In 2023, Idaho used a copper-based chemical treatment on the Snake River near Twin Falls to fight invasive quagga mussels. While the goal was eradication, the outcome shows more harm than success.

The treatment caused widespread losses of native species—fish, mussels, snails, and insects were hit hard. Nearly the entire local sturgeon population was wiped out, and more than 7,000 pounds of copper settled into the riverbed, creating long-term toxicity risks.

Even with these lethal side effects, the mussels weren’t eliminated. Larvae were still detected a year later, forcing another round of chemical treatment.

This case shows why relying on aquatic chemicals is a risky approach. They may temporarily suppress invasive species, but they often leave behind long-lasting damage to ecosystems, water quality, and native wildlife. Smarter solutions are needed to protect our rivers without poisoning them.

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