Swimmers weren’t warned about nearly 30 high E. coli tests at beaches this summer

By: Cami Koons

Outlets: Iowa Capital Dispatch

Published: November 6, 2026

Words: 1,640

Last Updated: 3 days, 22 hours ago

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There were 27 instances this summer when a single sample test for E. coli at a state beach came back above the state standard, but state regulators did not issue a swim advisory for the beach.

The Iowa Department of Natural Resources tests lake water at state park beaches for E. coli and cyanobacteria toxins from green-blue algae, weekly from Memorial Day weekend through Labor Day weekend. The department issues swim advisories …

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