N.J. county’s wastewater shows COVID levels similar to last fall when cases surged Updated 2:03 PM; Facebook Share Bergen County’s program to test sewage for COVID-19 shows levels of the virus similar to those from last fall into winter, signaling a potential spike in cases for New Jersey’s most populous county as the state vies with the highest rate of coronavirus in the country. The wastewater testing program is able to predict spikes and drops in COVID infection as much as two weeks in advance, the Bergen County Executive’s Office said in a Tuesday announcement. As the Garden State finds itself in the throes of a third wave of the virus, officials cautioned residents to remain vigilant.