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ATSDR’s Substance Priority List

What is the Substance Priority List (SPL)?

The Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) section 104 (i), as amended by the Superfund Amendments and Reauthorization Act (SARA), requires ATSDR and the EPA to prepare a list, in order of priority, of substances that are most commonly found at facilities on the National Priorities List (NPL) and which are determined to pose the most significant potential threat to human health due to their known or suspected toxicity and potential for human exposure at these NPL sites. CERCLA also requires this list to be revised periodically to reflect additional information on hazardous substances. In CERCLA, it is called the priority list of hazardous substances that will be candidates for toxicological profiles.

This substance priority list is revised and published on a 2-year basis, with a yearly informal review and revision. (No list was published in 2009 while ATSDR transitioned to a new agency science database.) Each substance on the list is a candidate to become the subject of a toxicological profile prepared by ATSDR. The listing algorithm prioritizes substances based on frequency of occurrence at NPL sites, toxicity, and potential for human exposure to the substances found at NPL sites.

It should be noted that this priority list is not a list of “most toxic” substances, but rather a prioritization of substances based on a combination of their frequency, toxicity, and potential for human exposure at NPL sites.

Thus, it is possible for substances with low toxicity but high NPL frequency of occurrence and exposure to be on this priority list. The objective of this priority list is to rank substances across all NPL hazardous waste sites to provide guidance in selecting which substances will be the subject of toxicological profiles prepared by ATSDR.

Where can I find more information on the Substance Priority List?

Substantial additional information can be found on the SPL Resource page, including:

  • Past Substance Priority Lists
  • A Support Document describing the algorithm in detail
  • A Full SPL Data spreadsheet with all supporting data for current and past lists, including candidate substances that did not make the top of the list

These and other documents can be found on the SPL Resource page.

