Trinchera Beach, East HagåTñA Bay is a saltwater beach in Guam County, Guam. Across 1,000 bacteria samples collected between 2021 and 2026 at nearby monitoring stations, it earns a Beach Safety Grade of C — Fair.
About 7% of samples at Trinchera Beach, East HagåTñA 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 sometimes crossed here over the monitored period. Bacteria samples occasionally exceed the safe-swimming threshold — check the latest advisory before swimming.
The evidence behind this grade is deep for a beach page: 1,000 results from 2 monitoring stations, spanning 2021 to 2026. Enough sampling, from enough places, over enough seasons that one bad week can't drive the letter.
In the most recent full reporting year, Trinchera Beach, East HagåTñA Bay was under a swimming advisory for about 16% of its monitored beach days — a useful gauge of how often problems recur here beyond any single sample.