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Cyanobacteria advisory (harmful blue-green algae) reported, Mar 16, 2023

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 39b23161-4753-48cc-9889-946358e62c9b, updated by the source Oct 26, 2026, 12:05 PM EDT, retrieved 2026-11-05 01:05 UTC · Read the original notice

Current status from this report

Discharge or advisory reported not linked to a mapped water: Official advisory in effect. Current rule period ends Nov 9, 2026, 11:05 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 Howell - NW Shore”. Location: 28.64335, -81.31778; location source: given in the source record, accurate to about 10 metres.

2. Waters named in the notice

The notice names: “Lake Howell”. Not linked to a mapped water.

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.

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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
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
Last retrieved by DirtyWaterWatch

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 (Dominant taxon: Microcystis aeruginosa; Co-dominant taxa were: Microcystis aeruginosa and Microcystis wesenbergii; Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya limnetica; Co-dominant taxa were: Microcystis aeruginosa and Microcystis sp.; Co-dominant taxa were: Microcystis aeruginosa and Raphidiopsis raciborskii; Dominant taxon: Planktolyngbya limnetica; mixed algae; no dominant species in sample; Co-dominant taxa were: Microcystis aeruginosa and Botryococcus braunii; Co-dominant taxa were: Raphidiopsis raciborskii and Planktolyngbya limnetica)”

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

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
39b23161-4753-48cc-9889-946358e62c9b
Original notice
Read the original notice
Earlier version
None: this is the first record
Later versions
None

