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Water Monitoring 


**Before using the information below, special attention should be given to the

date/time & disclaimers of the data and products being displayed.**

HAB Monitoring in

Lake Erie

HAB Monitoring for

Public Water Systems

HAB Monitoring for

Recreational Waters

GLERL Experimental Archived Real-Time Measurements

GLERL Archived Real-Time Data Experimental

Ohio EPA Public Water System Monitoring

Ohio EPA Public Water System Monitoring

Ohio Department of Health BeachGuard Beach Advisories

Ohio Department of Health Beach Guard Beach Advisories

Great Lakes Observing System

Great Lakes Observing System Data Portal

GLERL Experimental Cleveland Hypoxia Warning System


USGS Nowcast Beach Status

USGS Nowcast Beach Status

GLERL Weekly and Archived Microsystin Sampling Data

GLERL Weekly and Archived Monitoring

Toledo Public Utilities: Water Quality

Toledo Public Utility Water Quality

Ohio Information for Recreational Waters

Ohio EPA Information for Recreational Waters

Ohio Sea Grant Stone Lab

Ohio Sea Grant Stone Lab Water Quality

Ohio EPA Information for Public Water Systems

Ohio EPA Information for Public Water Systems




Additional Information

 NOAA Experimental Lake Erie Harmful Algal Bloom (HAB) Tracker

The NOAA Experimental Lake Erie Harmful Algal Bloom (HAB) Tracker is a forecast model in development that shows where the blooms are, how big they are, and where they are likely headed in Lake Erie. Similar to a weather forecast, this new tool provides a daily HAB update and a five day outlook. This forecast is based on satellite imagery, weather forecast information, and modeled currents in Lake Erie during the bloom season. The HAB Tracker is updated daily with forecast currents, and the position of the bloom is updated when a cloud-free satellite image is available. The HAB Tracker also predicts the vertical distribution of buoyant Microcystis colonies, which provides information on when the bloom is likely to form surface scums versus mixing from surface to bottom. To see the HAB tracker visit GLERL

Experimental Lake Erie Harmful Algal Bloom (HAB) Tracker



Seasonal Forecast for 2017

Lake Erie Harmful Algal Bloom Forecast

The 2017 severity forecast for Lake Erie’s harmful algal bloom ranges from 6 to 9.5 (red bar). The green bars are the measured severity for past blooms. Credit: NOAA


Lake Erie has been plagued by a steady increase of HABs over the past decade. These blooms consist of cyanobacteria or blue-green algae, which are capable of producing toxins that pose a risk to human and animal health, foul coastlines, and impact communities and businesses that depend on the lake. NOAA researchers, with their partners at Heidelberg University, produce an experimental seasonal outlook of the potential severity of the bloom. 

Lake Erie Harmful Algal Bloom Seasonal Forecast July 17, 2017

On July 13th, NOAA announced the harmful algal bloom forecast for the cyanobacteria in western Lake Erie for summer 2017. A significant harmful algal bloom is expected, with an ensemble of models giving a mean severity index of 7.5, and possible range between six and 9.5. An index above 5 indicates a potentially harmful bloom. The severity index is based on a bloom’s biomass-the amount of the harmful cyanobacteria-over a sustained period. The largest blooms, 2011 and 2015, were 10 and 10.5. The severity of the bloom is not necessarily an indication of how toxic it is, and we are currently working on ways to forecast toxicity. For more information see the forecast here an the news article here


Archived Information 

HAB Bulletins from April 2009-July 2017 from NCCOS

HAB Bulletins from July 2017-Present from CO-OPs