The program monitors the waters along Oregon's coastline for the presence of fecal bacteria, and reports elevated levels to the public. Marine waters are tested for enterococcus, which is an indicator of the presence of other bacteria. Enterococcus has been shown to have a greater correlation in marine waters with swimming-associated illnesses than other bacterial organisms. Enterococcus is present in human and animal waste and can enter marine waters from a variety of sources such as streams and creeks, storm water runoff, animal and seabird waste, failing septic systems, sewage treatment plant spills, or boating waste.
 
If the test results for a beach are at or above 158 organisms/100 ml marine water, an advisory will be issued immediately and signage posted at the beach in question. The advisory and the sign(s) will remain in place until additional testing indicates that enterococcus levels have decreased to less than 158 organisms/100 ml marine water. Get related information at the EPA's Beach Program Website