20世纪60年代初，安大略省滑铁卢附近的一家石油回收厂在一系列泻湖中丢弃了酸性污泥，后来这些泻湖中充满了天然物质。现在，含油废物从侧面渗入池塘和溪流，并向下进入蓄水层，诱导渗透饮用水井终止于蓄水层。滑铁卢自治区采取了一些纠正措施；然而，还没有制定出一个长期、成本效益高的解决方案。包括数字。

In the early 1960s, an oil recovery plant near Waterloo, Ontario, discarded acid sludge in a series of lagoons that were later filled with native material. Now the oily waste is leaching laterally into a pond and stream as well as downward to the aquifer in which induced infiltration drinking water wells terminate. Some corrective measures have been undertaken by the Regional Municipality of Waterloo; however, a long-term, cost-effective solution to the problem has not yet been devised. Includes figures.