Record details

Record details
Record identifierfl-dep-habs:39b23161-4753-48cc-9889-946358e62c9b
Source identifierfl-dep-habs
Source record number39b23161-4753-48cc-9889-946358e62c9b
Earlier versionNot provided
TypeCyanobacteria advisory (harmful blue-green algae)
Status in the reportAdvisory active
Sewer operator identifierNot provided
Sewer operatorNot provided
Federal wastewater discharge permit (NPDES)Not provided
Outlet numberNot provided
Outlet nameLake Howell - NW Shore
Water named in the reportLake Howell
Linked watersNot provided
How this report was linked to the waternot linked to a mapped water
Latitude28.643
Longitude-81.318
Location sourcegiven in the source record
Location accuracy, in metres10
StartedMar 16, 2023, 1:22 PM EDT (2023-03-16T13:22:00-04:00)
EndedNot provided
Detail provided by the sourceto the minute
Reported to the sourceNot provided
PublishedNot provided
Source last updatedOct 26, 2026, 12:05 PM EDT (2026-10-26T12:05:00-04:00)
Last retrieved by DirtyWaterWatchNov 4, 2026, 8:05 PM EST (2026-11-05T01:05:45Z)
Materialalgal bloom (Dominant taxon: Microcystis aeruginosa; Co-dominant taxa were: Microcystis aeruginosa and Microcystis wesenbergii; Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya limnetica; Co-dominant taxa were: Microcystis aeruginosa and Microcystis sp.; Co-dominant taxa were: Microcystis aeruginosa and Raphidiopsis raciborskii; Dominant taxon: Planktolyngbya limnetica; mixed algae; no dominant species in sample; Co-dominant taxa were: Microcystis aeruginosa and Botryococcus braunii; Co-dominant taxa were: Raphidiopsis raciborskii and Planktolyngbya limnetica)
Volume, in gallonsNot provided
Volume as reportedNot provided
How volume was determinednot stated whether estimated or measured
AuthorityFlorida Department of Environmental Protection (Algal Bloom Sampling)
AdviceNot provided
Advice period, in hoursNot provided
Basis of the advice periodNot provided
Original noticehttps://services1.arcgis.com/nRHtyn3uE1kyzoYc/arcgis/rest/services/AlgalBloom_Final_View/FeatureServer/0/query?where=globalid%3D%2739b23161-4753-48cc-9889-946358e62c9b%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 Howell - NW Shore",
  "site_key": "lake howell nw shore",
  "county": "Seminole",
  "group": "CEROC",
  "visits": [
    {
      "time": "2023-03-16T13:22:00-04:00",
      "globalid": "39b23161-4753-48cc-9889-946358e62c9b",
      "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": "Dominant taxon: Microcystis aeruginosa",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:20:27.157000-05:00"
    },
    {
      "time": "2024-05-23T11:21:00-04:00",
      "globalid": "1a86520b-cd2c-44eb-9789-9fde0e1f6e80",
      "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: 0.68; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Microcystis wesenbergii",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:27:09.600000-05:00"
    },
    {
      "time": "2024-06-10T14:19:00-04:00",
      "globalid": "90f8827a-131f-486d-9855-220853f610f2",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.57 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: 0.28 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.); Cylindrospermopsin: 0.69; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Microcystis wesenbergii",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:27:35.292000-05:00"
    },
    {
      "time": "2024-06-26T13:05:00-04:00",
      "globalid": "5eca40a5-666e-44e5-bd09-cd0efe973899",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: 1.1; Cylindrospermopsin: 1.8; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya limnetica",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:27:57.977000-05:00"
    },
    {
      "time": "2024-07-10T14:44:00-04:00",
      "globalid": "1f3e430b-3acd-4cf6-8f52-e0b379a94940",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.51 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: 2.8; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Dominant taxon: Microcystis aeruginosa",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:28:14.357000-05:00"
    },
    {
      "time": "2024-07-31T11:04:00-04:00",
      "globalid": "ba2acc32-3319-403a-9a94-0c6dc268e5f2",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.22 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: 1.9; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Microcystis wesenbergii",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:28:46.575000-05:00"
    },
    {
      "time": "2024-08-19T12:45:00-04:00",
      "globalid": "5c891b2f-2129-4f1a-a3b7-076af4f07fa9",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.10 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: 1.0; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Microcystis sp.",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:29:00.342000-05:00"
    },
    {
      "time": "2024-09-09T10:48:00-04:00",
      "globalid": "72eb50b3-29ae-4c5e-b322-dfce00785b44",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: 0.37 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.); Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Dominant taxon: Microcystis aeruginosa",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:29:25.979000-05:00"
    },
    {
      "time": "2024-09-30T10:42:00-04:00",
      "globalid": "733d08ee-2193-4632-8f43-df5f721d3d62",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: 0.15 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.); Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Dominant taxon: Microcystis aeruginosa",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:29:43.522000-05:00"
    },
    {
      "time": "2024-10-23T12:00:00-04:00",
      "globalid": "614aaab6-2bbd-475c-b936-91c38586fd72",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: 0.12 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.); Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Dominant taxon: Microcystis aeruginosa",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:30:06.954000-05:00"
    },
    {
      "time": "2024-11-12T10:19:00-05:00",
      "globalid": "91f77de7-d212-4b45-89e4-3f3161274acd",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: 0.13 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.); Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Dominant taxon: Microcystis aeruginosa",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:30:18.258000-05:00"
    },
    {
      "time": "2024-12-02T10:32:00-05:00",
      "globalid": "48b43e47-a735-46ce-88be-98372a076ad6",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: 0.11 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.); Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Raphidiopsis raciborskii",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:30:29.728000-05:00"
    },
    {
      "time": "2025-01-02T12:30:00-05:00",
      "globalid": "9445a0c0-453a-4ab2-8de1-fcfa6dcfee1d",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: 0.11 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.); Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Raphidiopsis raciborskii",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:30:42.675000-05:00"
    },
    {
      "time": "2026-06-03T09:34:00-04:00",
      "globalid": "df4564e0-d2ca-4312-863f-4a173f7361b6",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.92 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: 0.72 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.); Cylindrospermopsin: 0.68; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya limnetica",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:36:53.239000-05:00"
    },
    {
      "time": "2026-06-17T10:51:00-04:00",
      "globalid": "50a40838-663c-47ef-a054-bcc18b2bd09d",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.26 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: 0.60 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.); Cylindrospermopsin: 1.0; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Dominant taxon: Planktolyngbya limnetica",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:37:03.241000-05:00"
    },
    {
      "time": "2026-07-08T10:58:00-04:00",
      "globalid": "e0aa3ae7-6162-4358-9839-07520f1063ae",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.57 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: 1.2; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Planktolyngbya limnetica",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:37:22.386000-05:00"
    },
    {
      "time": "2026-07-21T10:57:00-04:00",
      "globalid": "c8a5937f-a5bd-484e-adc5-90de5515c7c3",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.38 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: 1.0; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "mixed algae; no dominant species in sample",
      "cyanobacteria_dominant": "No",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:37:33.001000-05:00"
    },
    {
      "time": "2026-08-05T14:40:00-04:00",
      "globalid": "0baae9b9-9fc9-43ba-8e4f-8296a832c627",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.28 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: 0.96; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Botryococcus braunii",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:37:46.942000-05:00"
    },
    {
      "time": "2026-08-19T13:36:00-04:00",
      "globalid": "bb540dea-49d8-4ca6-9399-a083cfca512e",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.12 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: 0.67; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Raphidiopsis raciborskii",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:38:00.443000-05:00"
    },
    {
      "time": "2026-09-09T10:37:00-04:00",
      "globalid": "02373243-5111-44c5-8d0a-cb03f003a079",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: 0.65; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Raphidiopsis raciborskii",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:38:20.303000-05:00"
    },
    {
      "time": "2026-09-24T11:32:00-04:00",
      "globalid": "9f0e2537-6a59-4f88-8644-8c73feed13f4",
      "bloom_observed": "No",
      "toxin_present": "Yes",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: 0.62; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Raphidiopsis raciborskii and Planktolyngbya limnetica",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:38:31.753000-05:00"
    },
    {
      "time": "2026-10-12T13:14:00-04:00",
      "globalid": "b8717bc9-d966-43bb-92a0-7ea3e87fc3ce",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: 0.32 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.); Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Raphidiopsis raciborskii",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:38:39.489000-05:00"
    },
    {
      "time": "2026-10-26T12:05:00-04:00",
      "globalid": "8461c910-269e-4783-a879-f7c6fe37f8ea",
      "bloom_observed": "No",
      "toxin_present": "Yes",
      "microcystin": "not detected",
      "other_toxins": "Anatoxin-a: not detected; Cylindrospermopsin: 0.21 I (I qualifier indicates that the reported value is between the laboratory method detection limit and the laboratory practical quantitation limit.); Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Raphidiopsis raciborskii and Planktolyngbya limnetica",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "CEROC",
      "edited": "2026-11-04T02:38:49.018000-05:00"
    }
  ],
  "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.