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1998年,美国水厂协会消毒委员会水质组调查了使用地下水和地面水的小型供水系统（服务人口≤10 000人）的消毒实施情况。结果显示97％地面水系统和86％地下水系统采用消毒工艺,94％地面水系统采用过滤工艺。虽然大多数供水系统能符合1阶段消毒剂/消毒副产物对总三卤甲烷的要求,但许多供水系统需更好地控制卤乙酸生成。1 地下水系统调查结果 208个地下水系统返回的调查表中,200个提供了详细资料。按现行美国国家环保局（EPA）的服务人口规模分类如下:25～100人,3个系统（1.5％）;101～500人,35个系统（17.5％）;501～3 300人,124个系统（62％）;3 301～10 000
In 1998, WSPA Water Quality Unit investigated the disinfection of small-scale water supply systems using groundwater and surface water (service population ≤ 10,000). The results show that 97% of the surface water system and 86% of the groundwater system disinfection process, 94% of the surface water system using filtration process. While most water supply systems meet the THM requirements for Phase 1 Disinfectant / Disinfection By-Products, many water systems require better control of haloacetate formation. 1 Groundwater System Survey Results Of the 208 groundwater system returned surveys, 200 provided detailed information. According to the current service size of the US Environmental Protection Agency (EPA), the breakdown is as follows: 25 to 100 persons, 3 systems (1.5%); 101 to 500 persons, 35 systems (17.5%); 501 to 3 300 persons; 124 System (62%); 3 301 ~ 10 000