Crandon Park North - Key Biscayne Water Quality

Miami-Dade County, Florida

Moderate

The latest test found moderate bacteria levels (36 to 70 per 100 mL). Swimming is allowed; people with weak immune systems may want to wait.

Latest test
Oct 28, 2026 (8 days ago)
Enterococci
54 per 100 mL
Past 12 months
17 of 27 tests Good, 7 Poor

Results over time

101001000Nov 8, 2021: 600 per 100 mL (Poor)Nov 9, 2021: 500 per 100 mL (Poor)Nov 10, 2021: 64 per 100 mL (Moderate)Nov 15, 2021: 30 per 100 mL (Good)Nov 22, 2021: <10 per 100 mL (Good)Nov 29, 2021: <10 per 100 mL (Good)Dec 6, 2021: 24 per 100 mL (Good)Dec 13, 2021: <10 per 100 mL (Good)Dec 20, 2021: 10 per 100 mL (Good)Dec 27, 2021: <10 per 100 mL (Good)Jan 3, 2022: 10 per 100 mL (Good)Jan 10, 2022: 106 per 100 mL (Poor)Jan 11, 2022: 14 per 100 mL (Good)Jan 31, 2022: 90 per 100 mL (Poor)Feb 1, 2022: 20 per 100 mL (Good)Feb 7, 2022: 10 per 100 mL (Good)Feb 14, 2022: 10 per 100 mL (Good)Feb 21, 2022: <10 per 100 mL (Good)Feb 28, 2022: <10 per 100 mL (Good)Mar 8, 2022: 54 per 100 mL (Moderate)Mar 14, 2022: <10 per 100 mL (Good)Mar 21, 2022: 14 per 100 mL (Good)Mar 28, 2022: <10 per 100 mL (Good)Apr 4, 2022: 64 per 100 mL (Moderate)Apr 11, 2022: <10 per 100 mL (Good)Apr 18, 2022: 66 per 100 mL (Moderate)Apr 25, 2022: <10 per 100 mL (Good)May 2, 2022: 10 per 100 mL (Good)May 9, 2022: <10 per 100 mL (Good)May 16, 2022: <10 per 100 mL (Good)May 23, 2022: <10 per 100 mL (Good)May 31, 2022: 30 per 100 mL (Good)Jun 5, 2022: 30 per 100 mL (Good)Jun 6, 2022: 10 per 100 mL (Good)Jun 13, 2022: <10 per 100 mL (Good)Jun 20, 2022: <10 per 100 mL (Good)Jun 27, 2022: <10 per 100 mL (Good)Jul 5, 2022: <10 per 100 mL (Good)Jul 11, 2022: <10 per 100 mL (Good)Jul 18, 2022: <10 per 100 mL (Good)Jul 25, 2022: <10 per 100 mL (Good)Aug 1, 2022: 30 per 100 mL (Good)Aug 8, 2022: <10 per 100 mL (Good)Aug 15, 2022: 300 per 100 mL (Poor)Aug 16, 2022: 80 per 100 mL (Poor)Aug 22, 2022: 14 per 100 mL (Good)Aug 29, 2022: 136 per 100 mL (Poor)Aug 30, 2022: 10 per 100 mL (Good)Sep 6, 2022: <10 per 100 mL (Good)Sep 12, 2022: 26 per 100 mL (Good)Sep 19, 2022: 10 per 100 mL (Good)Sep 26, 2022: 48 per 100 mL (Moderate)Oct 3, 2022: <10 per 100 mL (Good)Oct 10, 2022: 22 per 100 mL (Good)Oct 17, 2022: <10 per 100 mL (Good)Oct 24, 2022: <10 per 100 mL (Good)Oct 31, 2022: 10 per 100 mL (Good)Nov 7, 2022: <10 per 100 mL (Good)Nov 14, 2022: <10 per 100 mL (Good)Nov 21, 2022: 24 per 100 mL (Good)Nov 22, 2022: 14 per 100 mL (Good)Nov 28, 2022: <10 per 100 mL (Good)Dec 5, 2022: <10 per 100 mL (Good)Dec 12, 2022: <10 per 100 mL (Good)Dec 19, 2022: 12 per 