Main Beach Water Quality

Nassau County, Florida

Good

The latest test found low bacteria levels (35 or fewer per 100 mL).

Latest test
Oct 7, 2026 (29 days ago)
Enterococci
<10 per 100 mL
Past 12 months
17 of 17 tests Good

Results over time

101001000May 11, 2022: <10 per 100 mL (Good)May 26, 2022: <10 per 100 mL (Good)Jun 8, 2022: <10 per 100 mL (Good)Jun 22, 2022: <10 per 100 mL (Good)Jul 6, 2022: <10 per 100 mL (Good)Jul 20, 2022: <10 per 100 mL (Good)Aug 3, 2022: <10 per 100 mL (Good)Aug 17, 2022: <10 per 100 mL (Good)Oct 5, 2022: <10 per 100 mL (Good)Mar 8, 2023: 68 per 100 mL (Moderate)Mar 9, 2023: <10 per 100 mL (Good)Mar 22, 2023: <10 per 100 mL (Good)Apr 5, 2023: <10 per 100 mL (Good)Apr 19, 2023: <10 per 100 mL (Good)May 3, 2023: <10 per 100 mL (Good)May 17, 2023: <10 per 100 mL (Good)May 31, 2023: <10 per 100 mL (Good)Jun 14, 2023: <10 per 100 mL (Good)Jun 28, 2023: <10 per 100 mL (Good)Jul 12, 2023: <10 per 100 mL (Good)Jul 26, 2023: <10 per 100 mL (Good)Aug 9, 2023: <10 per 100 mL (Good)Aug 24, 2023: <10 per 100 mL (Good)Sep 6, 2023: <10 per 100 mL (Good)Sep 20, 2023: <10 per 100 mL (Good)Oct 4, 2023: <10 per 100 mL (Good)Oct 18, 2023: <10 per 100 mL (Good)Mar 6, 2024: <10 per 100 mL (Good)Apr 3, 2024: 20 per 100 mL (Good)Apr 17, 2024: <10 per 100 mL (Good)May 1, 2024: <10 per 100 mL (Good)May 15, 2024: <10 per 100 mL (Good)May 29, 2024: <10 per 100 mL (Good)Jun 12, 2024: <10 per 100 mL (Good)Jun 26, 2024: 12 per 100 mL (Good)Jul 10, 2024: 12 per 100 mL (Good)Jul 24, 2024: 56 per 100 mL (Moderate)Aug 7, 2024: 12 per 100 mL (Good)Aug 21, 2024: <10 per 100 mL (Good)Sep 18, 2024: <10 per 100 mL (Good)Oct 3, 2024: 20 per 100 mL (Good)Mar 5, 2025: 12 per 100 mL (Good)Mar 19, 2025: <10 per 100 mL (Good)Apr 2, 2025: <10 per 100 mL (Good)Apr 16, 2025: 92 per 100 mL (Poor)Apr 30, 2025: <10 per 100 mL (Good)May 14, 2025: <10 per 100 mL (Good)May 29, 2025: <10 per 100 mL (Good)Jun 18, 2025: <10 per 100 mL (Good)Jul 2, 2025: <10 per 100 mL (Good)Jul 16, 2025: <10 per 100 mL (Good)Jul 30, 2025: <10 per 100 mL (Good)Aug 13, 2025: <10 per 100 mL (Good)Aug 27, 2025: <10 per 100 mL (Good)Sep 10, 2025: <10 per 100 mL (Good)Sep 24, 2025: <10 per 100 mL (Good)Oct 8, 2025: <10 per 100 mL (Good)Oct 22, 2025: <10 per 100 mL (Good)Feb 4, 2026: <10 per 100 mL (Good)Feb 18, 2026: <10 per 100 mL (Good)Mar 4, 2026: <10 per 100 mL (Good)Mar 18, 2026: <10 per 100 mL (Good)Apr 1, 2026: <10 per 100 mL (Good)Apr 15, 2026: <10 per 100 mL (Good)Apr 29, 2026: <10 per 100 mL (Good)May 11, 2026: <10 per 100 mL (Good)Jun 3, 2026: <10 per 100 mL (Good)Jun 17, 2026: 12 per 100 mL (Good)Jul 15, 2026: 24 per 100 mL (Good)Jul 29, 2026: <10 per 100 mL (Good)Aug 12, 2026: <10 per 100 mL (Good)Aug 26, 2026: <10 per 100 mL (Good)Sep 9, 2026: 12 per 100 mL (Good)Sep 23, 2026: <10 per 100 mL (Good)Oct 7, 2026: <10 per 100 mL (Good)2023202420252026
Enterococci per 100 mL, log scale. Lines mark the Moderate (36) and Poor (71) levels.

Recent tests

DateEnterococci per 100 mLRating
Oct 7, 2026<10Good
Sep 23, 2026<10Good
Sep 9, 202612Good
Aug 26, 2026<10Good
Aug 12, 2026<10Good
Jul 29, 2026<10Good
Jul 15, 202624Good
Jun 17, 202612Good
Jun 3, 2026<10Good
May 11, 2026<10Good
Apr 29, 2026<10Good
Apr 15, 2026<10Good
Apr 1, 2026<10Good
Mar 18, 2026<10Good
Mar 4, 2026<10Good
Feb 18, 2026<10Good

The long view

The state has 800 tests on record for Main Beach over 27 years, starting July 2000. In the last 10 years, 2 tests of 197 (1%) came back Poor, below 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 MAIN BEACH (Nassau County, EPA beach ID FL926978), at 30.66740, -81.43069. 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.