2004年，消毒副产品（DBP）规则将要求对地表水进行少量过滤 工厂应符合0.080 mg/L总三卤甲烷（TTHM）的规定水平，以及 0.060 mg/L卤乙酸（HAA5）。根据这项规定，小型地表水过滤厂 服务于500至10000人的工厂将需要每季度采集样本，并在过滤设备上进行过滤 服务少于500人的员工需要每年采集一次样本。 确定DBP规则对宾夕法尼亚州小型地表水的全面影响 宾夕法尼亚州农业部（Pennsylvania Department of National of the Pennsylvania）表示，过滤厂服务的人口少于10000人 环境保护部（department）在全州167家工厂采集了样本，以供研究 2000年和2001年夏季，TTHM和156株植物进行HAA5分析。 2001年，29 对过滤植物进行了TTHM测试，对23株植物进行了HAA5测试。这些过滤 由于植物超过了最高污染物水平的80%，因此对其进行了重新测试 为了TTHM。 只要有可能，目标就是收集TTHM和HAA5样本集。这意味着 TTHM和HAA5样本集在同一时间和地点收集。此外，样品 在分布中最长停留时间的位置收集。部门的 实验室局在这两个夏天对这些样本进行了分析。 结果表明，TTHM是主要的污染物。大约28 宾夕法尼亚州的小型地表水过滤厂超过80%的 最大污染物水平（MCL）。这些过滤设备可能需要协助才能符合要求 未来TTHM的MCL。小型地表水过滤厂的TTHM水平 类似于中型和大型过滤装置中的过滤装置。 小型地表水过滤厂的HAA5水平与 中型和大型过滤设备。在156家工厂中，有四家工厂超过80家 MCL的百分比，并且可能难以遵守HAA5的未来MCL。 相比之下，47%的过滤设备的TTHM水平低于0.04 毫克每升水（mg/L）和0.03 mg/L的HAA5水平。这些系统可能 符合DBP规则规定的减少TTHM和HAA5监测的条件。 采样计划的结果为部门工作人员提供了水质信息 条例生效前的信息。它还确定了过滤厂可能有 可能超过DBP规则中规定的MCL。因此，部门工作人员将 有更多时间与过滤厂员工合作，通过操作和/或沟通解决问题 基础设施改善。如果事先没有TTHM和HAA5数据，过滤设备可能会 应对措施是对治疗进行不适当的调整，例如降低消毒剂水平和 破坏微生物病原体的灭活。此外，这是目前唯一的 全州范围内对澳大利亚小型地表水过滤厂TTHM和HAA5水平的研究 宾西法尼亚州和美国可能会为其他州在消毒方面的预期创造条件 副产品。 包括5个参考文献、表格、图表。

In 2004, the Disinfection Byproducts (DBP) Rule will require small surface water filtration plants to comply with the regulated levels of 0.080 mg/L total trihalomethanes (TTHM) and 0.060 mg/L haloacetic acids (HAA5). Under this regulation, small surface water filtration plants that serve 500 to 10,000 people will be required to take samples quarterly and filtration plants serving less than 500 people will be required to take an annual sample. To determine the full impact of the DBP Rule on Pennsylvania's small surface water filtration plants serving populations of less than 10,000, the Pennsylvania Department of Environmental Protection (department) collected samples at 167 plants across the state for TTHM and 156 plants for HAA5 analysis during the summers of 2000 and 2001. In 2001, 29 filtration plants were retested for TTHM and 23 plants were retested for HAA5. These filtration plants were retested due to their exceedence of 80 percent of the maximum contaminant level for TTHM. Whenever possible, the goal was to collect TTHM and HAA5 sample sets. This means that the TTHM and HAA5 sample sets were collected at the same time and location. In addition, samples were collected at the location of maximum residence time in the distribution. The department's Bureau of Laboratories performed the analysis on these samples during both summers. The results identify TTHM as the main contaminant of concern. Approximately 28 percent of Pennsylvania's small surface water filtration plants exceeded 80 percent of the Maximum Contaminant Level (MCL). These filtration plants may need assistance to comply with the future MCL for TTHM. The levels of TTHM in small surface water filtration plants were similar to those in medium and large filtration plants. The levels of HAA5 in small surface water filtration plants were similar to those of the medium and large filtration plants. Four of the filtration plants out of 156 plants exceeded 80 percent of the MCL and may have trouble complying with the future MCL for HAA5. By contrast, 47 percent of the filtration plants were under the TTHM level of 0.04 milligrams per liter of water (mg/L) and the HAA5 level of 0.03 mg/L. These systems may be eligible for reduced TTHM and HAA5 monitoring as outlined under the DBP Rule. The results of the sampling program provided department staff with water quality information before the regulation takes effect. It also identified filtration plants that could have a potential to exceed the MCL as specified in the DBP Rule. Thus, department staff will have more time to work with the filtration plant staff to resolve problems through operational and/or infrastructure improvements. Without TTHM and HAA5 data beforehand, filtration plants may respond with inappropriate adjustments to treatment such as reducing disinfectant levels and compromise inactivation of microbial pathogens. Furthermore, this is currently the only statewide study on the levels of TTHM and HAA5 in small surface water filtration plants in Pennsylvania and may set the stage on what other states can expect in terms of disinfection byproducts. Includes 5 references, tables, figures.