100 mL (Good)Dec 27, 2022: <10 per 100 mL (Good)Jan 3, 2023: <10 per 100 mL (Good)Jan 9, 2023: <10 per 100 mL (Good)Jan 17, 2023: 10 per 100 mL (Good)Jan 23, 2023: <10 per 100 mL (Good)Jan 30, 2023: <10 per 100 mL (Good)Feb 6, 2023: <10 per 100 mL (Good)Feb 13, 2023: <10 per 100 mL (Good)Feb 20, 2023: <10 per 100 mL (Good)Feb 27, 2023: <10 per 100 mL (Good)Mar 6, 2023: <10 per 100 mL (Good)Mar 13, 2023: <10 per 100 mL (Good)Mar 20, 2023: 300 per 100 mL (Poor)Mar 21, 2023: <10 per 100 mL (Good)Mar 27, 2023: 44 per 100 mL (Moderate)Apr 3, 2023: 300 per 100 mL (Poor)Apr 4, 2023: 500 per 100 mL (Poor)Apr 10, 2023: 300 per 100 mL (Poor)Apr 12, 2023: 14 per 100 mL (Good)Apr 17, 2023: <10 per 100 mL (Good)Apr 24, 2023: 10 per 100 mL (Good)May 1, 2023: 10 per 100 mL (Good)May 8, 2023: 60 per 100 mL (Moderate)May 15, 2023: 20 per 100 mL (Good)May 22, 2023: 20 per 100 mL (Good)May 30, 2023: 10 per 100 mL (Good)Jun 5, 2023: <10 per 100 mL (Good)Jun 12, 2023: <10 per 100 mL (Good)Jun 19, 2023: <10 per 100 mL (Good)Jun 26, 2023: 10 per 100 mL (Good)Jul 5, 2023: 10 per 100 mL (Good)Jul 10, 2023: 10 per 100 mL (Good)Jul 17, 2023: 10 per 100 mL (Good)Jul 24, 2023: 10 per 100 mL (Good)Jul 31, 2023: 63 per 100 mL (Moderate)Aug 7, 2023: 34 per 100 mL (Good)Aug 14, 2023: 16 per 100 mL (Good)Aug 21, 2023: 300 per 100 mL (Poor)Aug 22, 2023: 600 per 100 mL (Poor)Aug 28, 2023: <10 per 100 mL (Good)Sep 5, 2023: 300 per 100 mL (Poor)Sep 6, 2023: <10 per 100 mL (Good)Sep 11, 2023: 300 per 100 mL (Poor)Sep 13, 2023: 66 per 100 mL (Moderate)Sep 18, 2023: <10 per 100 mL (Good)Sep 19, 2023: 41 per 100 mL (Moderate)Sep 20, 2023: 281 per 100 mL (Poor)Sep 25, 2023: 48 per 100 mL (Moderate)Oct 2, 2023: 300 per 100 mL (Poor)Oct 3, 2023: 200 per 100 mL (Poor)Oct 9, 2023: 18 per 100 mL (Good)Oct 16, 2023: 300 per 100 mL (Poor)Oct 17, 2023: <10 per 100 mL (Good)Oct 18, 2023: 44 per 100 mL (Moderate)Oct 19, 2023: 38 per 100 mL (Moderate)Oct 23, 2023: <10 per 100 mL (Good)Oct 30, 2023: <10 per 100 mL (Good)Nov 6, 2023: <10 per 100 mL (Good)Nov 13, 2023: <10 per 100 mL (Good)Nov 20, 2023: <10 per 100 mL (Good)Nov 27, 2023: <10 per 100 mL (Good)Dec 4, 2023: <10 per 100 mL (Good)Dec 11, 2023: <10 per 100 mL (Good)Dec 18, 2023: 80 per 100 mL (Poor)Dec 19, 2023: 74 per 100 mL (Poor)Dec 21, 2023: 22 per 100 mL (Good)Dec 27, 2023: <10 per 100 mL (Good)Jan 3, 2024: 10 per 100 mL (Good)Jan 8, 2024: <10 per 100 mL (Good)Jan 16, 2024: 28 per 100 mL (Good)Jan 22, 2024: <10 per 100 mL (Good)Jan 29, 2024: 14 per 100 mL (Good)Jan 30, 2024: <10 per 100 mL (Good)Feb 5, 2024: <10 per 100 mL (Good)Feb 12, 2024: 