Oregon Beach Monitoring Program: Bacterial exceedances in marine and freshwater creeks/outfall samples, October
C M Neumann1, A K Harding, J M Sherman
1Department of Public Health, 310 Waldo Hall, Oregon State University, Corvallis, OR 97331, USA. cathy.neumann@oregonstate.edu
Marine Pollution Bulletin
|May 16, 2006
Summary
Oregon beach water quality monitoring found enterococci bacteria exceedances at 3.2% of sites. Rainfall significantly impacted bacterial levels, especially in marine waters, indicating a need for continued water quality surveillance.
Area of Science:
- Environmental Microbiology
- Water Quality Assessment
- Public Health
Background:
- Enterococci are indicator organisms for fecal contamination in recreational waters.
- Oregon beaches are designated recreational areas requiring water quality monitoring.
- Previous studies highlight the impact of environmental factors on bacterial levels.
Purpose of the Study:
- To assess enterococci levels at Oregon's marine and freshwater beaches.
- To identify the frequency and magnitude of bacterial exceedances.
- To investigate the relationship between rainfall and bacterial contamination.
Main Methods:
- Collected 3086 water samples from 52 Oregon beaches (Oct 2002-Apr 2005).
- Analyzed samples for enterococci using most probable number (MPN) method.
- Correlated bacterial densities with rainfall data at select beaches.
Main Results:
- 3.2% of samples (99/3086) exceeded the 158 MPN/100 mL threshold at 21 beaches.
- Freshwater sites showed higher exceedance rates (12.9%) than marine sites (2.6%).
- Rainfall was strongly correlated with bacterial densities, explaining up to 50% of variation at two beaches.
Conclusions:
- Enterococci exceedances occur at Oregon beaches, particularly after rainfall events.
- Freshwater environments exhibit higher susceptibility to bacterial contamination.
- Further monitoring is recommended to understand and manage bacterial contamination risks.
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