This paper utilizes a 70% drop in ambient water quality monitoring to show that point sources increase their pollutant discharges in the posttreatment period. Our sample examines 264 major municipal plants in Pennsylvania, South Carolina, and Virginia from 1990 to 2010. Results show that plants in the treatment group increase the relative quantity and concentration discharges of biological oxygen demand between 18% and 39% in contrast to the control group. Estimated coefficients are large in magnitude given prior evidence on the inflexibility of water pollution abatement levels relative to discharge limits. (JEL Q52, Q53)

中文翻译：

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水质监测对工厂级污染的影响：来自《清洁水法》的证据

本文利用环境水质监测下降 70% 来表明点源在后处理阶段增加了其污染物排放。我们的样本检查了 1990 年至 2010 年宾夕法尼亚州、南卡罗来纳州和弗吉尼亚州的 264 家主要市政工厂。结果表明，与对照组相比，处理组植物增加了 18% 至 39% 的生物需氧量的相对数量和浓度排放团体。鉴于先前有证据表明水污染减排水平相对于排放限制的不灵活性，估计系数的幅度很大。(JEL Q52, Q53)