32 per 100 mL (Good)Feb 19, 2024: <10 per 100 mL (Good)Feb 27, 2024: <10 per 100 mL (Good)Mar 4, 2024: <10 per 100 mL (Good)Mar 11, 2024: <10 per 100 mL (Good)Mar 18, 2024: <10 per 100 mL (Good)Mar 25, 2024: 300 per 100 mL (Poor)Mar 26, 2024: 54 per 100 mL (Moderate)Apr 1, 2024: 10 per 100 mL (Good)Apr 8, 2024: 56 per 100 mL (Moderate)Apr 15, 2024: <10 per 100 mL (Good)Apr 22, 2024: <10 per 100 mL (Good)Apr 29, 2024: 16 per 100 mL (Good)May 6, 2024: <10 per 100 mL (Good)May 13, 2024: 12 per 100 mL (Good)May 20, 2024: <10 per 100 mL (Good)May 28, 2024: <10 per 100 mL (Good)Jun 3, 2024: <10 per 100 mL (Good)Jun 10, 2024: <10 per 100 mL (Good)Jun 17, 2024: <10 per 100 mL (Good)Jun 24, 2024: 66 per 100 mL (Moderate)Jul 1, 2024: 677 per 100 mL (Poor)Jul 2, 2024: 10 per 100 mL (Good)Jul 9, 2024: 933 per 100 mL (Poor)Jul 11, 2024: 158 per 100 mL (Poor)Jul 15, 2024: 287 per 100 mL (Poor)Jul 17, 2024: 52 per 100 mL (Moderate)Aug 5, 2024: <10 per 100 mL (Good)Aug 12, 2024: <10 per 100 mL (Good)Aug 19, 2024: 26 per 100 mL (Good)Aug 26, 2024: 92 per 100 mL (Poor)Aug 27, 2024: 36 per 100 mL (Moderate)Sep 3, 2024: 116 per 100 mL (Poor)Sep 4, 2024: 86 per 100 mL (Poor)Sep 9, 2024: 24 per 100 mL (Good)Sep 16, 2024: 34 per 100 mL (Good)Sep 23, 2024: <10 per 100 mL (Good)Sep 30, 2024: 66 per 100 mL (Moderate)Oct 7, 2024: 48 per 100 mL (Moderate)Oct 11, 2024: 124 per 100 mL (Poor)Oct 14, 2024: <10 per 100 mL (Good)Oct 21, 2024: 12 per 100 mL (Good)Oct 28, 2024: <10 per 100 mL (Good)Nov 4, 2024: 12 per 100 mL (Good)Nov 12, 2024: <10 per 100 mL (Good)Nov 19, 2024: 44 per 100 mL (Moderate)Nov 25, 2024: <10 per 100 mL (Good)Dec 3, 2024: <10 per 100 mL (Good)Dec 9, 2024: <10 per 100 mL (Good)Dec 16, 2024: <10 per 100 mL (Good)Jan 2, 2025: 10 per 100 mL (Good)Jan 6, 2025: 24 per 100 mL (Good)Jan 13, 2025: 24 per 100 mL (Good)Jan 21, 2025: <10 per 100 mL (Good)Jan 27, 2025: <10 per 100 mL (Good)Feb 3, 2025: 164 per 100 mL (Poor)Feb 4, 2025: <10 per 100 mL (Good)Feb 10, 2025: <10 per 100 mL (Good)Feb 17, 2025: <10 per 100 mL (Good)Feb 24, 2025: 32 per 100 mL (Good)Mar 3, 2025: 12 per 100 mL (Good)Mar 17, 2025: <10 per 100 mL (Good)Mar 24, 2025: 58 per 100 mL (Moderate)Apr 7, 2025: <10 per 100 mL (Good)Apr 14, 2025: <10 per 100 mL (Good)Apr 21, 2025: <10 per 100 mL (Good)Apr 28, 2025: <10 per 100 mL (Good)May 5, 2025: <10 per 100 mL (Good)May 13, 2025: 14 per 100 mL (Good)May 19, 2025: 14 per 100 mL (Good)May 27, 2025: <10 per 100 mL (Good)Jun 2, 2025: <10 per 100 mL (Good)Jun 9, 2025: <10 per 100 mL (Good)Jun 16, 2025: <10 per 100 mL (Good)Jun 23, 2025: 20 per 100 mL (Good)Jun 30, 