Toguan Bay is a saltwater beach in Guam County, Guam. Across 522 bacteria samples collected between 2021 and 2026 at nearby monitoring stations, it earns a Beach Safety Grade of F — Failing.
About 31% of samples at Toguan Bay 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.
In the most recent full reporting year, Toguan Bay was under a swimming advisory for about 35% of its monitored beach days — a useful gauge of how often problems recur here beyond any single sample.