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Researchers are trying to identify the role of farms in algae linked to tainted drinking water

  • 086e9c8287db7410VgnVCM200000d6c1a8c0____-Toledo Water Problems-1.jpg

    FILE - In this Aug. 3, 2014 file photo, algae is seen near the City of Toledo water intake crib in Lake Erie, about 2.5 miles off the shore of Curtice, Ohio. Environmentalists, scientists and farmers agree that agriculture runoff is feeding the blue-green algae blooms on Lake Erie that are linked to the toxins found in the drinking water of 400,000 people last weekend. But how much of a role do the farms play? Researchers know some of the answers, yet there are still many unknowns. (AP Photo/Haraz N. Ghanbari) (The Associated Press)

  • 086e9c8287db7410VgnVCM200000d6c1a8c0____-Toledo Water Problems-2.jpg

    FILE - In this Aug. 4, 2014 file photo, Toledo Mayor D. Michael Collins raises a glass of tap water before drinking it during a news conference in Toledo, Ohio. Environmentalists, scientists and farmers agree that agriculture runoff is feeding the blue-green algae blooms on Lake Erie that are linked to the toxins found in the drinking water of 400,000 people last weekend. But how much of a role do the farms play? Researchers know some of the answers, yet there are still many unknowns. (AP Photo/Paul Sancya) (The Associated Press)

  • 086e9c8287db7410VgnVCM200000d6c1a8c0____-Toledo Water Problems-3.jpg

    FILE - In this Aug. 4, 2014 file photo, Aretha Howard carries a case of bottled water to her car in Toledo, Ohio. Environmentalists, scientists and farmers agree that agriculture runoff is feeding the blue-green algae blooms on Lake Erie that are linked to the toxins found in the drinking water of 400,000 people last weekend. But how much of a role do the farms play? Researchers know some of the answers, yet there are still many unknowns. (AP Photo/Paul Sancya) (The Associated Press)

  • 086e9c8287db7410VgnVCM200000d6c1a8c0____-Toledo Water Problems-4.jpg

    FILE - In this Aug. 3, 2014 file photo, Ohio Air National Guard Senior Airman Nick Wander fills a 400 gallon military water buffalo with fresh drinking water at Woodward High School in Toledo, Ohio. Environmentalists, scientists and farmers agree that agriculture runoff is feeding the blue-green algae blooms on Lake Erie that are linked to the toxins found in the drinking water of 400,000 people last weekend. But how much of a role do the farms play? Researchers know some of the answers, yet there are still many unknowns. (AP Photo/Haraz N. Ghanbari) (The Associated Press)

The findings of a toxin in the drinking water supply of 400,000 people in Ohio and southeastern Michigan a week ago is putting a big spotlight on how it got there.

Scientists and farmers agree that phosphorus from agriculture runoff is feeding the blue-green algae blooms on Lake Erie linked to the toxin.

Political leaders are calling for more studies to find out why the blooms are increasing and how to control them. But a number of environmental groups say it's time for strict regulations on the agriculture industry.

Researchers say it is clear phosphorus is coming from farmland, but it's much more difficult to pin down exactly where and why.

Ohio's agriculture leaders say they're committed to finding those answers and research is underway to see what works best.