| Order | Name | Sites | NPL Sites | CAS Number |
|---|---|---|---|---|
| 1 | LEAD | 298 | 206 | 007439-92-1 |
| 2 | TRICHLOROETHYLENE | 277 | 239 | 000079-01-6 |
| 3 | ARSENIC | 215 | 147 | 007440-38-2 |
| 4 | TETRACHLOROETHYLENE | 206 | 167 | 000127-18-4 |
| 5 | BENZENE | 149 | 116 | 000071-43-2 |
| 6 | CADMIUM | 148 | 105 | 007440-43-9 |
| 7 | CHROMIUM | 146 | 102 | 007440-47-3 |
| 8 | POLYCHLORINATED BIPHENYLS | 130 | 96 | 001336-36-3 |
| 9 | 1,1,1-TRICHLOROETHANE | 116 | 97 | 000071-55-6 |
| 9 | ZINC | 116 | 75 | 007440-66-6 |
| 9 | MANGANESE | 116 | 73 | 007439-96-5 |
| 12 | MERCURY | 115 | 74 | 007439-97-6 |
| 13 | COPPER | 101 | 61 | 007440-50-8 |
| 14 | VOLATILE ORGANIC COMPOUNDS, UNSPECIFIED | 99 | 73 | HZ1900-01-T |
| 15 | CHLOROFORM | 98 | 81 | 000067-66-3 |
| 16 | 1,1-DICHLOROETHENE | 94 | 87 | 000075-35-4 |
| 17 | METHYLENE CHLORIDE | 93 | 69 | 000075-09-2 |
| 18 | TOLUENE | 86 | 60 | 000108-88-3 |
| 19 | NICKEL | 84 | 59 | 007440-02-0 |
| 20 | BARIUM | 82 | 52 | 007440-39-3 |
| 21 | VINYL CHLORIDE | 81 | 75 | 000075-01-4 |
| 22 | 1,1-DICHLOROETHANE | 80 | 72 | 000075-34-3 |
| 23 | 1,2-DICHLOROETHANE | 77 | 66 | 000107-06-2 |
| 23 | BENZO(A)PYRENE | 77 | 46 | 000050-32-8 |
| 25 | ANTIMONY | 74 | 50 | 007440-36-0 |
| 26 | POLYCYCLIC AROMATIC HYDROCARBONS | 73 | 55 | 130498-29-2 |
| 27 | DI(2-ETHYLHEXYL)PHTHALATE | 67 | 49 | 000117-81-7 |
| 27 | CHRYSENE | 67 | 37 | 000218-01-9 |
| 29 | BENZO(A)ANTHRACENE | 65 | 39 | 000056-55-3 |
| 30 | VANADIUM | 63 | 39 | 007440-62-2 |
| 30 | BERYLLIUM | 63 | 34 | 007440-41-7 |
| 32 | CARBON TETRACHLORIDE | 62 | 47 | 000056-23-5 |
| 32 | NAPHTHALENE | 62 | 37 | 000091-20-3 |
| 34 | PHENANTHRENE | 61 | 32 | 000085-01-8 |
| 35 | XYLENES, TOTAL | 56 | 38 | 001330-20-7 |
| 36 | BENZO(B)FLUORANTHENE | 55 | 28 | 000205-99-2 |
| 37 | BENZO(K)FLUORANTHENE | 54 | 30 | 000207-08-9 |
| 38 | ETHYLBENZENE | 53 | 36 | 000100-41-4 |
| 39 | INDENO(1,2,3-CD)PYRENE | 52 | 26 | 000193-39-5 |
| 40 | IRON | 50 | 34 | 007439-89-6 |
| 41 | 1,2-DICHLOROETHENE, TRANS- | 48 | 46 | 000156-60-5 |
| 42 | COBALT | 45 | 25 | 007440-48-4 |
| 42 | DIBENZO(A,H)ANTHRACENE | 45 | 25 | 000053-70-3 |
| 44 | DDT, P,P'- | 44 | 28 | 000050-29-3 |
| 45 | 1,2-DICHLOROETHYLENE | 43 | 37 | 000540-59-0 |
| 45 | DDE, P,P'- | 43 | 27 | 000072-55-9 |
| 47 | ALUMINUM | 42 | 30 | 007429-90-5 |
| 48 | SODIUM | 41 | 32 | 007440-23-5 |
| 48 | CHLOROBENZENE | 41 | 31 | 000108-90-7 |
| 48 | PENTACHLOROPHENOL | 41 | 30 | 000087-86-5 |
| 48 | BENZO(GHI)PERYLENE | 41 | 19 | 000191-24-2 |
| 52 | METALS, UNSPECIFIED | 40 | 27 | HZ0900-01-T |
| 53 | SELENIUM | 39 | 20 | 007782-49-2 |
| 53 | FLUORANTHENE | 39 | 19 | 000206-44-0 |
| 53 | PYRENE | 39 | 19 | 000129-00-0 |
| 56 | DIELDRIN | 38 | 22 | 000060-57-1 |
| 57 | 2-METHYLNAPHTHALENE | 36 | 21 | 000091-57-6 |
| 58 | DDD, P,P'- | 35 | 21 | 000072-54-8 |
| 58 | DIBENZOFURAN | 35 | 18 | 000132-64-9 |
