Recent Examples on the WebOne worrying sign is that each trawl decreased denitrification more than the previous trawl. Erik Stokstad, Science | AAAS, 3 Mar. 2020 Ultimately, officials say, Suffolk County needs recurring revenue to subsidize new sewers and individual denitrification units, whether a surcharge on water bills or some other tax. Lisa W. Foderaro, New York Times, 8 May 2017