Data used in the analysis is available as a single merged, comma delimited text file with the following data columns: 1.NO3: nitrate concentrations (mg N L-1) 2.NH4: ammonium concentrations (mg N L-1) 3.DOC: dissolved or total organic carbon concentrations (mg C L-1) 4.Redox: Redox potential (mV) 5.DO: Dissolved oxygen concentration (mg L-1) 6.Data Source: indicated by number, source citation and description provided in the Supplemental Material. 7. System: Streams & Rivers, Groundwaters, Lakes, Wetland surface waters, wetland soil solution