"Annual nitrogen concentrations of samples for 5 water quality monitoring stations along the St. Lawrence River, 2010 to 2023",,, ,,, Monitoring station,Year,Percent of samples above nitrogen guideline,Number of samples Wolfe Island,2010,42,24 Wolfe Island,2011,0,13 Wolfe Island,2012,7,30 Wolfe Island,2013,15,65 Wolfe Island,2014,29,28 Wolfe Island,2015,61,31 Wolfe Island,2016,68,63 Wolfe Island,2017,60,55 Wolfe Island,2018,44,48 Wolfe Island,2019,28,52 Wolfe Island,2020,27,11 Wolfe Island,2021,0,2 Wolfe Island,2022,28,39 Wolfe Island,2023,42,24 Carillon,2010,9,11 Carillon,2011,21,14 Carillon,2012,14,14 Carillon,2013,21,14 Carillon,2014,29,14 Carillon,2015,29,14 Carillon,2016,21,14 Carillon,2017,43,14 Carillon,2018,36,14 Carillon,2019,29,14 Carillon,2020,0,2 Carillon,2021,n/a,0 Carillon,2022,13,8 Carillon,2023,60,5 Lavaltrie,2010,100,12 Lavaltrie,2011,92,12 Lavaltrie,2012,83,12 Lavaltrie,2013,100,12 Lavaltrie,2014,92,12 Lavaltrie,2015,92,11 Lavaltrie,2016,83,12 Lavaltrie,2017,100,12 Lavaltrie,2018,100,12 Lavaltrie,2019,67,12 Lavaltrie,2020,100,2 Lavaltrie,2021,n/a,0 Lavaltrie,2022,63,8 Lavaltrie,2023,80,5 Saint-François,2010,93,15 Saint-François,2011,93,14 Saint-François,2012,100,7 Saint-François,2013,89,9 Saint-François,2014,89,9 Saint-François,2015,92,12 Saint-François,2016,100,16 Saint-François,2017,94,17 Saint-François,2018,94,17 Saint-François,2019,94,17 Saint-François,2020,n/a,0 Saint-François,2021,n/a,0 Saint-François,2022,100,8 Saint-François,2023,100,3 Québec,2010,47,17 Québec,2011,41,17 Québec,2012,44,16 Québec,2013,60,15 Québec,2014,53,17 Québec,2015,65,17 Québec,2016,59,17 Québec,2017,59,17 Québec,2018,41,17 Québec,2019,35,17 Québec,2020,0,2 Québec,2021,n/a,0 Québec,2022,25,8 Québec,2023,47,17 ,,, "Note: n/a: not applicable. For the purposes of this indicator, the nitrogen guideline is 0.65 mg N/L. Samples from the mouth of the Saint-François River from 2010-2020 were collected from May to September only.",,, Source: Environment and Climate Change Canada (2023),,, Available on the Environmental indicators website (www.canada.ca/environmental-indicators).,,,