Davis Island Beach is a saltwater beach in Hillsborough County, Florida. Across 2,455 bacteria samples collected between 2021 and 2025 at nearby monitoring stations, it earns a Beach Safety Grade of F — Failing.
About 30% of samples at Davis Island Beach exceeded the EPA Beach Action Value of 104 CFU/100 mL for Enterococcus — the threshold at which water managers typically post a swimming advisory. In practice that means the safe-swimming limit was frequently crossed here over the monitored period. Bacteria samples exceed the safe-swimming threshold a large share of the time — this beach flags advisories often.
The evidence behind this grade is deep for a beach page: 2,455 results from 36 monitoring stations, spanning 2021 to 2025. Enough sampling, from enough places, over enough seasons that one bad week can't drive the letter.
In the most recent full reporting year, Davis Island Beach was under a swimming advisory for about 4% of its monitored beach days — a useful gauge of how often problems recur here beyond any single sample.