| Order | Substance Name | All Sites | NPL Sites | CAS Number |
|---|---|---|---|---|
| 1 | LEAD | 359 | 238 | 007439-92-1 |
| 2 | TRICHLOROETHYLENE | 319 | 271 | 000079-01-6 |
| 3 | ARSENIC | 267 | 176 | 007440-38-2 |
| 4 | TETRACHLOROETHYLENE | 236 | 190 | 000127-18-4 |
| 5 | CADMIUM | 176 | 123 | 007440-43-9 |
| 6 | BENZENE | 174 | 128 | 000071-43-2 |
| 7 | CHROMIUM | 169 | 113 | 007440-47-3 |
| 8 | VOLATILE ORGANIC COMPOUNDS, UNSPECIFIED | 162 | 118 | HZ1900-01-T |
| 9 | POLYCHLORINATED BIPHENYLS | 152 | 104 | 001336-36-3 |
| 10 | MERCURY | 136 | 82 | 007439-97-6 |
| 11 | ZINC | 134 | 83 | 007440-66-6 |
| 11 | MANGANESE | 134 | 80 | 007439-96-5 |
| 13 | 1,1,1-TRICHLOROETHANE | 125 | 106 | 000071-55-6 |
| 14 | COPPER | 118 | 67 | 007440-50-8 |
| 15 | CHLOROFORM | 113 | 88 | 000067-66-3 |
| 16 | 1,1-DICHLOROETHENE | 105 | 91 | 000075-35-4 |
| 17 | METHYLENE CHLORIDE | 103 | 72 | 000075-09-2 |
| 18 | TOLUENE | 102 | 68 | 000108-88-3 |
| 19 | VINYL CHLORIDE | 99 | 84 | 000075-01-4 |
| 20 | NICKEL | 98 | 63 | 007440-02-0 |
| 20 | BENZO(A)PYRENE | 98 | 54 | 000050-32-8 |
| 22 | POLYCYCLIC AROMATIC HYDROCARBONS | 97 | 68 | 130498-29-2 |
| 23 | BARIUM | 96 | 54 | 007440-39-3 |
| 24 | ANTIMONY | 88 | 57 | 007440-36-0 |
| 25 | 1,2-DICHLOROETHANE | 86 | 71 | 000107-06-2 |
| 26 | DI(2-ETHYLHEXYL)PHTHALATE | 85 | 55 | 000117-81-7 |
| 27 | 1,1-DICHLOROETHANE | 84 | 75 | 000075-34-3 |
| 28 | BERYLLIUM | 78 | 36 | 007440-41-7 |
| 29 | BENZO(A)ANTHRACENE | 75 | 40 | 000056-55-3 |
| 30 | CARBON TETRACHLORIDE | 74 | 54 | 000056-23-5 |
| 30 | CHRYSENE | 74 | 36 | 000218-01-9 |
| 32 | VANADIUM | 73 | 39 | 007440-62-2 |
| 33 | NAPHTHALENE | 69 | 38 | 000091-20-3 |
| 33 | PHENANTHRENE | 69 | 31 | 000085-01-8 |
| 35 | BENZO(B)FLUORANTHENE | 64 | 27 | 000205-99-2 |
| 36 | METALS, UNSPECIFIED | 63 | 44 | HZ0900-01-T |
| 36 | IRON | 63 | 40 | 007439-89-6 |
| 36 | ETHYLBENZENE | 63 | 39 | 000100-41-4 |
| 39 | XYLENES, TOTAL | 62 | 39 | 001330-20-7 |
| 39 | BENZO(K)FLUORANTHENE | 62 | 29 | 000207-08-9 |
| 41 | INDENO(1,2,3-CD)PYRENE | 58 | 26 | 000193-39-5 |
| 42 | COBALT | 55 | 26 | 007440-48-4 |
| 43 | DDT, P,P'- | 53 | 33 | 000050-29-3 |
| 44 | PENTACHLOROPHENOL | 51 | 36 | 000087-86-5 |
| 44 | DIELDRIN | 51 | 27 | 000060-57-1 |
| 44 | DIBENZO(A,H)ANTHRACENE | 51 | 26 | 000053-70-3 |
| 47 | 1,2-DICHLOROETHENE, TRANS- | 50 | 47 | 000156-60-5 |
| 47 | DDE, P,P'- | 50 | 30 | 000072-55-9 |
| 49 | SELENIUM | 49 | 23 | 007782-49-2 |
| 50 | BENZO(GHI)PERYLENE | 48 | 19 | 000191-24-2 |
| 51 | 1,2-DICHLOROETHYLENE | 47 | 40 | 000540-59-0 |
| 51 | SODIUM | 47 | 33 | 007440-23-5 |
| 51 | ALUMINUM | 47 | 31 | 007429-90-5 |
| 54 | CHLOROBENZENE | 46 | 34 | 000108-90-7 |
| 55 | 2-METHYLNAPHTHALENE | 44 | 20 | 000091-57-6 |
| 56 | DDD, P,P'- | 43 | 25 | 000072-54-8 |
| 56 | THALLIUM | 43 | 20 | 007440-28-0 |
