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Marathon (Sombrero) water quality today
Official bacteria testing, in plain words.
WATER QUALITY RIGHT NOW
Optimal
Latest test: pristine (1 cfu/100mL).
Sampled Jul 14 · FL DOH Healthy Beaches, conditions may have changed since
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 Marathon (Sombrero)'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
4 of the last 5 official tests landed in the all-clear band.
Water quality at nearby beaches
Coco Plum Beach (Marathon)Bahia Honda SandspurBahia HondaIslamorada (Anne’s Beach)Harry Harris Park (Key Largo South)All beaches
Also for Marathon (Sombrero): 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.