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• Summary Statistics for HazDat Analysis

Rank	Substance Name	ALL Sites	NPL Sites	CAS Number
1	LEAD	476	284	007439-92-1
2	ARSENIC	405	231	007440-38-2
3	TRICHLOROETHYLENE	391	301	000079-01-6
4	TETRACHLOROETHYLENE	309	219	000127-18-4
5	BENZENE	242	147	000071-43-2
6	CADMIUM	236	151	007440-43-9
7	CHROMIUM	216	138	007440-47-3
8	MERCURY	189	100	007439-97-6
9	VOLATILE ORGANIC COMPOUNDS N.O.S.	185	124	HZ1900-01-T
10	POLYCHLORINATED BIPHENYLS	184	117	001336-36-3
11	MANGANESE	180	101	007439-96-5
12	ZINC	170	102	007440-66-6
13	COPPER	165	96	007440-50-8
14	BENZO(A)PYRENE	139	68	000050-32-8
15	1,1,1-TRICHLOROETHANE	134	108	000071-55-6
16	CHLOROFORM	126	93	000067-66-3
17	ANTIMONY	124	80	007440-36-0
17	NICKEL	124	75	007440-02-0
19	1,1-DICHLOROETHENE	122	98	000075-35-4
19	VINYL CHLORIDE	122	95	000075-01-4
21	POLYCYCLIC AROMATIC HYDROCARBONS	118	78	130498-29-2
22	METHYLENE CHLORIDE	116	73	000075-09-2
23	TOLUENE	114	68	000108-88-3
24	BARIUM	110	60	007440-39-3
25	BENZO(A)ANTHRACENE	102	50	000056-55-3
26	1,2-DICHLOROETHANE	99	78	000107-06-2
26	IRON	99	62	007439-89-6
26	VANADIUM	99	53	007440-62-2
29	DI(2-ETHYLHEXYL)PHTHALATE	96	64	000117-81-7
30	BENZO(B)FLUORANTHENE	94	39	000205-99-2
31	CHRYSENE	93	45	000218-01-9
32	1,1-DICHLOROETHANE	92	75	000075-34-3
33	CARBON TETRACHLORIDE	90	59	000056-23-5
34	METALS N.O.S.	88	55	HZ0900-01-T
35	BERYLLIUM	86	44	007440-41-7
36	BENZO(K)FLUORANTHENE	83	37	000207-08-9
36	PHENANTHRENE	83	35	000085-01-8
38	INDENO(1,2,3-CD)PYRENE	82	36	000193-39-5
39	NAPHTHALENE	81	41	000091-20-3
40	DIBENZO(A,H)ANTHRACENE	75	32	000053-70-3
41	DIELDRIN	74	37	000060-57-1
42	ETHYLBENZENE	73	43	000100-41-4
43	XYLENES, TOTAL	72	39	001330-20-7
44	THALLIUM	71	36	007440-28-0
45	ALUMINUM	70	43	007429-90-5
46	PENTACHLOROPHENOL	68	43	000087-86-5
47	DDT, P,P'-	66	41	000050-29-3
47	COBALT	66	30	007440-48-4
49	BENZO(GHI)PERYLENE	63	25	000191-24-2
50	SODIUM	61	34	007440-23-5
51	SELENIUM	58	24	007782-49-2
52	DDE, P,P'-	57	35	000072-55-9
53	1,2-DICHLOROETHENE, TRANS-	54	51	000156-60-5
54	1,2-DICHLOROETHENE, CIS-	52	38	000156-59-2
55	1,2-DICHLOROETHYLENE	51	43	000540-59-0
55	FLUORANTHENE	51	19	000206-44-0
57	2-METHYLNAPHTHALENE	50	22	000091-57-6
57	PYRENE	50	20	000129-00-0
59	DDD, P,P'-	49	29	000072-54-8
59	HEPTACHLOR EPOXIDE	49	22	001024-57-3
61	CHLOROBENZENE	47	34	000108-90-7
62	CHLORDANE	45	31	000057-74-9
62	CYANIDE	45	23	000057-12-5
64	AROCLOR 1260	43	26	011096-82-5
64	SILVER	43	20	007440-22-4
66	MAGNESIUM	41	22	007439-95-4
66	DIBENZOFURAN	41	19	000132-64-9
68	PESTICIDES N.O.S.	40	22	HZ1200-01-T
68	ASBESTOS	40	12	001332-21-4
70	AROCLOR 1254	38	26	011097-69-1
71	ACETONE	37	20	000067-64-1
71	ALDRIN	37	14	000309-00-2
73	BROMODICHLOROMETHANE	36	26	000075-27-4
73	FLUORENE	36	13	000086-73-7
75	2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN	35	26	001746-01-6
76	2-BUTANONE	34	22	000078-93-3
77	NITRATE	33	24	014797-55-8
77	DIOXINS N.O.S.	33	22	HZ0400-05-T
77	CARBAZOLE	33	10	000086-74-8
77	ANTHRACENE	33	9	000120-12-7
81	CALCIUM	32	23	007440-70-2
81	ACENAPHTHYLENE	32	12	000208-96-8
83	1,2,4-TRIMETHYLBENZENE	31	6	000095-63-6
84	DI-N-BUTYL PHTHALATE	30	13	000084-74-2
84	HEPTACHLOR	30	11	000076-44-8
86	1,1,2-TRICHLOROETHANE	28	22	000079-00-5
86	1,1,2,2-TETRACHLOROETHANE	28	20	000079-34-5
86	BORON	28	15	007440-42-8
86	STYRENE	28	12	000100-42-5
86	1,4-DICHLOROBENZENE	28	10	000106-46-7
86	ACENAPHTHENE	28	9	000083-32-9
86	BUTYL BENZYL PHTHALATE	28	7	000085-68-7
93	1,2-DICHLOROPROPANE	27	20	000078-87-5
94	HEXACHLOROCYCLOHEXANE, GAMMA-	26	14	000058-89-9
95	POTASSIUM	25	17	007440-09-7
95	DIBROMOCHLOROMETHANE	25	16	000124-48-1
95	CHLOROMETHANE	25	14	000074-87-3
95	PHENOL	25	14	000108-95-2
99	CHROMIUM, HEXAVALENT	24	14	018540-29-9
100	CRESOL, PARA-	23	8	000106-44-5

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 2007 HazDat Analysis:

	All Sites	NPL Sites
Number of Sites/Events in HazDat	5,501	1,689
Number of Public Health Assessments (PHAs)	2,414	1,641
Number of Sites/Events with CEPs	1,444	802
Number of CEP records (incidents) in HazDat	17,808	10,724
Number of CEP records (incidents) from PHAs	11,634	9,668
Total number of substances in CEPs	715	498

This page was updated on 01/09/2008