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Lake Tarpon algae history from satellite

We read Lake Tarpon from 388 cloud-free satellite scenes between Feb 14, 2016 – Sep 19, 2026. Here is what the surface water showed.

Clear scenes
388
Typical (median), index
50
Highest reading
161 · Jun 11, 2025
Latest scene
103 · Sep 19, 2026

Algae signal (red-edge index) over time

0501001502002017201820192020202120222023202420252026Feb 14, 2016: 23 index (low)Apr 14, 2016: 32 index (low)May 14, 2016: 45 index (low)Jun 23, 2016: 67 index (low)Jul 13, 2016: 83 index (high)Aug 22, 2016: 37 index (low)Sep 11, 2016: 35 index (low)Oct 1, 2016: 37 index (low)Oct 21, 2016: 36 index (low)Nov 10, 2016: 28 index (low)Nov 20, 2016: 29 index (low)Feb 8, 2017: 27 index (low)Mar 10, 2017: 21 index (low)Mar 30, 2017: 34 index (low)Apr 19, 2017: 56 index (low)May 29, 2017: 106 index (low)Jun 18, 2017: 100 index (high)Jul 3, 2017: 115 index (high)Jul 28, 2017: 75 index (high)Aug 17, 2017: 64 index (high)Oct 16, 2017: 39 index (low)Nov 20, 2017: 23 index (low)Nov 25, 2017: 22 index (low)Nov 30, 2017: 21 index (low)Dec 10, 2017: 21 index (low)Dec 30, 2017: 5.5 index (low)Jan 4, 2018: 16 index (low)Jan 9, 2018: 3.5 index (low)Jan 24, 2018: 13 index (low)Feb 18, 2018: 19 index (low)Feb 23, 2018: 18 index (low)Feb 28, 2018: 25 index (low)Mar 5, 2018: 19 index (low)Mar 15, 2018: 16 index (low)Mar 25, 2018: 22 index (low)Apr 4, 2018: 23 index (low)Apr 9, 2018: 44 index (low)Apr 14, 2018: 36 index (low)Apr 19, 2018: 28 index (low)Apr 24, 2018: 29 index (low)Apr 29, 2018: 28 index (low)May 4, 2018: 27 index (low)May 9, 2018: 32 index (low)May 19, 2018: 42 index (low)May 24, 2018: 49 index (low)Jun 8, 2018: 32 index (low)Jun 23, 2018: 85 index (low)Jun 28, 2018: 84 index (low)Jul 3, 2018: 71 index (high)Aug 2, 2018: 72 index (low)Aug 7, 2018: 52 index (low)Aug 12, 2018: 57 index (low)Aug 22, 2018: 64 index (high)Aug 27, 2018: 58 index (high)Sep 1, 2018: 57 index (low)Sep 6, 2018: 55 index (high)Sep 16, 2018: 50 index (low)Sep 21, 2018: 47 index (low)Sep 26, 2018: 50 index (low)Oct 1, 2018: 50 index (low)Oct 6, 2018: 43 index (low)Oct 16, 2018: 43 index (low)Oct 21, 2018: 43 index (low)Oct 31, 2018: 38 index (low)Nov 10, 2018: 38 index (low)Nov 25, 2018: 22 index (low)Dec 5, 2018: 41 index (low)Dec 25, 2018: 30 index (low)Jan 24, 2019: 31 index (low)Jan 29, 2019: 21 index (low)Feb 8, 2019: 24 index (low)Feb 23, 2019: 31 index (low)Feb 28, 2019: 27 index (low)Mar 10, 2019: 29 index (low)Mar 15, 2019: 30 index (low)Mar 30, 2019: 27 index (low)Apr 4, 2019: 25 index (low)Apr 9, 2019: 44 index (low)Apr 24, 2019: 26 index (low)May 4, 2019: 30 index (low)May 19, 2019: 45 index (low)May 24, 2019: 50 index (low)May 29, 2019: 48 index (low)Jun 18, 2019: 51 index (low)Jun 23, 2019: 51 index (low)Jun 28, 2019: 56 index (low)Jul 3, 2019: 69 index (low)Jul 23, 2019: 60 index (low)Jul 28, 2019: 44 index (low)Aug 22, 2019: 38 index (low)Sep 1, 2019: 36 index (low)Sep 11, 2019: 31 index (low)Sep 16, 2019: 36 index (low)Sep 21, 2019: 36 index (low)Sep 26, 2019: 31 index (low)Oct 1, 2019: 34 index (low)Oct 6, 2019: 33 index (low)Oct 11, 2019: 31 index (low)Oct 16, 2019: 30 index (low)Nov 10, 2019: 30 index (low)Nov 20, 2019: 26 index (low)Nov 30, 2019: 25 index (low)Dec 15, 2019: 21 index (low)Dec 20, 2019: 25 index (low)Dec 25, 2019: 31 index (low)Feb 3, 2020: 19 index (low)Feb 8, 2020: 30 index (low)Feb 23, 2020: 29 index (low)Feb 28, 2020: 25 index (low)Mar 4, 2020: 33 index (low)Mar 9, 2020: 34 index (low)Mar 14, 2020: 18 index (low)Mar 19, 2020: 26 index (low)Mar 29, 2020: 25 index (low)Apr 3, 2020: 19 index (low)Apr 8, 2020: 48 index (low)Apr 13, 2020: 65 index (low)Apr 23, 2020: 69 index (low)Apr 28, 2020: 48 index (low)May 3, 2020: 45 index (low)May 8, 2020: 50 index (low)May 13, 2020: 65 