| 56 | FLUORANTHENE | 43 | 18 | 000206-44-0 |
| 56 | PYRENE | 43 | 18 | 000129-00-0 |
| 60 | CYANIDE | 42 | 24 | 000057-12-5 |
| 61 | CHLORDANE | 39 | 27 | 000057-74-9 |
| 62 | DIBENZOFURAN | 38 | 17 | 000132-64-9 |
| 63 | PESTICIDES, UNSPECIFIED | 37 | 23 | HZ1200-01-T |
| 63 | HEPTACHLOR EPOXIDE | 37 | 17 | 001024-57-3 |
| 65 | 1,2-DICHLOROETHENE, CIS- | 35 | 28 | 000156-59-2 |
| 65 | SILVER | 35 | 17 | 007440-22-4 |
| 67 | ACETONE | 32 | 21 | 000067-64-1 |
| 67 | MAGNESIUM | 32 | 21 | 007439-95-4 |
| 69 | FLUORENE | 31 | 13 | 000086-73-7 |
| 70 | 2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN | 29 | 23 | 001746-01-6 |
| 70 | BROMODICHLOROMETHANE | 29 | 23 | 000075-27-4 |
| 70 | ASBESTOS | 29 | 15 | 001332-21-4 |
| 70 | ANTHRACENE | 29 | 10 | 000120-12-7 |
| 74 | 2-BUTANONE | 28 | 21 | 000078-93-3 |
| 74 | NITRATE | 28 | 21 | 014797-55-8 |
| 74 | DI-N-BUTYL PHTHALATE | 28 | 14 | 000084-74-2 |
| 74 | ACENAPHTHENE | 28 | 10 | 000083-32-9 |
| 78 | ACENAPHTHYLENE | 27 | 11 | 000208-96-8 |
| 78 | CARBAZOLE | 27 | 8 | 000086-74-8 |
| 80 | CALCIUM | 26 | 22 | 007440-70-2 |
| 80 | AROCLOR 1254 | 26 | 17 | 011097-69-1 |
| 80 | AROCLOR 1260 | 26 | 17 | 011096-82-5 |
| 80 | BUTYL BENZYL PHTHALATE | 26 | 7 | 000085-68-7 |
| 84 | 1,1,2,2-TETRACHLOROETHANE | 25 | 18 | 000079-34-5 |
| 84 | 1,2-DICHLOROPROPANE | 25 | 18 | 000078-87-5 |
| 84 | PHENOL | 25 | 15 | 000108-95-2 |
| 84 | STYRENE | 25 | 13 | 000100-42-5 |
| 88 | ALDRIN | 24 | 7 | 000309-00-2 |
| 89 | CRESOL, PARA- | 23 | 9 | 000106-44-5 |
| 90 | 1,1,2-TRICHLOROETHANE | 22 | 18 | 000079-00-5 |
| 90 | 1,4-DICHLOROBENZENE | 22 | 10 | 000106-46-7 |
| 92 | HEPTACHLOR | 21 | 6 | 000076-44-8 |
| 93 | POTASSIUM | 20 | 16 | 007440-09-7 |
| 93 | CHLORODIBROMOMETHANE | 20 | 15 | 000124-48-1 |
| 93 | DI-N-OCTYL PHTHALATE | 20 | 12 | 000117-84-0 |
| 93 | CHLOROMETHANE | 20 | 11 | 000074-87-3 |
| 93 | HEXACHLOROCYCLOHEXANE, GAMMA- | 20 | 11 | 000058-89-9 |
| 93 | 1,2,4-TRIMETHYLBENZENE | 20 | 2 | 000095-63-6 |
| 99 | DIOXINS, UNSPECIFIED | 19 | 14 | HZ0400-05-T |
| 99 | SEMIVOLATILE ORGANIC COMPOUNDS | 19 | 12 | HZ1900-02-T |
| 99 | TRANS-CHLORDANE | 19 | 3 | 005103-74-2 |
(101 substances are shown because 3 were found
at 19 sites and tie for 99th)
All Sites = all sites with ATSDR activities
NPL Sites = current and former sites on the National Priorities
List
CAS = Chemical Abstracts Service
CEP = Completed Exposure Pathway
Summary Statistics for This Sept. 2001 HazDat Analysis:
| All Sites | NPL Sites | |
|---|---|---|
| Number of Sites/Events in HazDat | 4,409 | 1,611 |
| Number of Public Health Assessments (PHAs) | 2,291 | 1,587 |
| Number of Sites/Events with CEPs | 1,062 | 696 |
| Number of CEP records (incidents) in HazDat | 14,369 | 9,353 |
| Number of CEP records (incidents) from PHAs | 9,603 | 6,860 |
| Total number of substances in CEPs | 641 | 484 |
