Home / Environment / Iowa Beaches Warn of High Bacteria Levels
Iowa Beaches Warn of High Bacteria Levels
3 Jul
Summary
- Rain events significantly increase bacteria in Iowa water bodies.
- Twenty Iowa state park beaches have faced swim advisories since May.
- High nitrate levels in rivers prompted a lawn watering ban in Des Moines.
Rain events are a primary cause of elevated bacteria levels in Iowa's water bodies. Since the end of May, twenty of Iowa's 41 state park beaches have been issued 'swimming not recommended' notices due to excessive E. coli and microcystin toxins. These advisories pose a risk for waterborne diseases, especially for vulnerable populations.
High E. coli levels often indicate the presence of other harmful bacteria. Microcystin, a toxin from cyanobacteria, suggests water bodies are stressed by high nitrogen and phosphorus levels. The Iowa Department of Natural Resources monitors these conditions weekly, categorizing beaches as 'vulnerable' or 'less vulnerable' based on historical data.
Meanwhile, Central Iowa Water Works has moved from a mandatory lawn watering ban to a reduced usage plan for over 600,000 residents in the Des Moines area. This change reflects improvements in nitrate levels in the utility's source water, though conservation efforts are still encouraged to manage ongoing challenges with elevated river nutrient concentrations.
