Outhouse Beach is a saltwater beach in Guam County, Guam. Across 498 bacteria samples collected between 2021 and 2026 at nearby monitoring stations, it earns a Beach Safety Grade of A — Excellent.
About 0.6% of samples at Outhouse 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 almost never crossed here over the monitored period. Bacteria samples almost never exceed the safe-swimming threshold.
In the most recent full reporting year, Outhouse Beach was under a swimming advisory for about 13% of its monitored beach days — a useful gauge of how often problems recur here beyond any single sample.