2025: 20 per 100 mL (Good)Jul 7, 2025: <10 per 100 mL (Good)Jul 14, 2025: <10 per 100 mL (Good)Jul 21, 2025: <10 per 100 mL (Good)Jul 28, 2025: 10 per 100 mL (Good)Aug 4, 2025: <10 per 100 mL (Good)Aug 11, 2025: 300 per 100 mL (Poor)Aug 12, 2025: 300 per 100 mL (Poor)Aug 18, 2025: <10 per 100 mL (Good)Aug 25, 2025: <10 per 100 mL (Good)Sep 2, 2025: <10 per 100 mL (Good)Sep 8, 2025: 22 per 100 mL (Good)Sep 15, 2025: 62 per 100 mL (Moderate)Sep 22, 2025: 300 per 100 mL (Poor)Sep 23, 2025: 1160 per 100 mL (Poor)Sep 29, 2025: <10 per 100 mL (Good)Oct 6, 2025: 82 per 100 mL (Poor)Oct 7, 2025: <10 per 100 mL (Good)Oct 8, 2025: <10 per 100 mL (Good)Oct 13, 2025: 36 per 100 mL (Moderate)Oct 20, 2025: <10 per 100 mL (Good)Oct 27, 2025: 56 per 100 mL (Moderate)Nov 3, 2025: <10 per 100 mL (Good)Nov 12, 2025: <10 per 100 mL (Good)Nov 17, 2025: <10 per 100 mL (Good)Nov 24, 2025: <10 per 100 mL (Good)Dec 1, 2025: <10 per 100 mL (Good)Dec 8, 2025: <10 per 100 mL (Good)Dec 16, 2025: <10 per 100 mL (Good)Dec 23, 2025: 42 per 100 mL (Moderate)Jul 22, 2026: <10 per 100 mL (Good)Jul 28, 2026: <10 per 100 mL (Good)Aug 11, 2026: <10 per 100 mL (Good)Aug 18, 2026: <10 per 100 mL (Good)Aug 25, 2026: 88 per 100 mL (Poor)Aug 28, 2026: 104 per 100 mL (Poor)Aug 31, 2026: 300 per 100 mL (Poor)Sep 1, 2026: <10 per 100 mL (Good)Sep 9, 2026: 300 per 100 mL (Poor)Sep 10, 2026: 24 per 100 mL (Good)Sep 15, 2026: 130 per 100 mL (Poor)Sep 16, 2026: <10 per 100 mL (Good)Sep 23, 2026: 142 per 100 mL (Poor)Sep 24, 2026: <10 per 100 mL (Good)Sep 29, 2026: <10 per 100 mL (Good)Oct 5, 2026: <10 per 100 mL (Good)Oct 13, 2026: 36 per 100 mL (Moderate)Oct 20, 2026: 22 per 100 mL (Good)Oct 27, 2026: 300 per 100 mL (Poor)Oct 28, 2026: 54 per 100 mL (Moderate)20222023202420252026
Enterococci per 100 mL, log scale. Lines mark the Moderate (36) and Poor (71) levels.

Recent tests

DateEnterococci per 100 mLRating
Oct 28, 202654Moderate
Oct 27, 2026300Poor
Oct 20, 202622Good
Oct 13, 202636Moderate
Oct 5, 2026<10Good
Sep 29, 2026<10Good
Sep 24, 2026<10Good
Sep 23, 2026142Poor
Sep 16, 2026<10Good
Sep 15, 2026130Poor
Sep 10, 202624Good
Sep 9, 2026300Poor
Sep 1, 2026<10Good
Aug 31, 2026300Poor
Aug 28, 2026104Poor
Aug 25, 202688Poor

The long view

The state has 1,406 tests on record for Crandon Park North - Key Biscayne over 27 years, starting August 2000. In the last 10 years, 88 tests of 555 (16%) 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 CRANDON PARK NORTH - KEY BISCAYNE (Miami-Dade County, EPA beach ID FL193553), at 25.70366, -80.15324. 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.