Ohio Algae Bloom Status

Q: Is there an algae bloom in Ohio right now?

Ohio Department of Health, BeachGuard publishes the current Ohio status on its own site and is linked on this page. This page carries when blooms normally happen here, which organisms are monitored, and the agency contacts to check before you go.

Q: Who monitors harmful algal blooms in Ohio?

Ohio Department of Health, BeachGuard, Ohio EPA harmful algal bloom programme, NOAA Lake Erie harmful algal bloom forecast, NOAA Great Lakes Environmental Research Laboratory. Ohio Department of Health, BeachGuard advisories posted as they are issued through the swimming season.. Each of them is linked on this page, with a phone number where one is published.

Q: Does clear water mean there is no bloom in Ohio?

No. The organisms monitored in Ohio do not have to discolour the water to reach the levels an agency acts on, and the toxins involved are invisible, tasteless, and not removed by cooking. Every agency on these pages says some version of the same thing: what the water looks like is not the test, and the published status is.

Q: How often is the Ohio status updated?

Ohio EPA states: "PWSs in Ohio will follow HAB SEASON monitoring requirements per their assigned schedule until the first full week of December." That is the cadence to plan around. For the situation today, the agency's own page and phone line are the answer.

What Ohio Department of Health, BeachGuard is reporting today, reproduced as issued, and when blooms normally happen on this coast.

Ohio bloom season normally runs June 1 to October 31

Usual bloom season

Jun 1 to Oct 31

Monitored by

Live agency feeds

Link only

Ohio bloom status at a glance

Agency directory

Today

When blooms normally happen in Ohio, from the agency wording quoted below. The bar is the usual peak stretch, not a forecast, and a bloom outside it is not unusual.

None reported

highest category reported

published by the agencies below

agencies that publish status

each linked below

July 15 to September 30

usual peak stretch

inside the season today

blue-green algae, the western Lake Erie bloom organism

organism monitored

Microcystis

Ohio is where the seasonal forecast actually exists. NOAA issues a Lake Erie severity forecast in early July, before the season, based on phosphorus loading from the Maumee River, and it is the only genuinely predictive harmful algal bloom product on these pages. Ohio EPA separately defines a regulatory HAB season for drinking water systems, running from the first full week of June to the first full week of December.

Live, as issued

What the agencies are reporting in Ohio right now

Every value below is reproduced from the agency that issued it, exactly as that agency wrote it, with the time attached. On a health subject the official category is the answer, and it can change from one sampling site to the next a few miles down the same coast.

Every status below is the issuing agency’s own, with the agency named and the time attached. Whether a beach is open, whether shellfish can be harvested, and any health question are answered by the agency listed for your state. If you are having trouble breathing, call a doctor.

Current Ohio status is published by Ohio Department of Health, BeachGuard on its own site. It and the other agencies listed further down are where to check before you go.

Season

When blooms normally happen in Ohio

“NOAA provides forecasts for seasonal blooms of cyanobacteria (blue-green algae) in Lake Erie, typically from July to October when warmer water creates favorable bloom conditions.”NOAA National Centers for Coastal Ocean Science, source

Two agencies give Ohio two overlapping windows and both are useful. NOAA puts the Lake Erie bloom season at typically July to October. Ohio EPA runs its drinking water HAB season from the first full week of June to the first full week of December, which is deliberately wider because a water plant cannot afford to start late.

How often the agency samples

“PWSs in Ohio will follow HAB SEASON monitoring requirements per their assigned schedule until the first full week of December.”Ohio EPA, source

Hundreds of dead fish scattered along the wrack line of a long empty sand beach, running away to the horizon — A harmful algal bloom fish kill on the Gulf coast, photographed by the National Park Service at Padre Island National Seashore in Texas. FWC associates possible fish kills with its low category, more than 10,000 cells per litre, and probable fish kills from its medium category upward. Dead fish on the sand are one of the most reliable signs available to someone standing on a beach. “Marine Harmful Algal Bloom - Fish Kill” — National Park Service — Public domain

In the agency’s own words

The sentence Ohio Department of Health, BeachGuard most wants you to read

Reproduced verbatim, in the agency’s own words.

