1991年和1992年，17个州和地区报告了34起与饮用水有关的疾病暴发，估计有17464人受到影响。一种原生动物寄生虫（蓝氏贾第鞭毛虫或隐孢子虫）被确定为11次暴发中7次暴发的病原；其余四人是由于甲型肝炎、宋内志贺氏菌或化学物质引起的。缺乏治疗或治疗不足是暴发的主要原因，大多数（76%）与井水有关。此外，八个州报告了11起与无意摄入娱乐用水有关的胃肠炎暴发。其中6起暴发由贾第虫或隐孢子虫引起。这种对水传播疾病的全国性监测持续了22年，有助于确定水系统的缺陷以及与疫情相关的病原体。包括36个参考文献、表格、图表。

For 1991 and 1992, 17 states and territories reported 34 outbreaks of disease associated with drinking water, which affected an estimated 17,464 people. A protozoal parasite (Giardia lamblia or Cryptosporidium) was identified as the etiologic agent for seven of the eleven outbreaks for which an agent was determined; the remaining four were due to hepatitis A, Shigella sonnei, or chemicals. A lack of treatment or inadequate treatment accounted for the majority of outbreaks, and most (76 percent) were associated with well water. In addition, eight states reported eleven outbreaks of gastroenteritis associated with unintentional ingestion of recreational water. Six of these outbreaks were caused by Giardia or Cryptosporidium. Ongoing for 22 years, this national surveillance of waterborne disease helps to identify deficiencies in water systems and the etiologic agents associated with outbreaks. Includes 36 references, tables, figures.