Stormwater pond cleanup costs to soar, maybe to $1 billion

Metro cities could be on the hood for $1 billion or more in cleanup costs in coming years as they grapple with contaminated sludge in stormwater ponds that dot the metro area. The main culprit: carcinogenic compounds known as PAHs, which until recently were found in common asphalt sealants used on driveways and parking lots.

Read more in the Minneapolis Star Tribune.