“The Ohio Department of Natural Resources reminds all visitors to our state park beaches to check the Ohio BeachGuard website for any current water quality advisories before swimming.”Ohio Department of Natural Resources, source

Where it concentrates

Which part of the Ohio coast, and what you would notice

What people actually notice

Water that looks like spilled paint, or surface scums, mats or films, which is the wording Ohio prints on its own beach signs
Green globs floating below the surface, another phrase from the state signage rather than from us
Dogs, which are the group most often harmed by cyanobacteria because they drink the water and lick their coats afterwards
A posted orange warning placard at the access point, which means the state has detected high levels of algal toxins there

Beaches worth checking the status for

Maumee Bay State Park

Lucas County. The Ohio beach closest to the mouth of the Maumee River, which is the phosphorus source NOAA uses to project each season’s bloom severity.

East Harbor State Park

Ottawa County. One of the most visited Lake Erie state park beaches, sitting in the middle of the western basin where the bloom concentrates.

Catawba Island and Port Clinton

Ottawa County. The western basin shoreline where bloom position on any given day depends on which way the wind has been pushing it.

Sandusky Bay and Cedar Point

Erie County. A shallow warm bay at the eastern edge of the bloom footprint, with its own bloom behaviour distinct from the open lake.

Headlands Beach State Park

Lake County. Far enough east that the western basin bloom usually does not reach it, which is exactly the kind of thing a bloom position forecast is for.

A man in chest waders standing knee deep in the surf, filling a sample bottle with seawater — Coastal water sampling, photographed for the US Environmental Protection Agency at Grand Isle State Park in Louisiana. Every category on this page starts as a bottle of water like this one. FWC’s statewide counts come from routine monitoring, event response and partner sampling, which is why coverage is uneven and why an unsampled county is a gap in sampling rather than a statement about its water. “June 4, Collecting water for testing at Grand Isle State Park, La” — U.S. EPA (photo by Eric Vance) — Public domain

Beach advisories

Ohio beach advisories

Beach advisories

Recreational water advisories are issued locally, and they change without warning. The current advisory status is published by the agency below. Check it directly, every time, on the day you are going.

Ohio is landlocked, so there is no shellfish harvest closure programme here. The equivalent legal question is a recreational public health advisory on a beach, and those are issued by the Ohio Department of Health and posted to BeachGuard. Human illness reporting runs through local health districts rather than a state hotline, because Ohio public health is locally administered.

Ohio Department of Health · Official closure information

A posted algae advisory sign on a Lake Erie beach in Ohio, with an orange warning placard reading that high levels of algal toxins have been detected — A posted advisory on a Lake Erie beach in Ohio, carrying an orange placard reading “high levels of algal toxins have been detected”. Different lake and a different organism from Florida red tide, but the principle is the one that matters everywhere: the sign in front of you was put there by people who looked at that specific water today, and it outranks anything on a screen, including this page. “Algae warning sign (16832101051)” by NOAA Great Lakes Environmental Research Laboratory, CC BY-SA 2.0

Who to ask

Who to contact in Ohio

Health questions, whether a specific beach is open, and anything to do with harvesting are answered by these agencies. Each is linked, with a phone number where one is published.

Ohio Department of Health, BeachGuard

Issues recreational public health advisories for Ohio beaches and posts them to BeachGuard, which is where the state itself tells the public to look before swimming. This is the status page for Ohio, not a NOAA forecast.

Advisories posted as they are issued through the swimming season.

Official page

Ohio EPA harmful algal bloom programme

Runs the drinking water side, requiring public water systems to sample through a defined HAB season, and takes public bloom reports through an online form. Its season dates are the clearest regulatory definition of an Ohio bloom season anywhere.

Public water system HAB season monitoring runs from the first full week of June until the first full week of December.

