公用事业经理通常会决定 通过测量溶解的有机物 碳（DOC）或总有机碳浓度和 通过设定可接受的阈值来调节水质。虽然 这种定量方法通常是令人满意的 出现在藻类繁殖或暴雨期间， 当水的可生物降解有机成分可能增加时 戏剧性地本研究旨在提供 关于这些季节性事件中大肠菌群发生的答案。 这些结果证实了基因起源的重要作用 溶解性有机物对微生物稳定性的影响- 营养的 水，包括饮用水、稀释的河水 一场暴雨过后，海水被冲淡。进一步的 结果表明，低营养水具有同等的营养价值 从不同来源输送有机物的DOC浓度 来源，并可能部分通过治疗步骤， 允许暂时维持某些细菌的可培养性 大肠菌群。包括36个参考文献、表格、图表。

It is a common practice for utility managers to determine the organic matrix of water by measuring the dissolved organic carbon (DOC) or total organic carbon concentrations and regulating water quality by fixing acceptable thresholds. Although this quantitative approach is generally satisfactory, problems appear during periods of algal proliferation or heavy rainfall, when the water's biodegradable organic fraction may increase dramatically. This study was specifically designed to provide answers about coliform occurrence during these seasonal events. The results confirm the important effect of the origin of dissolved organic matter on the microbiological stability in low-nutritive waters, including drinking water, diluted river water after a heavy rainfall, and diluted algal bloom water. Further, the results indicate that low-nutritive waters with equivalent DOC concentrations conveying organic matter from different origins, and likely to partially pass through the treatment step, allowed the temporary maintenance of the culturability of some coliform bacteria. Includes 36 references, tables, figures.