WasteWATER*. I hate when titles leave important things out to make them sound worse than they are. This is about WATER waste.
If the title had said "a million tons of tritium" it would be wrong, but it didn't.
The legal limit for tritium emissions for a nuclear plant in the US is a total of 0.2kg per year according to NRC. A metric ton is 1000kg. In order to get a million tons you would need 5x10^9 nuclear plants all releasing their maximum amount of tritium. If the amount would then be as diluted as in the article, ie 860,000 tons water for every 2.1 gram, you would then need 4*10^18 tons of water. There isn't enough water on earth to do so.
The article's title makes it sound like they're just going to dump the Elephant Foot directly into the pacific. It's clearly a sensationalistic anti-nuclear title edit.
To start, seawater has more things than water. Both Hydrogen and Oxygen have isotopes that can decay and emit radioactivity, so yes, water can definitely be radioactive, by definition. For a relatively short time because is not plutonium of course, but it can be.
And, unlike Plutonium, the problem is that life beings are mostly made of water and we didn't coevolved with a such rare element as tritium is in nature. Water is freely allowed to enter and travel and has granted access to every part of the human body. We trade a big danger for other, but this does not mean that radioactive water can't harm us.
"Is not a danger" here means "we don't know and, as long as liability is impossible to be traced back to us, we don't care".
It’s one of the least dangerous radioisotopes out there, so I’m not particularly fussed, but it is incorrect to say water can’t be radioactive.
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