The ATSDR 2017 Substance Priority List

2017 Rank Substance Name Total Points CAS RN
1 ARSENIC 1674 7440-38-2
2 LEAD 1531 7439-92-1
3 MERCURY 1458 7439-97-6
4 VINYL CHLORIDE 1358 75-01-4
5 POLYCHLORINATED BIPHENYLS 1345 1336-36-3
6 BENZENE 1329 71-43-2
7 CADMIUM 1320 7440-43-9
8 BENZO(A)PYRENE 1306 50-32-8
9 POLYCYCLIC AROMATIC HYDROCARBONS 1279 130498-29-2
10 BENZO(B)FLUORANTHENE 1251 205-99-2
11 CHLOROFORM 1203 67-66-3
12 AROCLOR 1260 1191 11096-82-5
13 DDT, P,P’- 1183 50-29-3
14 AROCLOR 1254 1172 11097-69-1
15 DIBENZO(A,H)ANTHRACENE 1156 53-70-3
16 TRICHLOROETHYLENE 1155 79-01-6
17 CHROMIUM, HEXAVALENT 1148 18540-29-9
18 DIELDRIN 1144 60-57-1
19 PHOSPHORUS, WHITE 1141 7723-14-0
20 HEXACHLOROBUTADIENE 1130 87-68-3
21 DDE, P,P’- 1127 72-55-9
22 CHLORDANE 1126 57-74-9
23 AROCLOR 1242 1126 53469-21-9
24 COAL TAR CREOSOTE 1124 8001-58-9
25 ALDRIN 1116 309-00-2
26 DDD, P,P’- 1114 72-54-8
27 AROCLOR 1248 1105 12672-29-6
28 HEPTACHLOR 1102 76-44-8
29 AROCLOR 1101 12767-79-2
30 BENZIDINE 1093 92-87-5
31 ACROLEIN 1090 107-02-8
32 TOXAPHENE 1089 8001-35-2
33 TETRACHLOROETHYLENE 1078 127-18-4
34 HEXACHLOROCYCLOHEXANE, GAMMA- 1076 58-89-9
35 CYANIDE 1071 57-12-5
36 HEXACHLOROCYCLOHEXANE, BETA- 1054 319-85-7
37 DISULFOTON 1049 298-04-4
38 BENZO(A)ANTHRACENE 1047 56-55-3
39 1,2-DIBROMOETHANE 1043 106-93-4
40 ENDRIN 1039 72-20-8
41 DIAZINON 1038 333-41-5
42 HEXACHLOROCYCLOHEXANE, DELTA- 1036 319-86-8
43 BERYLLIUM 1031 7440-41-7
44 ENDOSULFAN 1029 115-29-7
45 AROCLOR 1221 1028 11104-28-2
46 1,2-DIBROMO-3-CHLOROPROPANE 1027 96-12-8
47 HEPTACHLOR EPOXIDE 1022 1024-57-3
48 ENDOSULFAN, ALPHA 1019 959-98-8
49 CIS-CHLORDANE 1017 5103-71-9
50 CARBON TETRACHLORIDE 1014 56-23-5
51 COBALT 1013 7440-48-4
52 AROCLOR 1016 1012 12674-11-2
53 DDT, O,P’- 1009 789-02-6
54 PENTACHLOROPHENOL 1008 87-86-5
55 METHOXYCHLOR 1007 72-43-5
56 ENDOSULFAN SULFATE 1005 1031-07-8
57 NICKEL 996 7440-02-0
58 DI-N-BUTYL PHTHALATE 995 84-74-2
59 ENDRIN KETONE 993 53494-70-5
60 DIBROMOCHLOROPROPANE 984 67708-83-2
61 BENZO(K)FLUORANTHENE 970 207-08-9
62 TRANS-CHLORDANE 969 5103-74-2
63 ENDOSULFAN, BETA 968 33213-65-9
64 CHLORPYRIFOS 965 2921-88-2
65 XYLENES, TOTAL 964 1330-20-7
66 CHROMIUM(VI) TRIOXIDE 961 1333-82-0
67 AROCLOR 1232 959 11141-16-5
68 ENDRIN ALDEHYDE 959 7421-93-4
69 METHANE 952 74-82-8
70 3,3′-DICHLOROBENZIDINE 942 91-94-1
71 2-HEXANONE 941 591-78-6
72 2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN 941 1746-01-6
73 BENZOFLUORANTHENE 937 56832-73-6
74 TOLUENE 917 108-88-3
75 ZINC 915 7440-66-6
76 PENTACHLOROBENZENE 907 608-93-5
77 DI(2-ETHYLHEXYL)PHTHALATE 906 117-81-7
78 CHROMIUM 895 7440-47-3
79 AROCLOR 1240 889 71328-89-7
80 2,4,6-TRINITROTOLUENE 879 118-96-7
81 NAPHTHALENE 877 91-20-3
82 1,1-DICHLOROETHENE 876 75-35-4
83 BROMODICHLOROETHANE 868 683-53-4
84 DDD, O,P’- 867 53-19-0
85 2,4,6-TRICHLOROPHENOL 867 88-06-2
86 BIS(2-CHLOROETHYL) ETHER 867 111-44-4
87 HYDRAZINE 862 302-01-2
88 METHYLENE CHLORIDE 860 75-09-2
89 2,4-DINITROPHENOL 859 51-28-5
90 4,4′-METHYLENEBIS(2-CHLOROANILINE) 859 101-14-4
91 1,2-DICHLOROETHANE 852 107-06-2
92 THIOCYANATE 847 302-04-5
93 HEXACHLOROBENZENE 844 118-74-1
94 ASBESTOS 841 1332-21-4
95 RDX (Cyclonite) 833 121-82-4
96 RADIUM-226 833 13982-63-3
97 URANIUM 832 7440-61-1
98 2,4-DINITROTOLUENE 832 121-14-2
