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• Summary Statistics for HazDat Analysis

Rank	Substance Name	ALL Sites	NPL Sites	CAS Number
1	LEAD	431	267	007439-92-1
2	TRICHLOROETHYLENE	363	286	000079-01-6
3	ARSENIC	341	208	007440-38-2
4	TETRACHLOROETHYLENE	280	207	000127-18-4
5	BENZENE	210	137	000071-43-2
6	CADMIUM	207	136	007440-43-9
7	VOLATILE ORGANIC COMPOUNDS N.O.S.	193	132	HZ1900-01-T
7	CHROMIUM	193	129	007440-47-3
9	POLYCHLORINATED BIPHENYLS	177	116	001336-36-3
10	MERCURY	167	93	007439-97-6
11	MANGANESE	164	95	007439-96-5
12	ZINC	158	95	007440-66-6
13	COPPER	143	83	007440-50-8
14	1,1,1-TRICHLOROETHANE	135	110	000071-55-6
15	CHLOROFORM	124	92	000067-66-3
16	BENZO(A)PYRENE	122	58	000050-32-8
17	1,1-DICHLOROETHENE	117	96	000075-35-4
17	POLYCYCLIC AROMATIC HYDROCARBONS	117	79	130498-29-2
19	NICKEL	112	70	007440-02-0
20	METHYLENE CHLORIDE	111	73	000075-09-2
20	TOLUENE	111	68	000108-88-3
22	ANTIMONY	108	69	007440-36-0
23	VINYL CHLORIDE	103	84	000075-01-4
24	BARIUM	102	56	007440-39-3
25	1,2-DICHLOROETHANE	96	77	000107-06-2
26	DI(2-ETHYLHEXYL)PHTHALATE	91	59	000117-81-7
26	METALS N.O.S.	91	57	HZ0900-01-T
28	1,1-DICHLOROETHANE	90	77	000075-34-3
29	IRON	88	56	007439-89-6
29	VANADIUM	88	48	007440-62-2
31	BENZO(A)ANTHRACENE	87	43	000056-55-3
32	CHRYSENE	86	41	000218-01-9
33	CARBON TETRACHLORIDE	83	55	000056-23-5
34	BERYLLIUM	82	42	007440-41-7
35	BENZO(B)FLUORANTHENE	79	32	000205-99-2
36	PHENANTHRENE	78	33	000085-01-8
37	NAPHTHALENE	77	40	000091-20-3
38	BENZO(K)FLUORANTHENE	74	32	000207-08-9
39	ETHYLBENZENE	73	44	000100-41-4
40	INDENO(1,2,3-CD)PYRENE	70	30	000193-39-5
41	XYLENES, TOTAL	69	39	001330-20-7
42	DIBENZO(A,H)ANTHRACENE	65	27	000053-70-3
43	PENTACHLOROPHENOL	64	41	000087-86-5
44	DIELDRIN	63	34	000060-57-1
44	COBALT	63	29	007440-48-4
44	THALLIUM	63	29	007440-28-0
47	ALUMINUM	62	41	007429-90-5
48	DDT, P,P'-	59	37	000050-29-3
48	SODIUM	59	35	007440-23-5
50	BENZO(GHI)PERYLENE	55	21	000191-24-2
51	SELENIUM	53	22	007782-49-2
52	DDE, P,P'-	52	32	000072-55-9
53	1,2-DICHLOROETHENE, TRANS-	51	49	000156-60-5
54	1,2-DICHLOROETHYLENE	49	41	000540-59-0
55	CHLOROBENZENE	48	35	000108-90-7
55	2-METHYLNAPHTHALENE	48	22	000091-57-6
55	PYRENE	48	19	000129-00-0
55	FLUORANTHENE	48	18	000206-44-0
59	HEPTACHLOR EPOXIDE	46	22	001024-57-3
60	DDD, P,P'-	45	26	000072-54-8
60	CYANIDE	45	24	000057-12-5
62	PESTICIDES N.O.S.	44	26	HZ1200-01-T
63	CHLORDANE	42	29	000057-74-9
64	MAGNESIUM	41	24	007439-95-4
65	SILVER	40	19	007440-22-4
66	1,2-DICHLOROETHENE, CIS-	39	29	000156-59-2
66	DIBENZOFURAN	39	18	000132-64-9
68	ACETONE	36	21	000067-64-1
68	ASBESTOS	36	14	001332-21-4
70	AROCLOR 1260	34	21	011096-82-5
70	FLUORENE	34	13	000086-73-7
72	BROMODICHLOROMETHANE	33	24	000075-27-4
72	DIOXINS N.O.S.	33	22	HZ0400-05-T
74	CALCIUM	32	24	007440-70-2
74	AROCLOR 1254	32	23	011097-69-1
74	NITRATE	32	23	014797-55-8
74	2-BUTANONE	32	22	000078-93-3
74	ALDRIN	32	12	000309-00-2
79	2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN	31	22	001746-01-6
79	ANTHRACENE	31	9	000120-12-7
79	CARBAZOLE	31	9	000086-74-8
82	DI-N-BUTYL PHTHALATE	30	13	000084-74-2
83	STYRENE	28	13	000100-42-5
83	ACENAPHTHYLENE	28	11	000208-96-8
83	1,4-DICHLOROBENZENE	28	10	000106-46-7
83	ACENAPHTHENE	28	9	000083-32-9
83	BUTYL BENZYL PHTHALATE	28	7	000085-68-7
88	1,1,2,2-TETRACHLOROETHANE	27	20	000079-34-5
88	1,2-DICHLOROPROPANE	27	20	000078-87-5
88	HEPTACHLOR	27	9	000076-44-8
88	1,2,4-TRIMETHYLBENZENE	27	5	000095-63-6
92	1,1,2-TRICHLOROETHANE	26	21	000079-00-5
92	POTASSIUM	26	19	007440-09-7
92	PHENOL	26	15	000108-95-2
95	CHLOROMETHANE	25	14	000074-87-3
95	HEXACHLOROCYCLOHEXANE, GAMMA-	25	13	000058-89-9
97	CRESOL, PARA-	23	8	000106-44-5
98	BORON	22	14	007440-42-8
98	CHROMIUM, HEXAVALENT	22	14	018540-29-9
98	METHYL ISOBUTYL KETONE	22	13	000108-10-1

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;
PHA = Public Health Assessment

Summary Statistics for this October 2005 HazDat Analysis:

	All Sites	NPL Sites
Number of Sites/Events in HazDat	5,256	1,674
Number of Public Health Assessments (PHAs)	2,364	1,619
Number of Sites/Events with CEPs	1,306	767
Number of CEP records (incidents) in HazDat	16,821	10,398
Number of CEP records (incidents) from PHAs	11,284	9,490
Total number of substances in CEPs	702	497

This page was updated on 12/04/2007