Cyanobacteria advisory (harmful blue-green algae) reported, Dec 9, 2025

Advisory active · Florida Department of Environmental Protection (Algal Bloom Sampling)

Source: Florida Department of Environmental Protection (Algal Bloom Sampling) via Florida DEP Algal Bloom Sampling, blooms and toxins by site, record 7c7b6751-9b94-4374-895e-eb7026bf1e2a, updated by the source Oct 26, 2026, 9:30 AM EDT, retrieved 2026-11-05 01:05 UTC · Read the original notice

Current status from this report

Discharge or advisory reported on Lake Thonotosassa: Official advisory in effect. Current rule period ends Nov 9, 2026, 8:30 AM EST. This is not a water-quality test.

Why this status: Discharge or advisory reported: official advisory.

Why we use this rule: An official advisory is listed. We show it while the authority keeps it in place; an old or missing update does not mean the advisory was lifted.

How long each status lasts, and why

A report is not a test of the water. See how we assign statuses.

Read the original notice · Report an error

1. Where the advisory applies

Issued by: Florida Department of Environmental Protection (Algal Bloom Sampling). Place named: “Lake Thonotosassa - South Shore”. Location: 28.05085, -82.28206; location source: given in the source record, accurate to about 10 metres.

2. Waters named in the notice

The notice names: “Lake Thonotosassa”. DirtyWaterWatch links this report to Lake Thonotosassa, FL. Match basis: the water named in the report.

Map sources: water outlines and launches from OpenBoatLaunch and OpenStreetMap contributors (Open Database License); wastewater outlets from EPA and state records; downstream estimates by DirtyWaterWatch using U.S. Geological Survey maps and flow data. Base map: OpenFreeMap and OpenMapTiles.

Open on the main map

When it happened and when it was reported

Event and notice times use Eastern Time (EST or EDT). Retrieval times use Coordinated Universal Time (UTC).

Started: Dec 9, 2025, 11:15 AM EST
Ended: not reported
Detail provided by the source: Times known to the minute
Reported to the source: not given
Published: not given
Source last updated: Oct 26, 2026, 9:30 AM EDT
Last retrieved by DirtyWaterWatch: 2026-11-05 01:05 UTC

What was reported

Type: Cyanobacteria (harmful blue-green algae) can make water unfit for contact; the issuing authority decides when its advisory ends.
Status in the record: Advisory active
Material: “algal bloom (Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya limnetica; Co-dominant taxa were: Raphidiopsis raciborskii and Planktolyngbya limnetica; Co-dominant taxa were: Dolichospermum circinale and Planktolyngbya contorta; mixed algae; no dominant species in sample; Co-dominant taxa were: Planktolyngbya limnetica and Planktolyngbya contorta; Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya spp.; Dominant taxon: Microcystis aeruginosa; Dominant taxon: Planktolyngbya contorta)”

Advice from Florida Department of Environmental Protection (Algal Bloom Sampling)

This report includes no advice. Check current local health notices.

Advice period: This report does not state a period. See the rule DirtyWaterWatch applies and its source.
Basis: not stated

Status history from this report

Discharge or advisory reported Lake Thonotosassa: Official advisory in effect, Dec 9, 2025, 11:15 AM EST to Nov 9, 2026, 8:30 AM EST (the end is scheduled: a new report can change it)

Source: DirtyWaterWatch calculations using this report and the published status rules. Updated 2026-11-05 01:25 UTC.

Source and versions

Source: Florida DEP Algal Bloom Sampling, blooms and toxins by site
Source record number: 7c7b6751-9b94-4374-895e-eb7026bf1e2a
Original notice: Read the original notice
Earlier version: None: this is the first record
Later versions: None

