Although tribal members and researchers have been raising concerns about this contamination for decades, federal and state governments have failed to consistently monitor the waters of the Columbia River Basin for pollution in fish. Given the gaps in testing, ProPublica and Oregon Public Broadcasting did their own, revealing levels of contaminants in Columbia River salmon that, when consumed at average tribal rates, would be high enough to put many of the 68,000 tribal members living in the basin at risk of adverse health impacts.