I can’t even bring myself to make a smartass remark about this. Now we know what was killing all those fish - cyanide. And apparently (it’s a little fuzzy) it may even be in the local drinking water. From Matt:
The Environmental Protection Agency identified a Merck and Co. Inc. research facility in suburban Philadelphia as the source of a cyanide-related discharge that killed more than 1,000 fish in the Wissahickon Creek last week.
According to officials in EPA’s mid-Atlantic region, a representative from Merck notified the EPA Tuesday that about 25 gallons of potassium thiocyanate was released into the sewer system on June 13 from a vaccine research pilot plant in West Point, Pa.
Merck spokeswoman Connie Wickersham said the discharge was not in keeping with company’s policies governing the disposal of chemicals.
Heads should roll.

This reminds me of the plot of John Sayles last movie, SILVER CITY.
Imagine the children who play around the creek, such as I did years ago in Upper Darby, finding out later on that Naylors Run was contaminated with PCB’s from Haverford.
Heads should roll.