index (low)May 28, 2020: 65 index (low)Jun 17, 2020: 65 index (low)Jul 12, 2020: 108 index (low)Jul 17, 2020: 97 index (high)Jul 27, 2020: 81 index (high)Aug 1, 2020: 60 index (high)Aug 11, 2020: 85 index (high)Aug 16, 2020: 93 index (low)Aug 26, 2020: 87 index (high)Sep 5, 2020: 55 index (low)Sep 25, 2020: 50 index (low)Oct 15, 2020: 40 index (low)Oct 25, 2020: 45 index (low)Oct 30, 2020: 41 index (low)Nov 4, 2020: 45 index (low)Nov 14, 2020: 53 index (high)Nov 19, 2020: 48 index (low)Nov 24, 2020: 42 index (low)Dec 9, 2020: 32 index (low)Dec 14, 2020: 23 index (low)Dec 19, 2020: 33 index (low)Dec 29, 2020: 25 index (low)Jan 18, 2021: 29 index (low)Jan 28, 2021: 43 index (low)Feb 22, 2021: 40 index (low)Feb 27, 2021: 29 index (low)Mar 4, 2021: 38 index (low)Mar 9, 2021: 36 index (low)Mar 14, 2021: 35 index (low)Mar 24, 2021: 33 index (low)Apr 3, 2021: 48 index (low)Apr 8, 2021: 29 index (low)Apr 13, 2021: 36 index (low)Apr 28, 2021: 43 index (low)May 3, 2021: 62 index (low)May 8, 2021: 52 index (high)May 18, 2021: 79 index (low)May 23, 2021: 61 index (low)May 28, 2021: 54 index (low)Jun 12, 2021: 97 index (low)Jun 22, 2021: 105 index (low)Jun 27, 2021: 117 index (low)Jul 12, 2021: 78 index (high)Aug 6, 2021: 45 index (low)Aug 11, 2021: 61 index (high)Aug 21, 2021: 55 index (high)Sep 10, 2021: 57 index (high)Sep 25, 2021: 34 index (low)Sep 30, 2021: 21 index (low)Oct 10, 2021: 37 index (low)Nov 9, 2021: 38 index (low)Nov 14, 2021: 33 index (low)Nov 19, 2021: 31 index (low)Nov 24, 2021: 38 index (low)Nov 29, 2021: 29 index (low)Dec 4, 2021: 24 index (low)Dec 9, 2021: 33 index (low)Dec 24, 2021: 24 index (low)Dec 29, 2021: 28 index (low)Jan 3, 2022: 36 index (low)Jan 8, 2022: 33 index (low)Jan 18, 2022: 33 index (low)Feb 2, 2022: 35 index (low)Feb 12, 2022: 28 index (low)Feb 17, 2022: 42 index (low)Feb 22, 2022: 29 index (low)Feb 27, 2022: 33 index (low)Mar 4, 2022: 32 index (low)Mar 14, 2022: 49 index (low)Mar 19, 2022: 56 index (low)Mar 29, 2022: 44 index (low)Apr 3, 2022: 52 index (high)Apr 8, 2022: 55 index (low)Apr 28, 2022: 75 index (high)May 3, 2022: 57 index (high)May 8, 2022: 57 index (low)May 18, 2022: 76 index (low)May 23, 2022: 71 index (low)May 28, 2022: 68 index (low)Jun 7, 2022: 72 index (low)Jun 12, 2022: 90 index (low)Jul 7, 2022: 74 index (high)Jul 12, 2022: 78 index (high)Jul 22, 2022: 68 index (high)Jul 27, 2022: 82 index (low)Aug 1, 2022: 64 index (high)Aug 6, 2022: 84 index (high)Aug 16, 2022: 78 index (high)Sep 5, 2022: 69 index (high)Sep 20, 2022: 67 index (high)Sep 30, 2022: 71 index (high)Oct 5, 2022: 52 index (high)Oct 20, 2022: 49 index (low)Oct 25, 2022: 40 index (low)Oct 30, 2022: 36 index (low)Nov 4, 2022: 36 index (low)Nov 14, 2022: 51 index (high)Nov 19, 2022: 46 index (low)Nov 29, 2022: 37 index (low)Dec 4, 2022: 36 index (low)Dec 9, 2022: 40 index (low)Dec 19, 2022: 33 index (low)Dec 29, 2022: 28 index (low)Jan 8, 2023: 32 index (low)Jan 13, 2023: 50 index (high)Jan 18, 2023: 34 index (low)Feb 7, 2023: 38 index (low)Feb 22, 2023: 34 index (low)Feb 27, 2023: 41 index (low)Mar 4, 2023: 63 index (high)Mar 9, 2023: 43 index (low)Mar 19, 2023: 46 index (low)Mar 24, 2023: 36 index (low)Mar 29, 2023: 35 index (low)Apr 8, 2023: 55 index (low)Apr 18, 2023: 50 index (low)Apr 23, 2023: 60 index (low)Apr 28, 2023: 80 index (high)May 3, 2023: 56 index (low)May 8, 2023: 60 index (high)May 13, 2023: 87 index (high)May 18, 2023: 81 index (low)May 28, 2023: 74 index (low)Jun 2, 2023: 103 index (low)Jun 12, 2023: 81 index (low)Jun 17, 2023: 97 index (low)Jun 27, 2023: 82 index (low)Jul 17, 2023: 91 index (low)Jul 22, 2023: 95 index (low)Aug 11, 2023: 79 index (high)Aug 21, 2023: 82 index (high)Aug 26, 2023: 74 index (high)Aug 31, 2023: 84 index (high)Sep 5, 2023: 65 index (high)Sep 10, 2023: 72 index (high)Sep 15, 2023: 68 index (low)Sep 