Islamorada Library Beach Water Quality

Monroe County, Florida

Advisory

Health advisory: the state advises against swimming here until a retest comes back clean.

Latest test
Oct 20, 2026 (16 days ago)
Enterococci
74 per 100 mL
Past 12 months
12 of 20 tests Good, 6 Poor

Results over time

101001000Jan 27, 2026: 10 per 100 mL (Good)Feb 10, 2026: 31 per 100 mL (Good)Feb 24, 2026: <10 per 100 mL (Good)Mar 10, 2026: <10 per 100 mL (Good)Mar 24, 2026: 63 per 100 mL (Moderate)Apr 7, 2026: 161 per 100 mL (Poor)Apr 21, 2026: 10 per 100 mL (Good)May 5, 2026: 10 per 100 mL (Good)May 19, 2026: <10 per 100 mL (Good)Jun 2, 2026: 341 per 100 mL (Poor)Jun 16, 2026: 31 per 100 mL (Good)Jun 30, 2026: 269 per 100 mL (Poor)Jul 14, 2026: 683 per 100 mL (Poor)Jul 28, 2026: 31 per 100 mL (Good)Aug 11, 2026: 52 per 100 mL (Moderate)Aug 25, 2026: <10 per 100 mL (Good)Sep 8, 2026: 120 per 100 mL (Poor)Sep 22, 2026: 20 per 100 mL (Good)Oct 6, 2026: <10 per 100 mL (Good)Oct 20, 2026: 74 per 100 mL (Poor)
Enterococci per 100 mL, log scale. Lines mark the Moderate (36) and Poor (71) levels.

Recent tests

DateEnterococci per 100 mLRating
Oct 20, 202674Poor Advisory
Oct 6, 2026<10Good
Sep 22, 202620Good
Sep 8, 2026120Poor Advisory
Aug 25, 2026<10Good
Aug 11, 202652Moderate
Jul 28, 202631Good
Jul 14, 2026683Poor Advisory
Jun 30, 2026269Poor Advisory
Jun 16, 202631Good
Jun 2, 2026341Poor Advisory
May 19, 2026<10Good
May 5, 202610Good
Apr 21, 202610Good
Apr 7, 2026161Poor Advisory
Mar 24, 202663Moderate

The long view

The state has 542 tests on record for Islamorada Library Beach over 27 years, starting August 2000. In the last 10 years, 6 tests of 20 (30%) came back Poor, well above the rate for all Florida sampled beaches (6.1%). Bacteria levels usually jump after heavy rain, when stormwater washes to the shore, and drop again within a day or two.

Nearby sampled beaches

About this site

Sampling site ISLAMORADA LIBRARY BEACH (Monroe County, EPA beach ID FL028189), at 24.91806, -80.63750. Results are from the Florida Department of Health's Healthy Beaches Program; years before 2026 come from the state's submissions to EPA's Water Quality Portal.