| Waterborne disease outbreaks by water supply system | |||||
| Year | Community | Non- community | Individual | Total | Total cases |
| number | number | ||||
| 1971 | 8 | 8 | 4 | 20 | 5,184 |
| 1972 | 9 | 19 | 2 | 30 | 1,650 |
| 1973 | 6 | 16 | 3 | 25 | 1,762 |
| 1974 | 11 | 9 | 5 | 25 | 8,356 |
| 1975 | 6 | 16 | 2 | 24 | 10,879 |
| 1976 | 9 | 23 | 3 | 35 | 5,068 |
| 1977 | 14 | 18 | 2 | 34 | 3,860 |
| 1978 | 10 | 19 | 3 | 32 | 11,435 |
| 1979 | 24 | 13 | 8 | 45 | 9,841 |
| 1980 | 26 | 20 | 7 | 53 | 20,045 |
| 1981 | 14 | 18 | 4 | 36 | 4,537 |
| 1982 | 26 | 15 | 3 | 44 | 3,588 |
| 1983 | 30 | 9 | 4 | 43 | 21,036 |
| 1984 | 12 | 5 | 10 | 27 | 1,800 |
| 1985 | 7 | 14 | 1 | 22 | 1,946 |
| 1986 | 10 | 10 | 2 | 22 | 1,569 |
| 1987 | 8 | 6 | 1 | 15 | 22,149 |
| 1988 | 6 | 10 | 1 | 16 | 2,169 |
| 1989 | 6 | 6 | 1 | 13 | 2,670 |
| 1990 | 6 | 7 | 2 | 15 | 1,748 |
| 1991 | 2 | 13 | 0 | 15 | 12,960 |
| 1992 | 6 | 10 | 3 | 19 | 4,504 |
| 1993 | 9 | 4 | 5 | 18 | 404,190 |
| 1994 | 5 | 6 | 2 | 13 | 651 |
| 1995 | 8 | 7 | 1 | 16 | 2,375 |
| 1996 | 2 | 3 | 1 | 6 | 192 |
Sources: M.H. Kramer, B.L. Herwaldt, G.F. Craun, R.L. Calderon and D.D. Juranek, “Surveillance for Waterborne-Disease Outbreaks—United States, 1993-1994,” In CDC Surveillance Summaries, April 12, 1996, Morbidity and Mortality Weekly Report 42(SS-5) (U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, Atlanta, GA), pp. 7-8, and earlier reports in this series.
D.A. Levy, M.S. Bens, G.F. Craun, R.L. Calderon, and B.L. Herwaldt, “Surveillance for Waterborne-Disease Outbreaks—United States, 1995-1996,” In CDC Surveillance Summaries, December 11, 1998, Morbidity and Mortality Weekly Report 47(SS-5) (U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, Atlanta, GA).
Notes: The number of waterborne disease outbreaks and the number of affected people or cases reported to the Centers for Disease Control and Prevention and to the U.S. Environmental Protection Agency represents a fraction of the total number that occur. Therefore, these data should not be used to draw firm conclusions about the true incidence of waterborne disease outbreaks.
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