Onondaga Lake Fish Still Unsafe Due to Mercury

A decade after a major cleanup, high mercury levels persist in the lake's fish population.

Apr. 20, 2026 at 11:29am

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A translucent X-ray photograph of a fish skeleton, with the internal structures glowing against a dark background, conceptually illustrating the persistence of mercury contamination in the lake's aquatic life.An X-ray image reveals the lingering mercury pollution inside the fish of Onondaga Lake, despite years of cleanup efforts.Syracuse Today

Despite a major cleanup effort of the Onondaga Lake bottom two decades ago, high levels of mercury contamination remain in the lake's fish population, making them unsafe for human consumption. The cleanup was intended to address the mercury pollution that had plagued the lake for years, but the problem appears to be ongoing.

Why it matters

Onondaga Lake is a popular recreational destination for fishing, and the continued presence of mercury in the fish poses a public health risk to those who consume them. This raises concerns about the effectiveness of the previous cleanup efforts and the long-term environmental impact of mercury pollution in the region.

The details

The cleanup of the Onondaga Lake bottom was ordered 20 years ago with the primary goal of making the mercury-laden fish safe to eat. However, a recent study has found that mercury levels in the lake's fish population remain high, even a decade after the cleanup was completed. This suggests that the cleanup efforts were not as effective as hoped, and that the mercury contamination is still a significant issue in the lake.

  • The cleanup of the Onondaga Lake bottom was ordered 20 years ago.
  • The cleanup efforts were completed a decade ago.

The players

Onondaga Lake

A lake located in Syracuse, New York that has been plagued by mercury pollution for years.

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What’s next

Authorities will need to investigate the reasons for the continued high mercury levels in the lake's fish and determine if additional cleanup efforts are necessary to address the problem.

The takeaway

The ongoing mercury contamination in Onondaga Lake highlights the challenges of addressing long-term environmental pollution and the need for more effective and sustained cleanup efforts to protect public health and the local ecosystem.