Standing on a catwalk over a pool of water near the banks of the Ohio River, Frank Blaskovich points at a series of pipes draining into the far end of the pool.
"There, that's the river water coming in," says Blaskovich, water treatment manager for Wheeling, West Virginia.
His job is to take water from the Ohio River and make it into safe drinking water for his city of 30,000. But since 2008, the Ohio has been too salty, so he's had to dilute it with groundwater from backup wells. Blaskovich doesn't like doing this, because each added step costs money.