United Seamen's Service Beach (Uso Beach) is a saltwater beach in Guam County, Guam. Across 525 bacteria samples collected between 2021 and 2026 at nearby monitoring stations, it earns a Beach Safety Grade of B — Good.
About 4% of samples at United Seamen's Service Beach (Uso 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 rarely crossed here over the monitored period. Bacteria samples rarely exceed the safe-swimming threshold.
In the most recent full reporting year, United Seamen's Service Beach (Uso Beach) was under a swimming advisory for about 12% of its monitored beach days — a useful gauge of how often problems recur here beyond any single sample.
📍 13.4660, 144.6870 · Open in Google Maps. Coordinates mark the monitored shoreline, not a specific access point.
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Common questions
Frequently Asked Questions
United Seamen's Service Beach (Uso Beach) earns a Beach Safety Grade of B (Good), based on 525 bacteria samples where about 4% exceeded the EPA safe-swimming threshold. Always confirm the current advisory before swimming, especially after heavy rain.
Water samples near United Seamen's Service Beach (Uso Beach) are tested for Enterococcus, uploaded to the EPA Water Quality Portal. A sample above the Beach Action Value (104 CFU/100 mL) signals a higher risk of illness from swimming. BeachGrade summarizes multiple years of those results into one grade.
United Seamen's Service Beach (Uso Beach) is a saltwater beach in Guam County, Guam.
Beach inventory and advisory status from the U.S. EPA BEACON program; bacteria samples from the Water Quality Portal. The Beach Safety Grade summarizes multiple years of monitoring — see our methodology. Water quality changes quickly, especially after rain; always check the official state or county advisory before swimming. BeachGrade is informational and not a substitute for official public-health guidance.