 After the 2013 SCDHEC had issued emergency regulations the City of Charlotte discovered high levels of PCBs entering its sewage waste water treatment plants, where sewage is converted to sewage sludge.The city at first denied it had a problem, then admitted an "event" occurred in February 2014, and in April that the problem had occurred much earlier.The city stated that its very first test with a newly changed test method revealed very high PCB levels in its sewage sludge farm field fertilizer.