARSENITE 601.4 241 007784-46-5

234 URANIUM-233 601.4 178 013968-55-3

239 DIBROMOCHLOROMETHANE 600.5 249 000124-48-1

240 CRESOLS 597.1 227 001319-77-3

241 FORMALDEHYDE 596.0 244 000050-00-0

242 DICHLOROBENZENE 595.4 254 025321-22-6

243 2,4-D ACID 594.5 248 000094-75-7

244 2-CHLOROPHENOL 591.1 245 000095-57-8

245 BUTYLATE 589.9 251 002008-41-5

246 PHENANTHRENE 588.3 246 000085-01-8
AGENCY FOR TOXIC SUBSTANCES AND DISEASE REGISTRY

2011 PRIORITY LIST OF HAZARDOUS SUBSTANCES

7

2011 

Rank Substance Name TotalPoints

2007

Rank CAS #

247 DIMETHYL FORMAMIDE 585.3 252 000068-12-2

248 4-NITROPHENOL 580.0 257 000100-02-7

249 DIURON 578.7 250 000330-54-1

250 TETRACHLOROETHANE 576.7 190 025322-20-7

251 DICHLOROETHANE 567.8 256 001300-21-6

252 ETHYL ETHER 565.2 255 000060-29-7

253 PYRENE 564.1 253 000129-00-0

254 DIMETHYLANILINE 561.8 New 000121-69-7

255 1,3-DICHLOROPROPENE, CIS- 561.0 258 010061-01-5

256 1,2,3,4,6,7,8-HEPTACHLORODIBENZO-P-DIOXIN 558.9 263 035822-46-9

257 PHOSPHINE 555.2 259 007803-51-2

258 TRICHLOROBENZENE 555.1 260 012002-48-1

259 2,6-DINITROTOLUENE 554.4 261 000606-20-2

260 FLUORIDE ION 549.9 262 016984-48-8

261 1,2,3,4,6,7,8-HEPTACHLORODIBENZOFURAN 548.8 273 067562-39-4

262 PENTAERYTHRITOL TETRANITRATE 548.2 265 000078-11-5

263 1,3-DICHLOROPROPENE, TRANS- 548.0 266 010061-02-6

264 ACRYLONITRILE 543.2 274 000107-13-1

265 BIS(2-ETHYLHEXYL)ADIPATE 542.4 267 000103-23-1

266 CARBAZOLE 538.6 268 000086-74-8

267 METOLACHLOR 538.2 New 051218-45-2

268 2-CHLOROANILINE 537.9 New 000095-51-2

269 1,2,3-TRICHLOROPROPANE 536.1 New 000096-18-4

270 CARBARYL 535.5 272 000063-25-2

271 1,2-DICHLOROETHENE, CIS- 533.8 270 000156-59-2

272 METHYL ISOBUTYL KETONE 529.6 269 000108-10-1

273 STYRENE 529.4 271 000100-42-5

274 THALLIUM 525.3 New 007440-28-0

275 1,2,3,7,8,9-HEXACHLORODIBENZOFURAN 524.3 New 072918-21-9

Substances were assigned the same rank when two (or more) substances received equivalent total point 

scores.

CAS #= Chemical Abstracts Service Registry Number

www.atsdr.cdc.gov/SPL