Record details

Record details
Record identifier	fl-dep-habs:7c7b6751-9b94-4374-895e-eb7026bf1e2a
Source identifier	fl-dep-habs
Source record number	7c7b6751-9b94-4374-895e-eb7026bf1e2a
Earlier version	Not provided
Type	Cyanobacteria advisory (harmful blue-green algae)
Status in the report	Advisory active
Sewer operator identifier	Not provided
Sewer operator	Not provided
Federal wastewater discharge permit (NPDES)	Not provided
Outlet number	Not provided
Outlet name	Lake Thonotosassa - South Shore
Water named in the report	Lake Thonotosassa
Linked waters	lake-thonotosassa-fl
How this report was linked to the water	the water named in the report
Latitude	28.051
Longitude	-82.282
Location source	given in the source record
Location accuracy, in metres	10
Started	Dec 9, 2025, 11:15 AM EST (2025-12-09T11:15:00-05:00)
Ended	Not provided
Detail provided by the source	to the minute
Reported to the source	Not provided
Published	Not provided
Source last updated	Oct 26, 2026, 9:30 AM EDT (2026-10-26T09:30:00-04:00)
Last retrieved by DirtyWaterWatch	Nov 4, 2026, 8:05 PM EST (2026-11-05T01:05:45Z)
Material	algal bloom (Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya limnetica; Co-dominant taxa were: Raphidiopsis raciborskii and Planktolyngbya limnetica; Co-dominant taxa were: Dolichospermum circinale and Planktolyngbya contorta; mixed algae; no dominant species in sample; Co-dominant taxa were: Planktolyngbya limnetica and Planktolyngbya contorta; Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya spp.; Dominant taxon: Microcystis aeruginosa; Dominant taxon: Planktolyngbya contorta)
Volume, in gallons	Not provided
Volume as reported	Not provided
How volume was determined	not stated whether estimated or measured
Authority	Florida Department of Environmental Protection (Algal Bloom Sampling)
Advice	Not provided
Advice period, in hours	Not provided
Basis of the advice period	Not provided
Original notice	https://services1.arcgis.com/nRHtyn3uE1kyzoYc/arcgis/rest/services/AlgalBloom_Final_View/FeatureServer/0/query?where=globalid%3D%277c7b6751-9b94-4374-895e-eb7026bf1e2a%27&outFields=objectid,globalid,SampleDateTime,MonitoringGroupPublicFacing,County,esrignss_latitude,esrignss_longitude,BloomObserved,MeterReadingsOnly,SampleDepthDesc,AnalyzedBy,AlgalIDResult,ToxinPresent,Microcystin,OtherToxin,locationString,EditDate,CyanobacteriaDominant&f=json

