You may notice a green, red or brown film on your favorite boating or swimming area in the summer. This coloring could mean that the water is affected by harmful algal blooms. USGS scientists Dr. Barry Rosen, Dr. Jennifer Graham and Dr.
Great Lakes Water Quality
Near-real time water-quality conditions during local beach season
The U.S. Geological Survey is collaborating with State and local partners to develop models that provide real-time estimates of Escherichia coli (E. coli) (for pathogens) and (or) microcystin (for freshwater cyanotoxins) levels at Great Lakes beaches and drinking-water intakes.
Near real-time water quality conditions in Lake Erie are available during local beach season via Great Lakes NowCast.


Nutrient Management for Harmful Algal Blooms: The Importance of Nitrogen and Micronutrients in the Great Lakes
NWQP Research on Harmful Algal Blooms (HABs)
Are Naturally Occurring Algal Toxins in Water Resources a Health Hazard?
Harmful Algal Blooms (HABs)
You may notice a green, red or brown film on your favorite boating or swimming area in the summer. This coloring could mean that the water is affected by harmful algal blooms. USGS scientists Dr. Barry Rosen, Dr. Jennifer Graham and Dr.
Real-time assessments of water quality—A nowcast for Escherichia coli and cyanobacterial toxins
The "H," "A," and "B" of a HAB: A definitional framework
Detecting algal toxins and organic contaminants of concern in the environment
Cyanotoxin mixture models: Relating environmental variables and toxin co-occurrence to human exposure risk
Harmful algal blooms
Cyanobacterial harmful algal blooms and U.S. Geological Survey science capabilities
Estimating microcystin levels at recreational sites in western Lake Erie and Ohio
Developing and implementing the use of predictive models for estimating water quality at Great Lakes beaches
Harmful algal blooms
Nowcast Beach Status
The U.S. Geological Survey is collaborating with State and local partners to develop models that provide real-time estimates of Escherichia coli (E. coli) (for pathogens) and (or) microcystin (for freshwater cyanotoxins) levels at Great Lakes beaches and drinking-water intakes.
Near real-time water quality conditions in Lake Erie are available during local beach season via Great Lakes NowCast.


Nutrient Management for Harmful Algal Blooms: The Importance of Nitrogen and Micronutrients in the Great Lakes
NWQP Research on Harmful Algal Blooms (HABs)
Are Naturally Occurring Algal Toxins in Water Resources a Health Hazard?
Harmful Algal Blooms (HABs)
You may notice a green, red or brown film on your favorite boating or swimming area in the summer. This coloring could mean that the water is affected by harmful algal blooms. USGS scientists Dr. Barry Rosen, Dr. Jennifer Graham and Dr.
You may notice a green, red or brown film on your favorite boating or swimming area in the summer. This coloring could mean that the water is affected by harmful algal blooms. USGS scientists Dr. Barry Rosen, Dr. Jennifer Graham and Dr.