对来自美国各地的31种天然水进行了Jar测试。这些测试表明，大多数提供样品的公用事业公司将难以满足消毒剂/消毒副产品规则中的第一步总有机碳（TOC）去除要求。公用事业公司可能需要拟定的收益递减点替代性能标准，以满足强化混凝要求。高总有机碳和低碱度的水源最有可能满足拟议的第一步总有机碳要求。 那些TOC较低的人最有可能需要替代的绩效标准。包括23个参考文献、表格和图表。

Jar tests were performed on 31 natural waters from a variety of sources across the United States. These tests indicate that the majority of utilities supplying samples will have difficulty meeting the Step 1 total organic carbon (TOC) removal requirements in the Disinfectants/Disinfection Byproducts Rule. Utilities may need the proposed point of diminishing returns alternative performance criterion to achieve compliance with the enhanced coagulation requirement. Water sources with high TOC and low alkalinity were most likely to meet the proposed Step 1 TOC requirements. Those with low TOC were most likely to need the alternative performance criterion. Includes 23 references, tables, figures.