Gulf Island National Seashore Water Quality

Okaloosa County, Florida

Good

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

Latest test
Nov 2, 2026 (3 days ago)
Enterococci
<10 per 100 mL
Past 12 months
17 of 18 tests Good

Results over time

101001000Jun 22, 2026: 30 per 100 mL (Good)Jun 29, 2026: 50 per 100 mL (Moderate)Jul 7, 2026: 30 per 100 mL (Good)Jul 14, 2026: <10 per 100 mL (Good)Jul 20, 2026: 31 per 100 mL (Good)Jul 27, 2026: <10 per 100 mL (Good)Aug 3, 2026: <10 per 100 mL (Good)Aug 10, 2026: <10 per 100 mL (Good)Aug 17, 2026: <10 per 100 mL (Good)Aug 24, 2026: 20 per 100 mL (Good)Aug 31, 2026: <10 per 100 mL (Good)Sep 8, 2026: <10 per 100 mL (Good)Sep 14, 2026: 10 per 100 mL (Good)Sep 21, 2026: 10 per 100 mL (Good)Sep 28, 2026: 10 per 100 mL (Good)Oct 5, 2026: 31 per 100 mL (Good)Oct 26, 2026: <10 per 100 mL (Good)Nov 2, 2026: <10 per 100 mL (Good)
Enterococci per 100 mL, log scale. Lines mark the Moderate (36) and Poor (71) levels.

Recent tests

DateEnterococci per 100 mLRating
Nov 2, 2026<10Good
Oct 26, 2026<10Good
Oct 19, 2026no resultNo result
Oct 12, 2026no resultNo result
Oct 5, 202631Good
Sep 28, 202610Good
Sep 21, 202610Good
Sep 14, 202610Good
Sep 8, 2026<10Good
Aug 31, 2026<10Good
Aug 24, 202620Good
Aug 17, 2026<10Good
Aug 10, 2026<10Good
Aug 3, 2026<10Good
Jul 27, 2026<10Good
Jul 20, 202631Good

The long view

The state has 721 tests on record for Gulf Island National Seashore over 27 years, starting July 2000. 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 GULF ISLAND NATIONAL SEASHORE (Okaloosa County, EPA beach ID FL705460), at 30.39654, -86.57924. 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.