Florida / Reports /

Cyanobacteria advisory (harmful blue-green algae) reported, Aug 12, 2026

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 ca6e7588-8064-46e3-bd88-c9dfad23c176, updated by the source Aug 20, 2026, 10:45 AM EDT, retrieved 2026-11-05 01:05 UTC · Read the original notice

Read the original notice · Report an error

1. Where the advisory applies

Issued by: Florida Department of Environmental Protection (Algal Bloom Sampling). Place named: “Sixmile Creek - North of County Rd 13N”. Location: 29.96256, -81.54692; location source: given in the source record, accurate to about 10 metres.

2. Waters named in the notice

The notice names: “Sixmile Creek”. Not linked to a mapped water. Name match too far (50.2 km; limit 12.0 km: the stream record's extent (10.3 km, counted to 10 km) plus 2 km).

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

Aug 12, 2026, 9:45 AM EDT

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

Aug 20, 2026, 10:45 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 Chlamydomonas sp.; Co-dominant taxa were: Microcystis aeruginosa and Dolichospermum circinale)”

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 a water not yet on the map: Official advisory in effect, Aug 12, 2026, 9:45 AM EDT to Sep 3, 2026, 10:45 AM EDT
• No current status shown a water not yet on the map: advisory not re-confirmed by its source recently, no map colour, Sep 3, 2026, 10:45 AM EDT to Nov 10, 2026, 8:45 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

ca6e7588-8064-46e3-bd88-c9dfad23c176

Original notice

Read the original notice

Earlier version

None: this is the first record

Later versions

None

{
  "site": "Sixmile Creek - North of County Rd 13N",
  "site_key": "sixmile creek north of county rd 13n",
  "county": "StJohns",
  "group": "NEROC",
  "visits": [
    {
      "time": "2026-08-12T09:45:00-04:00",
      "globalid": "ca6e7588-8064-46e3-bd88-c9dfad23c176",
      "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: not detected; Nodularin-R: not detected; Saxitoxins: not detected",
      "taxa": "Co-dominant taxa were: Microcystis aeruginosa and Chlamydomonas sp.",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "NEROC",
      "edited": "2026-11-04T02:37:54.535000-05:00"
    },
    {
      "time": "2026-08-20T10:45:00-04:00",
      "globalid": "1b52dcb8-9eca-4bab-8488-c8f75639aa53",
      "bloom_observed": "Yes",
      "toxin_present": "Yes",
      "microcystin": "0.91 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 Dolichospermum circinale",
      "cyanobacteria_dominant": "Yes",
      "sample_depth": "SurfaceGrab",
      "group": "NEROC",
      "edited": "2026-11-04T02:38:01.585000-05:00"
    }
  ],
  "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."
}