Missouri is preparing to update its water quality standards for ammonia for the first time in more than 20 years, a change that could mean steep costs for small towns with lagoon wastewater systems.

In 2013, the Environmental Protection Agency recommended stricter limits after new research showed mussels, snails and other aquatic life are more sensitive to ammonia than previously understood.

“EPA included additional species in its calculations, and the new recommendations are stricter than what’s in our current regulations,” said Mike Kruse, environmental program manager for the Missouri Department of Natural Resources’ Watershed Protection Section. “We’re proposing to adopt those standards to better protect aquatic life in Missouri streams and lakes.”

Unlike a single fixed number, ammo

See Full Page