| Characteristic | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type of standard violated | ||||||||||||||
| All health-based standards | 19.8 | 15.4 | 11.8 | 10.7 | 10.4 | 8.8 | 8.2 | 8.8 | 5.7 | 11.2 | 8.5 | 10.9 | 11.6 | 9.7 |
| Lead and copper | 2.8 | 1.8 | 2.1 | 1.8 | 1.9 | 1.7 | 1.6 | 1.2 | 1.1 | 0.8 | 0.6 | 0.9 | 0.8 | 0.4 |
| Coliforms | 8.6 | 7.2 | 4.1 | 4.4 | 3.6 | 3.0 | 3.2 | 3.0 | 2.2 | 2.6 | 2.9 | 3.5 | 3.2 | 2.7 |
| Chemical and radionuclide | 1.8 | 1.3 | 1.8 | 1.1 | 1.5 | 1.7 | 1.2 | 1.5 | 1.0 | 2.0 | 1.9 | 2.2 | 2.8 | 2.4 |
| Surface water treatment and filtration | 8.0 | 6.3 | 4.8 | 4.3 | 4.1 | 3.1 | 2.7 | 3.5 | 1.7 | 5.3 | 1.8 | 3.8 | 4.2 | 3.9 |
| Nitrate/nitrite | 0.3 | 0.1 | 0.2 | 0.2 | 0.3 | 0.6 | 0.2 | 0.5 | 0.1 | 0.5 | 0.3 | 0.1 | 0.1 | 0.5 |
| Disinfection byproducts | — | — | — | — | — | — | — | — | — | 1.4 | 2.8 | 2.4 | 2.6 | 1.4 |
| — Not available. | ||||||||||||||
| NOTE: A new standard for disinfection byproducts was adopted in 2001, and implementation began in 2002. Revisions to the standard for surface water treatment also took effect in 2002. No other revisions to the standards have taken effect during the period of trend data (beginning with 1993). Percentages are estimated. Data have been revised since previous publication in America's Children. | ||||||||||||||
| SOURCE: U.S. Environmental Protection Agency, Office of Water, Safe Drinking Water Information System. | ||||||||||||||
