Dr. Jeff Ridal

Executive Director / Chief Research Scientist

613-936-6620 x 228

jridal [at] riverinstitute.ca



My educational background is in chemistry (BSc, Trent University, MSc, University of Ottawa) and oceanography (PhD, Dalhousie University). Post-doctoral positions at Canada’s National Water Research Institute and the University of Montreal brought me into the freshwater field. I joined the River Institute in 1995 as its first Research Scientist and became its Executive Director in 2004. I hold adjunct professorships with Queen’s University and the University of Ottawa. In 2008, I was named Canadian co-Chair of the Science Priority Committee for the International Joint Commission (IJC) of the United States and Canada. I have also served on the Commission’s Science Advisory Board since 2008.

Research Interests

My research predominantly involves water and sediment quality issues, including recreational water quality, fate and transport of contaminants, and food web bioaccumulation.


Moir, K. M., Hickey, M.B.C., Leavitt, P.R., Ridal, J.J., Cumming, B.F. 2018. Paleolimnological proxies reveal continued eutrophication issues in the St. Lawrence River Area of Concern. Manuscript to be submitted to the Journal of Great Lakes Research.

Bramburger AJ, Brown RS, Haley J, Ridal JJ. 2015. A new, automated rapid fluorometric method for the detection of Escherichia coli in recreational waters, Journal of Great Lakes Research, 41(1), 298–30.

Hodson PV, Norris K, Berquist M, Campbell LM, Ridal JJ. 2014 Mercury concentrations in amphipods and fish of the Saint Lawrence River (Canada) are unrelated to concentrations of legacy mercury in sediments. Science of the Total Environment; 494-495:218-28.

Lessard CL, Poulain AJ, Ridal JJ, Blais JM. 2014. Dynamic mass balance model for mercury in the St. Lawrence River near Cornwall, Ontario, Canada. Science of the Total Environment; 500–501: 131–138.

Razavi, N.R., J.J. Ridal, W. de Wit, M.B.C. Hickey, L.M. Campbell and P.V. Hodson. 2013. Ebullition rates and mercury concentrations in St. Lawrence River sediments and a benthic invertebrate. Environmental Toxicology and Chemistry. 32 (4): 857–865.

Fathi, M., J.J. Ridal, D.R.S. Lean, and J.M. Blais 2013. Factors affecting distributions of total and methyl mercury in contaminated sediments of the St. Lawrence River near Cornwall, Ontario. Journal of Great Lakes Research 39:66–73

Lessard, C.L., A.J. Poulain, J.J. Ridal, J.M. Blais. 2013. Steady-state mass balance model for mercury in the St. Lawrence River near Cornwall, Ontario, Canada. Environmental Pollution 174:  229-235.

Ridal, J.J., M.B.C. Hickey, J. Marty and S.P. Bhavsar. 2012. Assessing the fish consumption beneficial use impairment in the Bay of Quinte, Aquatic Ecosystem Health & Management 15:4, 453-563.

Avramescua M-L, E. Yumvihoze, H. Hintelmann, J.J. Ridal, D. Fortin, D.R.S.Lean. 2011. Biogeochemical factors influencing net mercury methylation in contaminated freshwater sediments from the St. Lawrence River in Cornwall, Ontario, Canada. Science of the Total Environment.409: 968–978.