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Coco Plum Beach (Marathon) water quality today
Official bacteria testing, in plain words.
WATER QUALITY RIGHT NOW
Optimal
Latest test: pristine (1 cfu/100mL).
Sampled Sep 8 · FL DOH Healthy Beaches, conditions may have changed since
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What this means for swimming
Enterococci is the indicator bacteria official beach programs test for, typically every week or two. Under 35 per 100 mL is the all-clear band; 71 and above usually triggers a swim advisory. Counts move week to week, and heavy rain can spike them for a day or two as runoff drains.
ShoreScore folds this reading into Coco Plum Beach (Marathon)'s overall 0-100 score alongside live weather, surf, UV, seaweed reports, and storm radar, so one number tells you whether it's worth the trip.
Recent tests
7 of the last 10 official tests landed in the all-clear band. Shown oldest to newest.
Water quality at nearby beaches
Marathon (Sombrero)Islamorada (Anne’s Beach)Bahia HondaHarry Harris Park (Key Largo South)Key Largo (Pennekamp)All beaches
Also for Coco Plum Beach (Marathon): today's seaweed and sargassum report
Source: Florida Department of Health Healthy Beaches sampling, checked daily. Informational only: posted signs and lifeguard guidance at the beach are the official word.