Feb 9, 2026 - Environment

Iowans requested a record number of nitrate test kits in 2025

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Map of the US showing a concentration of colored dots, primarily green, yellow, orange, and red, indicating varying data intensities, especially dense in the Midwest and some coasts.

A map showing nitrate test results from surface water for the Izaak Walton League of America. Green signifies nitrate at 0–3 mg/L, while red is 10 mg/L and above. Map: Courtesy of Izaak Walton League of America

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