Original source data

{
  "site": "Lake Thonotosassa - South Shore",
  "site_key": "lake thonotosassa south shore",
  "county": "Hillsborough",
  "group": "SWROC",
  "visits": [
    {
      "time": "2025-12-09T11:15:00-05:00",
      "globalid": "7c7b6751-9b94-4374-895e-eb7026bf1e2a",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "2.5",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya limnetica",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:35:13.620000-05:00"
    },
    {
      "time": "2025-12-29T09:35:00-05:00",
      "globalid": "f3ee755c-fcc7-49c3-8925-107329bade79",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.7",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Raphidiopsis raciborskii and Planktolyngbya limnetica",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:35:24.046000-05:00"
    },
    {
      "time": "2026-01-08T08:20:00-05:00",
      "globalid": "27de486a-1e30-43d2-87cc-7eb907301770",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.5 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.)",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Dolichospermum circinale and Planktolyngbya contorta",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:35:29.751000-05:00"
    },
    {
      "time": "2026-02-02T12:15:00-05:00",
      "globalid": "2fb72d77-5989-4e6f-aa38-13d400f98143",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.4 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.)",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:35:41.204000-05:00"
    },
    {
      "time": "2026-02-17T08:35:00-05:00",
      "globalid": "45b24e2d-e617-4c2f-b810-52114d46884d",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.2 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.)",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:35:46.020000-05:00"
    },
    {
      "time": "2026-02-26T09:25:00-05:00",
      "globalid": "e100e799-1117-4a11-a232-81f8819fbeec",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.8 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.)",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:35:53.606000-05:00"
    },
    {
      "time": "2026-03-12T13:00:00-04:00",
      "globalid": "1f8270dc-a15f-4b96-8d72-14a3d78333c3",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "2.5",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Planktolyngbya limnetica and Planktolyngbya contorta",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-04-23T16:30:33.290000-04:00"
    },
    {
      "time": "2026-03-24T13:30:00-04:00",
      "globalid": "842401a2-f849-434e-bb5a-5216a2350169",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.1 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.)",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya limnetica",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:36:07.710000-05:00"
    },
    {
      "time": "2026-04-07T15:00:00-04:00",
      "globalid": "840030a5-4cd1-4e79-bdae-89181a6ea8cb",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.1 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.)",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:36:12.955000-05:00"
    },
    {
      "time": "2026-04-22T16:10:00-04:00",
      "globalid": "12a29242-c970-4dcb-b2e6-c1113fcad278",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.4 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.)",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:36:25.515000-05:00"
    },
    {
      "time": "2026-05-04T12:40:00-04:00",
      "globalid": "f484550f-154e-4f4e-9aa9-bcb2193a4f5a",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.9",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya spp.",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-05-15T18:21:13.343000-04:00"
    },
    {
      "time": "2026-05-18T11:10:00-04:00",
      "globalid": "8791e3ac-a08f-49e1-afb9-882e2654979f",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.8",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:36:41.923000-05:00"
    },
    {
      "time": "2026-06-01T12:10:00-04:00",
      "globalid": "f8f2b527-cb5a-4534-a00d-b57862b17f65",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.9 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.)",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:36:50.196000-05:00"
    },
    {
      "time": "2026-06-16T12:10:00-04:00",
      "globalid": "28e63821-3f3d-40a2-9d2d-0054b6c14c9a",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "2.0",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:37:01.985000-05:00"
    },
    {
      "time": "2026-06-25T09:55:00-04:00",
      "globalid": "47b2cbe1-56cb-4f9e-8246-1c8132c91d95",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "2.4",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:37:11.058000-05:00"
    },
    {
      "time": "2026-07-09T09:30:00-04:00",
      "globalid": "14b39fa3-aa52-47ec-96e5-4df84be57a1d",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "2.2",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:37:23.173000-05:00"
    },
    {
      "time": "2026-07-20T09:20:00-04:00",
      "globalid": "f92f4c32-bcea-4501-a8c5-ac9a61acb569",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "3.0 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.)",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-07-31T17:35:25.348000-04:00"
    },
    {
      "time": "2026-08-03T13:20:00-04:00",
      "globalid": "baad9c83-309f-481d-8919-a242c907221e",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "2.2 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.)",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:37:44.068000-05:00"
    },
    {
      "time": "2026-08-17T13:20:00-04:00",
      "globalid": "da75ef39-1a13-46b1-94da-5c0b7f4d31dc",
      "bloom_observed": "Yes",
      "toxin_present": "No",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:37:55.494000-05:00"
    },
    {
      "time": "2026-09-14T09:30:00-04:00",
      "globalid": "98c01e2b-714b-48c8-97e7-4c360d2aecc5",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.1",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Dominant taxon: Microcystis aeruginosa",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:38:22.163000-05:00"
    },
    {
      "time": "2026-09-28T09:00:00-04:00",
      "globalid": "29118591-b2f9-4ddf-b71b-faad00498c80",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.1",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:38:32.003000-05:00"
    },
    {
      "time": "2026-10-12T09:15:00-04:00",
      "globalid": "0ed6bb83-b9ae-4867-9597-cc4b93c278ba",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "1.0",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:38:38.077000-05:00"
    },
    {
      "time": "2026-10-26T09:30:00-04:00",
      "globalid": "af0edd5a-f711-4cb7-8c1d-2f5c67f91fc3",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.67 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.)",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Dominant taxon: Planktolyngbya contorta",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "SWROC",
      "edited": "2026-11-04T02:38:48.224000-05:00"
    }
  ],
  "basis": "Florida DEP observed an algal bloom, or found an algal toxin, in a sample at this site. This is a sampling result, not a health advisory; the Florida Department of Health issues health alerts separately."
}

Staff names, email addresses and phone numbers are removed from source data before it is stored.