The Hanford site, located in Washington state (not the U.S capital) on the Colombia River, has been spewing highly radioactive waste continually for over 50 years. Now semi-decomissioned, radioactive waste continues to leak from its 177 underground tanks containing roughly 55,000,000 gallons of highly radioactive “heavy” water. This is likely the biggest U.S. nuclear crisis you have never heard of.
Admittedly, this Fukushima style facility (of which quite a few exist in the US) has only failed to contain 68 of its 177 tanks. This crisis continues to pollute the Colombia River today, and has gotten worse as whistleblowers continued to be fired.
Uncapped fuel rods stored at the Hanford site