99 ETHION 831 563-12-2
100 4,6-DINITRO-O-CRESOL 828 534-52-1
101 RADIUM 827 7440-14-4
102 THORIUM 824 7440-29-1
103 DIMETHYLARSINIC ACID 822 75-60-5
104 CHLORINE 821 7782-50-5
105 1,3,5-TRINITROBENZENE 820 99-35-4
106 RADON 818 10043-92-2
107 HEXACHLOROCYCLOHEXANE, ALPHA- 817 319-84-6
108 RADIUM-228 815 15262-20-1
109 THORIUM-230 813 14269-63-7
110 URANIUM-235 812 15117-96-1
111 THORIUM-228 810 14274-82-9
112 RADON-222 810 14859-67-7
113 URANIUM-234 809 13966-29-5
114 N-NITROSODI-N-PROPYLAMINE 808 621-64-7
115 COAL TARS 808 8007-45-2
116 METHYLMERCURY 808 22967-92-6
117 1,1,1-TRICHLOROETHANE 807 71-55-6
118 COPPER 807 7440-50-8
119 CHRYSOTILE ASBESTOS 806 12001-29-5
120 PLUTONIUM-239 806 15117-48-3
121 POLONIUM-210 805 13981-52-7
122 PLUTONIUM-238 805 13981-16-3
123 LEAD-210 805 14255-04-0
124 AMOSITE ASBESTOS 804 12172-73-5
124 PLUTONIUM 804 7440-07-5
124 STRONTIUM-90 804 10098-97-2
127 RADON-220 804 22481-48-7
128 CHLOROBENZENE 804 108-90-7
129 AMERICIUM-241 804 86954-36-1
130 HYDROGEN CYANIDE 803 74-90-8
131 AZINPHOS-METHYL 803 86-50-0
132 ETHYLBENZENE 802 100-41-4
133 CHLORDECONE 802 143-50-0
134 BARIUM 802 7440-39-3
135 NEPTUNIUM-237 802 13994-20-2
136 PLUTONIUM-240 801 14119-33-6
137 1,2,3-TRICHLOROBENZENE 801 87-61-6
138 FLUORANTHENE 800 206-44-0
139 S,S,S-TRIBUTYL PHOSPHOROTRITHIOATE 799 78-48-8
140 MANGANESE 798 7439-96-5
141 CHRYSENE 792 218-01-9
142 2,4,5-TRICHLOROPHENOL 792 95-95-4
143 PERFLUOROOCTANE SULFONIC ACID 788 1763-23-1
144 POLYBROMINATED BIPHENYLS 785 67774-32-7
145 DICOFOL 785 115-32-2
146 SELENIUM 776 7782-49-2
147 1,1,2,2-TETRACHLOROETHANE 776 79-34-5
148 PARATHION 774 56-38-2
149 HEPTACHLORODIBENZO-P-DIOXIN 774 37871-00-4
150 HEXACHLOROCYCLOHEXANE, TECHNICAL GRADE 774 608-73-1
151 TRICHLOROFLUOROETHANE 773 27154-33-2
152 BROMINE 771 7726-95-6
153 AROCLOR 1268 765 11100-14-4
154 1,3-BUTADIENE 762 106-99-0
155 PERFLUOROOCTANOIC ACID 758 335-67-1
156 HEPTACHLORODIBENZOFURAN 756 38998-75-3
157 TRIFLURALIN 755 1582-09-8
158 PERFLUOROHEXANESULFONIC ACID 749 355-46-4
159 1,2,3,4,6,7,8,9-OCTACHLORODIBENZOFURAN 743 39001-02-0
160 AMMONIA 742 7664-41-7
161 2-METHYLNAPHTHALENE 727 91-57-6
162 2,3,4,7,8-PENTACHLORODIBENZOFURAN 724 57117-31-4
163 1,4-DICHLOROBENZENE 724 106-46-7
164 1,1-DICHLOROETHANE 721 75-34-3
165 NALED 721 300-76-5
166 1,1,2-TRICHLOROETHANE 720 79-00-5
167 HEXACHLOROCYCLOPENTADIENE 719 77-47-4
168 1,2-DIPHENYLHYDRAZINE 718 122-66-7
169 PHORATE 716 298-02-2
170 TRICHLOROETHANE 713 25323-89-1
171 ACENAPHTHENE 710 83-32-9
172 TETRACHLOROBIPHENYL 710 26914-33-0
173 PALLADIUM 706 7440-05-3
174 OXYCHLORDANE 705 27304-13-8
175 CRESOL, PARA- 704 106-44-5
176 INDENO(1,2,3-CD)PYRENE 702 193-39-5
177 GAMMA-CHLORDENE 702 56641-38-4
178 TETRACHLOROPHENOL 699 25167-83-3
179 1,2-DICHLOROBENZENE 697 95-50-1
180 1,2-DICHLOROETHENE, TRANS- 691 156-60-5
181 CHLOROETHANE 687 75-00-3
182 P-XYLENE 687 106-42-3
183 ALUMINUM 687 7429-90-5
184 PHENOL 686 108-95-2
185 CARBON MONOXIDE 684 630-08-0
186 CARBON DISULFIDE 682 75-15-0
187 2,4-DIMETHYLPHENOL 680 105-67-9
188 DIBENZOFURAN 676 132-64-9
189 ACETONE 672 67-64-1
190 HEXACHLOROETHANE 671 67-72-1
191 BUTYL METHYL PHTHALATE 668 34006-76-3
192 CHLOROMETHANE 665 74-87-3
193 HEXACHLORODIBENZOFURAN 660 55684-94-1
194 BUTYL BENZYL PHTHALATE 658 85-68-7
