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Interesting.

In Illinois, the top 10 "unsafe" beaches were considered unsafe for a range of 84-96% of sampling days. On average, Cook County beaches were considered unsafe for a staggering 83% of sampling days.

In California, the top 10 "unsafe" beaches had a wide range of unsafe sampling days, at 17-91%. The county with the highest % of unsafe sampling days was San Mateo County at 32%. LA County actually did quite well, with only 10% of sampling days being considered unsafe.