| 60 | CYANIDE | 34 | 24 | 000057-12-5 |
| 61 | MAGNESIUM | 31 | 21 | 007439-95-4 |
| 61 | THALLIUM | 31 | 17 | 007440-28-0 |
| 63 | 1,2-DICHLOROETHENE, CIS- | 30 | 25 | 000156-59-2 |
| 63 | CHLORDANE | 30 | 22 | 000057-74-9 |
| 65 | ACETONE | 29 | 19 | 000067-64-1 |
| 65 | HEPTACHLOR EPOXIDE | 29 | 16 | 001024-57-3 |
| 67 | 2-BUTANONE | 28 | 20 | 000078-93-3 |
| 67 | SILVER | 28 | 16 | 007440-22-4 |
| 67 | FLUORENE | 28 | 14 | 000086-73-7 |
| 70 | ANTHRACENE | 27 | 11 | 000120-12-7 |
| 71 | BROMODICHLOROMETHANE | 26 | 22 | 000075-27-4 |
| 71 | CALCIUM | 26 | 22 | 007440-70-2 |
| 71 | DI-N-BUTYL PHTHALATE | 26 | 15 | 000084-74-2 |
| 74 | NITRATE | 25 | 21 | 014797-55-8 |
| 74 | ACENAPHTHENE | 25 | 11 | 000083-32-9 |
| 76 | 2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN | 24 | 18 | 001746-01-6 |
| 76 | AROCLOR 1254 | 24 | 17 | 011097-69-1 |
| 78 | PHENOL | 23 | 14 | 000108-95-2 |
| 78 | ACENAPHTHYLENE | 23 | 12 | 000208-96-8 |
| 78 | CARBAZOLE | 23 | 9 | 000086-74-8 |
| 81 | 1,1,2,2-TETRACHLOROETHANE | 22 | 17 | 000079-34-5 |
| 81 | BUTYL BENZYL PHTHALATE | 22 | 7 | 000085-68-7 |
| 83 | 1,2-DICHLOROPROPANE | 21 | 17 | 000078-87-5 |
| 83 | AROCLOR 1260 | 21 | 13 | 011096-82-5 |
| 83 | PESTICIDES, UNSPECIFIED | 21 | 13 | HZ1200-01-T |
| 86 | 1,1,2-TRICHLOROETHANE | 20 | 17 | 000079-00-5 |
| 86 | POTASSIUM | 20 | 16 | 007440-09-7 |
| 86 | ASBESTOS | 20 | 10 | 001332-21-4 |
| 86 | STYRENE | 20 | 10 | 000100-42-5 |
| 90 | CHLOROMETHANE | 19 | 11 | 000074-87-3 |
| 90 | CRESOL, PARA- | 19 | 10 | 000106-44-5 |
| 92 | CHLORODIBROMOMETHANE | 17 | 14 | 000124-48-1 |
| 92 | DI-N-OCTYL PHTHALATE | 17 | 12 | 000117-84-0 |
| 92 | ALDRIN | 17 | 7 | 000309-00-2 |
| 92 | HEPTACHLOR | 17 | 6 | 000076-44-8 |
| 96 | 1,4-DICHLOROBENZENE | 16 | 8 | 000106-46-7 |
| 97 | TRICHLOROETHANE | 15 | 12 | 025323-89-1 |
| 97 | 1,2,4-TRIMETHYLBENZENE | 15 | 3 | 000095-63-6 |
| 99 | HEAVY METALS, UNSPECIFIED | 14 | 12 | HZ0900-02-T |
| 99 | BORON | 14 | 10 | 007440-42-8 |
| 99 | CHROMIUM, HEXAVALENT | 14 | 9 | 018540-29-9 |
| 99 | DIOXINS, UNSPECIFIED | 14 | 9 | HZ0400-05-T |
| 99 | HEXACHLOROBENZENE | 14 | 9 | 000118-74-1 |
| 99 | CARBON DISULFIDE | 14 | 8 | 000075-15-0 |
(104 substances are shown because 6 were found at 14 sites and
tie for 99th)
ALL Sites = all sites with ATSDR activities
NPL Sites = current and former sites on the National Priorities
List
CAS Number = Chemical Abstracts Service registry number
Summary Statistics for This Aug. 31, 1999 HazDat Analysis:
| All Sites | NPL Sites | |
|---|---|---|
| Number of Sites/Events in HazDat | 3,873 | 1,529 |
| Number of Public Health Assessments (PHAs) | 2,151 | 1,524 |
| Number of Sites/Events with CEPs | 864 | 606 |
| Number of CEP records (incidents) in HazDat | 11,557 | 8,136 |
| Number of CEP records (incidents) from PHAs | 8,611 | 6,833 |
| Total number of substances in CEPs | 567 | 458 |
