Bill Wolfe posted a summary of a new report by the NJ DEP on declining water quality in NJ. UNfortunately I cannot get the link to the DEP report to work right now. But Wolfe reports that the DEP lists over 1,000 streams for which water quality is impaired.
(I don't know if the Pequest, pictured above, is on the list or is one of the remaining clean ones. But its reputation as a trout stream and great place for hotdogs is strong.)