195 HYDROGEN SULFIDE 658 7783-06-4
196 DICHLORVOS 656 62-73-7
197 DIBENZOFURANS, CHLORINATED 653 42934-53-2
198 CRESOL, ORTHO- 653 95-48-7
199 HEXACHLORODIBENZO-P-DIOXIN 652 34465-46-8
200 VANADIUM 650 7440-62-2
201 N-NITROSODIMETHYLAMINE 649 62-75-9
202 1,2,4-TRICHLOROBENZENE 647 120-82-1
203 PERFLUORONONANOIC ACID 647 375-95-1
204 ETHOPROP 644 13194-48-4
205 TETRACHLORODIBENZO-P-DIOXIN 641 41903-57-5
206 BROMOFORM 635 75-25-2
207 PENTACHLORODIBENZOFURAN 632 30402-15-4
208 1,3-DICHLOROBENZENE 628 541-73-1
209 PENTACHLORODIBENZO-P-DIOXIN 626 36088-22-9
210 N-NITROSODIPHENYLAMINE 625 86-30-6
211 2,4-DICHLOROPHENOL 619 120-83-2
212 2,3-DIMETHYLNAPHTHALENE 619 581-40-8
213 2,3,7,8-TETRACHLORODIBENZOFURAN 619 51207-31-9
214 1,4-DIOXANE 617 123-91-1
215 FLUORINE 613 7782-41-4
216 NITRITE 610 14797-65-0
217 CESIUM-137 610 10045-97-3
217 CHROMIC ACID 610 7738-94-5
219 2-BUTANONE 608 78-93-3
220 1,2-DICHLOROETHYLENE 608 540-59-0
221 POTASSIUM-40 608 13966-00-2
222 DINITROTOLUENE 607 25321-14-6
223 NITRATE 606 14797-55-8
224 FORMALDEHYDE 605 50-00-0
225 SILVER 605 7440-22-4
226 COAL TAR PITCH 605 65996-93-2
227 THORIUM-227 605 15623-47-9
228 ARSENIC ACID 604 7778-39-4
229 ARSENIC TRIOXIDE 604 1327-53-3
230 BENZOPYRENE 603 73467-76-2
231 CHLORDANE, TECHNICAL 602 12789-03-6
232 STROBANE 602 8001-50-1
233 4-AMINOBIPHENYL 602 92-67-1
233 PYRETHRUM 602 8003-34-7
235 ARSINE 602 7784-42-1
235 DIMETHOATE 602 60-51-5
237 BIS(CHLOROMETHYL) ETHER 602 542-88-1
237 CARBOPHENOTHION 602 786-19-6
239 ALPHA-CHLORDENE 601 56534-02-2
239 IODINE-131 601 10043-66-0
239 MERCURIC CHLORIDE 601 7487-94-7
239 SODIUM ARSENITE 601 7784-46-5
239 URANIUM-233 601 13968-55-3
244 ANTIMONY 601 7440-36-0
245 DIBROMOCHLOROMETHANE 601 124-48-1
246 CRESOLS 598 1319-77-3
247 DICHLOROBENZENE 596 25321-22-6
248 2,4-D 595 94-75-7
249 2-CHLOROPHENOL 591 95-57-8
250 BUTYLATE 591 2008-41-5
251 DIMETHYL FORMAMIDE 585 68-12-2
252 PHENANTHRENE 585 85-01-8
253 4-NITROPHENOL 580 100-02-7
254 DIURON 580 330-54-1
255 TETRACHLOROETHANE 577 25322-20-7
256 DICHLOROETHANE 568 1300-21-6
257 ETHYL ETHER 566 60-29-7
258 DIMETHYLANILINE 563 121-69-7
259 1,3-DICHLOROPROPENE, CIS- 561 10061-01-5
260 PYRENE 561 129-00-0
261 1,2,3,4,6,7,8-HEPTACHLORODIBENZO-P-DIOXIN 559 35822-46-9
262 PHOSPHINE 557 7803-51-2
263 TRICHLOROBENZENE 556 12002-48-1
264 2,6-DINITROTOLUENE 555 606-20-2
265 FLUORIDE ION 550 16984-48-8
266 PENTAERYTHRITOL TETRANITRATE 549 78-11-5
267 1,2,3,4,6,7,8-HEPTACHLORODIBENZOFURAN 549 67562-39-4
268 1,3-DICHLOROPROPENE, TRANS- 548 10061-02-6
269 ACRYLONITRILE 544 107-13-1
270 BIS(2-ETHYLHEXYL)ADIPATE 543 103-23-1
271 CARBAZOLE 541 86-74-8
272 2-CHLOROANILINE 539 95-51-2
273 METOLACHLOR 539 51218-45-2
274 1,2-DICHLOROETHENE, CIS- 539 156-59-2
275 1,2,3-TRICHLOROPROPANE 537 96-18-4

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

CAS RN= Chemical Abstracts Service Registry Number

 

Contact Information

Further information can be obtained by contacting the ATSDR Information Center at:

Agency for Toxic Substances and Disease Registry
Division of Toxicology and Human Health Sciences
1600 Clifton Road NE, Mailstop F-57
Atlanta, GA 30329
Phone: 1-800-CDC-INFO 888-232-6348 (TTY)
Email: Contact CDC-INFO

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