It is well known that stormwater gathers a variety of pollutants as it flows across the landscape and even through stormwater drainage systems. See, for example, http://cfpub.epa.gov/npdes/home.cfm?program_id=6 and http://www.epa.gov/owow_keep/NPS/index.html . In NRDC v. County of Los Angeles, Ninth...

In 1983, the City sought to restore a long closed well for use as a drinking water resource. It received complaints re taste and odor. The State of Nebraska and EPA investigated, and ultimately the site was added to the NPL in 1986. EPA determined that the VOC contamination originated from seven source...