Identifying and eliminating sources of recreational water quality degradation along an urban coast

Journal of Environmental Quality
By: , and 

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Abstract

Restoration of highly degraded urban coastal waters often requires large-scale, complex projects, but in the interim, smaller-scale efforts can provide immediate improvements to water quality conditions for visitor use. We examined short-term efforts to improve recreational water quality near the Grand Calumet River (GC) in the Laurentian Great Lakes. Identified as an Area of Concern (AOC) by the International Joint Commission, the GC has experienced years of industrial and municipal waste discharges, and as a result, coastal beaches have some of the highest rates of beach closings (>70%) in the United States. Project objectives were to identify sources of microbial contamination and to evaluate a short-term management solution to decrease beach closings: during 2015 (partial) and 2016 (season-long), canines were used to deter gull presence. Water samples were analyzed for Escherichia coli in 2015 and 2016, and fecal sources were evaluated using microbial source tracking markers (2015): human (Bacteroides HF183, Methanobrevibacter nifH), gull (Gull2), and dog (DogBact). Hydrometeorological conditions were simultaneously measured. Results indicated that human, gull, and canine fecal sources were present, with gulls being the dominant source. Escherichia coli densities were highly correlated with number of gulls present, Gull2 marker, and turbidity. Gull deterrence decreased E. coli and Gull2 marker detection during 2015, but numbers rebounded after program completion. The full-season program in 2016 resulted in lower E. coli densities and fewer beach closings. Large-scale restoration efforts are underway at this location, but short-term, small-scale projects can be useful for reducing beach closings and restoring ecosystem services.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Identifying and eliminating sources of recreational water quality degradation along an urban coast
Series title Journal of Environmental Quality
DOI 10.2134/jeq2017.11.0461
Volume 47
Issue 5
Year Published 2018
Language English
Publisher American Society of Agronomy, Crop Science Society of America, Soil Science Society of America
Contributing office(s) Great Lakes Science Center
Description 9 p.
First page 1042
Last page 1050
Country United States
State Indiana
Other Geospatial Lake Michigan