Harmful Algae Bloom

Hazard in Agriculture

A water-quality hazard of toxic blooms that close lakes, threaten drinking water and harm pets, livestock and wildlife.

Plans also call it: HAB, red tide, cyanobacteria bloom, blue-green algae, harmful algal bloom

Talk to us about Harmful Algae BloomAll 73 hazards →

What you’d hand your council

The first page of a Harmful Algae Bloom evidence brief: likelihood, impact and readiness on your own scale, every figure sourced.

Evidence brief for Cedar Ridge County (example)

September 14, 2026

Harmful Algae Bloom

Hazard in Agriculture, on the established threats & hazards list

Impact
5432112345

Likelihood

Likelihood
3

Possible — Expected occasionally — roughly once in 10 to 50 years (2–10% chance in any year).

Impact
3

Moderate — Notable effects — injuries possible, damage in multiple areas, essential services disrupted for days.

Readiness
4

High — The organization has a well-developed capability to manage this threat or hazard. Plans, personnel, resources, and skills are largely in place, and the capability has been meaningfully tested or demonstrated. Remaining gaps are unlikely to significantly impair performance.

  • 2source documents
  • 58verified mentions
  • —federal declarations
  • —NRI risk score
Worked example: Cedar Ridge County is fictional. The scores illustrate the format and are nobody's decision. Open a full sample brief →

The national record

FEMA’s National Risk Index doesn’t model Harmful Algae Bloom. Your team fills it with local evidence, and Hazzard shows the gap rather than a zero.

How it maps

The same hazard in the vocabularies your plan and FEMA already use.

FEMA National Risk Index
Not covered
FEMA declaration incident type
Not covered
NOAA Storm Events type
Not covered
Hazzard category
Agriculture, disease and living systems

The national record

What the federal data says about Harmful Algae Bloom: nothing yet

No federal dataset scores Harmful Algae Bloom or files declarations under it. That's common for threats and emerging hazards, and it's why a brief for Harmful Algae Bloom is built from your own plans, exercises and records. Hazzard shows the gap instead of inventing a number.

In your plan

What a Harmful Algae Bloom profile needs, and where each part comes from

A local hazard mitigation plan profiles each hazard the same way (44 CFR 201.6). Here is how Hazzard fills each part for Harmful Algae Bloom.

  1. Location

    44 CFR 201.6(c)(2)(i)

    Your documents

    No national layer maps Harmful Algae Bloom. We draw the geographic extent from your plans, studies and annexes, cited to the page.

  2. Extent

    44 CFR 201.6(c)(2)(i)

    Your documents

    The magnitude your plans use for Harmful Algae Bloom (a scale, a depth, an acreage, a duration), read from your documents and cited, so the profile states the strength you plan for.

  3. Previous occurrences

    44 CFR 201.6(c)(2)(i)

    Your documents

    FEMA files no declaration type for Harmful Algae Bloom. The history comes from your after-action reports, incident records and plans.

  4. Probability of future events

    44 CFR 201.6(c)(2)(i)

    Your team decides

    No national dataset gives a frequency for Harmful Algae Bloom. Your team scores likelihood on your scale from the evidence we organize.

  5. Vulnerability and impacts

    44 CFR 201.6(c)(2)(ii)

    Your documents

    The Census population profile and HHS emPOWER counts for context; the consequences themselves come from your plans and exercises.

  6. The assessment itself

    Your team decides

    Likelihood, impact and readiness for Harmful Algae Bloom are drafted with every source attached, and a person on your team accepts each one. Hazzard never records a score on its own.

How we can help

How we’d help you prepare for Harmful Algae Bloom

  1. 1

    We pull your climate record

    NOAA's daily temperature and precipitation record for your county, and NRI's agricultural losses where FEMA models them.

  2. 2

    We read the plans you already have

    Your mitigation plan and any agricultural or water-quality material, so what they say about Harmful Algae Bloom is cited.

  3. 3

    You leave with a cited brief

    Likelihood, impact and readiness for Harmful Algae Bloom on your own scale, every figure tied to its source, ready for the planning team or the council.

Also in Agriculture

Preparing for Harmful Algae Bloom

Give Harmful Algae Bloom a place in the plan with the record behind it.

Agricultural hazards move slowly and cost a great deal. We connect your climate record and your plans so the assessment reflects the land your economy depends on. A person replies within one business day.

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