25, 2023: 53 index (low)Oct 5, 2023: 73 index (high)Oct 20, 2023: 61 index (high)Oct 25, 2023: 63 index (high)Nov 4, 2023: 65 index (high)Nov 9, 2023: 63 index (high)Nov 19, 2023: 72 index (high)Nov 29, 2023: 68 index (high)Dec 9, 2023: 72 index (high)Dec 19, 2023: 76 index (high)Dec 29, 2023: 68 index (low)Jan 28, 2024: 73 index (high)Feb 2, 2024: 56 index (high)Feb 7, 2024: 65 index (high)Feb 22, 2024: 54 index (high)Feb 27, 2024: 63 index (high)Mar 3, 2024: 66 index (high)Mar 13, 2024: 71 index (high)Mar 23, 2024: 87 index (high)Mar 28, 2024: 89 index (high)Apr 12, 2024: 78 index (high)Apr 17, 2024: 67 index (high)Apr 22, 2024: 83 index (high)May 2, 2024: 81 index (high)May 7, 2024: 109 index (high)May 22, 2024: 102 index (high)May 27, 2024: 90 index (low)Jun 6, 2024: 96 index (low)Jun 16, 2024: 102 index (high)Jun 26, 2024: 135 index (high)Jul 6, 2024: 142 index (high)Jul 16, 2024: 152 index (high)Jul 21, 2024: 136 index (high)Jul 31, 2024: 107 index (high)Aug 10, 2024: 142 index (high)Aug 15, 2024: 123 index (high)Aug 25, 2024: 106 index (high)Aug 30, 2024: 118 index (high)Sep 24, 2024: 60 index (high)Oct 14, 2024: 56 index (high)Oct 24, 2024: 45 index (low)Oct 29, 2024: 41 index (low)Nov 13, 2024: 33 index (low)Nov 18, 2024: 28 index (low)Nov 23, 2024: 23 index (low)Nov 28, 2024: 24 index (low)Dec 3, 2024: 14 index (low)Dec 13, 2024: 13 index (low)Dec 18, 2024: 26 index (low)Dec 23, 2024: 23 index (low)Jan 2, 2025: 16 index (low)Jan 12, 2025: 0 index (low)Jan 17, 2025: 17 index (low)Jan 27, 2025: 9.5 index (low)Feb 6, 2025: 12 index (low)Feb 26, 2025: 22 index (low)Mar 3, 2025: 27 index (low)Mar 8, 2025: 20 index (low)Mar 13, 2025: 30 index (low)Mar 18, 2025: 19 index (low)Mar 28, 2025: 27 index (low)Apr 2, 2025: 31 index (low)Apr 7, 2025: 36 index (low)Apr 12, 2025: 29 index (low)Apr 17, 2025: 12 index (low)Apr 27, 2025: 16 index (low)May 2, 2025: 29 index (low)May 9, 2025: 54 index (low)May 17, 2025: 22 index (low)May 27, 2025: 72 index (low)May 29, 2025: 73 index (low)Jun 6, 2025: 144 index (high)Jun 11, 2025: 161 index (high)Jun 21, 2025: 155 index (high)Jun 26, 2025: 92 index (high)Jul 11, 2025: 76 index (high)Jul 26, 2025: 60 index (high)Jul 31, 2025: 82 index (high)Aug 15, 2025: 72 index (high)Aug 30, 2025: 93 index (high)Sep 6, 2025: 80 index (high)Sep 14, 2025: 60 index (high)Sep 19, 2025: 74 index (high)Sep 24, 2025: 56 index (high)Oct 14, 2025: 59 index (high)Oct 16, 2025: 68 index (high)Oct 24, 2025: 62 index (high)Oct 29, 2025: 67 index (high)Nov 3, 2025: 60 index (high)Nov 5, 2025: 61 index (high)Nov 13, 2025: 59 index (high)Nov 18, 2025: 61 index (high)Nov 23, 2025: 42 index (low)Nov 25, 2025: 54 index (high)Nov 28, 2025: 62 index (high)Dec 15, 2025: 67 index (high)Dec 23, 2025: 56 index (high)Jan 2, 2026: 40 index (low)Jan 4, 2026: 60 index (high)Jan 7, 2026: 51 index (low)Jan 17, 2026: 63 index (high)Jan 22, 2026: 54 index (high)Jan 27, 2026: 64 index (high)Feb 6, 2026: 66 index (high)Feb 21, 2026: 59 index (high)Mar 3, 2026: 60 index (high)Mar 8, 2026: 76 index (high)Mar 13, 2026: 73 index (high)Mar 15, 2026: 92 index (high)Mar 18, 2026: 87 index (high)Mar 28, 2026: 89 index (high)Apr 4, 2026: 84 index (high)Apr 12, 2026: 73 index (high)Apr 17, 2026: 86 index (high)Apr 24, 2026: 87 index (high)Apr 27, 2026: 118 index (high)May 7, 2026: 87 index (high)May 14, 2026: 107 index (high)May 17, 2026: 118 index (high)May 22, 2026: 116 index (high)Jun 6, 2026: 126 index (high)Jun 11, 2026: 118 index (high)Jun 16, 2026: 135 index (high)Jun 21, 2026: 132 index (high)Jun 23, 2026: 135 index (high)Jul 11, 2026: 147 index (high)Aug 15, 2026: 114 index (high)Sep 4, 2026: 136 index (high)Sep 9, 2026: 96 index (high)Sep 19, 2026: 103 index (high)
Algae signal (red-edge index), index. One dot per cloud-free scene; dates are local to the lake.

