Popular Oakland County beach remains closed for Labor Day weekend
The beach at a popular state park has been closed for swimming since early August and will remain so for Labor Day weekend.
The beach at Seven Lakes State Park in Holly Township closed Aug. 5 because of elevated levels of E. coli bacteria.
In Waterford Township, Pontiac Lake Recreation Area’s beach reopened Wednesday, Aug. 27; it had been closed for almost a month because of E. coli readings.
Other smaller beaches across the county, many of them privately owned, have also been closed this summer. In addition to Seven Lakes, there were four beaches on the Oakland County Health Division’s list as of Friday.
To view the list, visit https://www.oakgov.com/home/showpublisheddocument/11972/638901678527381433.
Every summer, the Health Division routinely tests 100 public and private beaches, but that monitoring does not identify a source of E. coli contamination.
If levels are too high, a sign is posted and the beach is closed. It is then retested every weekday until an acceptable reading is reached and the beach reopens, said Mark Hansell, chief of Environmental Health Special Programs for the Oakland County Health Division.
Closed beaches prohibit swimming; they are generally open for walking and other activities.
Seven Lakes beach users posted on the park’s Facebook page that a large group of Canada geese that inhabit the area – and their droppings – are likely responsible for the closing.
The park’s administrative staff posted that they do the best they can to remove droppings from the beach.
But the Health Division doesn’t know the source of the E. coli contamination at Seven Lakes, Hansell said. Specialized testing showed it did not come from human waste, which can occur if there is a leak or other problem in a sewer or septic system.
“The Oakland County Health Division Lab does keep samples frozen for more analysis in partnership with other labs in the state that can run different genetic markers – goose, canine, ruminants, etc.,” he said in an email.
“Results from this process last year were primarily related to canine sources. But we do not know, and we may never know, the source from this season,” he said.
Last year, the county conducted a special study, in cooperation with several other entities, of beaches most troubled by E. coli contamination. They took 20 samples from nine lakes to determine the sources.
In 12 samples taken from seven lakes, dog waste was responsible. In the other eight samples, the source was undetectable. Geese and all warm-blooded animals carry E. coli in their guts; any wildlife could have been the source, Hansell said.
Dogs do not have to be on a beach to cause elevated E. coli readings. Waste left on lawns can wash into bodies of water, Hansell said.
The sample was small, as Oakland County has dozens of lakes with frequent closings every summer, he said.
Most E.coli strains cause no symptoms or only mild illness, but a few are responsible for serious health problems, Hansell said.
Monitored beaches have to meet the one-day standard of 300 E. coli colonies per 100 milliliters of water and the 30-day average of 130 colonies per 100 milliliters. The county’s list indicates whether each beach failed the one-day test or the 30-day test or both.
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