Official page

NOAA Lake Erie harmful algal bloom forecast

Publishes an early season projection from May, a seasonal severity forecast in early July, a bloom position forecast updated twice weekly through the season, and a retrospective in November. The seasonal forecast is the single most useful thing here for anyone planning ahead.

Bloom forecast twice weekly June through October. Seasonal forecast once, in early July.

Official page

NOAA Great Lakes Environmental Research Laboratory

Publishes the Lake Erie harmful algal bloom bulletin itself, including the satellite imagery, the bloom position forecast and the vertical mixing forecast that says whether the bloom is at the surface today.

Official page

What each organism here does

Microcystis, blue-green algae, the western Lake Erie bloom organism. Produces microcystins, which agencies associate with liver and gastrointestinal effects, skin irritation, and risk to dogs that swim in or drink affected water.

Common questions

Ohio algae bloom FAQ

Is there an algae bloom in Ohio right now?

When is algae bloom season in Ohio?

NOAA National Centers for Coastal Ocean Science states: "NOAA provides forecasts for seasonal blooms of cyanobacteria (blue-green algae) in Lake Erie, typically from July to October when warmer water creates favorable bloom conditions." On that basis the usual stretch runs June 1 to October 31, with the busiest weeks July 15 to September 30. Two agencies give Ohio two overlapping windows and both are useful. NOAA puts the Lake Erie bloom season at typically July to October. Ohio EPA runs its drinking water HAB season from the first full week of June to the first full week of December, which is deliberately wider because a water plant cannot afford to start late. That is a climatological typical and not a forecast: blooms happen outside it, and some years produce very little.

Can you swim during an algae bloom in Ohio?

Ohio Department of Natural Resources publishes this wording: "The Ohio Department of Natural Resources reminds all visitors to our state park beaches to check the Ohio BeachGuard website for any current water quality advisories before swimming." That is the agency's sentence, quoted, and the agency is the authority. Whether a particular spot is open on a particular day is decided by the people posting signs at the access point, who looked at that specific water today.

Who monitors harmful algal blooms in Ohio?

Does clear water mean there is no bloom in Ohio?

Is it safe to swim at a Ohio beach during a bloom?

Ohio has no marine shellfish closure programme, and the equivalent legal instrument here is a beach advisory issued by the health department. Ohio is landlocked, so there is no shellfish harvest closure programme here. The equivalent legal question is a recreational public health advisory on a beach, and those are issued by the Ohio Department of Health and posted to BeachGuard. Human illness reporting runs through local health districts rather than a state hotline, because Ohio public health is locally administered.

Does a quiet year mean blooms are over in Ohio?

No. NOAA National Centers for Coastal Ocean Science's own framing is that these are recurring events rather than one-off ones, and the monitoring programmes behind them run whether or not there is anything to find. A season with little to report is a normal part of the pattern rather than the end of it, which is why this page leads with when blooms normally happen and only then shows what is being reported today.

How often is the Ohio status updated?

What is the difference between red tide and blue-green algae?

Red tide means a marine bloom, in the Gulf of Mexico usually Karenia brevis, which produces brevetoxins and causes respiratory irritation carried in sea spray. Blue-green algae means freshwater cyanobacteria such as Microcystis, which bloom in lakes and slow rivers and produce a different family of toxins. Different organisms, different water, different monitoring programmes, and a status for one says nothing about the other. This page covers western Lake Erie cyanobacteria.

Plan the rest of the trip

More for a Ohio coast day

Ohio beach conditionsRip current and swim risk from the NWS surf zone forecast. A different hazard, a different agency, the same beach.Ohio mosquito forecastCoastal marsh and dune ponds are mosquito habitat, and evening at the water is prime biting time.Red tide across the countryEvery state with a monitored bloom, which agency publishes it, and what they are reporting now.

Red tide and algal blooms in other states

Season windows are climatological typicals drawn from the agency quotations above, not forecasts. Whether a beach is open and whether shellfish can be harvested are answered by the agencies named above. National picture: red tide and algal bloom status across the country →
Hero image: “2018 Fort De Soto - South Beach” by Beyond My Ken, CC BY-SA 4.0