When it peaks

MonthClear scenesMedian, indexScenes rated high
Jan243325%
Feb302920%
Mar413527%
Apr404828%
May426226%
Jun309740%
Jul258272%
Aug297476%
Sep315648%
Oct304330%
Nov383832%
Dec282914%

By year (median / highest): 2016: 36 / 83 (11 scenes) · 2017: 34 / 115 (15 scenes) · 2018: 40 / 85 (42 scenes) · 2019: 31 / 69 (37 scenes) · 2020: 45 / 108 (39 scenes) · 2021: 38 / 117 (37 scenes) · 2022: 51 / 90 (44 scenes) · 2023: 66 / 103 (44 scenes) · 2024: 73 / 152 (39 scenes) · 2025: 59 / 161 (47 scenes) · 2026: 87 / 147 (33 scenes).

What a satellite can and can’t tell you

Satellites see only the surface layer, only on cloud-free days, and only away from the shoreline. They estimate algae; they do not measure toxins, and they can’t see what the lake bottom is doing. A clear reading is not a safety clearance.

For current conditions and health advisories, check the Florida DEP algal bloom page and the Florida Department of Health. If a person or pet may have been exposed to a bloom, call a doctor, a veterinarian, or Poison Help at 1-800-222-1222.

Source: Sentinel-2 MSI (ESA Copernicus), Red-edge cyanobacteria index (CI-cyano); a scene counts as a bloom when the index is above 50 and stays high relative to turbidity (bloom rule v1 (2026-10)). Snapshot exported Oct 9, 2026.

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