Japan has a huge environmental problem, and it'll only get bigger until they do something about it.

Some 620,000 tons of radioactive water have been filtered in recent months , Nautilus reported. But that doesn't mean the water is toxin-free, and the radioactive version of hydrogen known as tritium will be extremely difficult and expensive to remove, the report added. What's more, the tainted water grows in volume every day.

"More than four years after the disaster, pumps still must pour a constant stream of water into the pressure vessels that contain the radioactive cores," the Nautilus report said. "But the meltdowns and explosions rendered those vessels leaky, so TEPCO collects the water that seeps out, as well as rainwater that flows down the hills and through the shattered buildings."

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Pictured are several of the water storage tanks at the Fukushima nuclear plant.

(EPA Photo)

That means to hold all this toxic water, Gizmodo said, and workers are continuously building more to keep up with the flow of contaminated waste. Even worse, some of these tanks have leaked the radioactive water, leading to even more concerns in an area that has already been abandoned by residents, the report added.

Officials have proposed a possible solution for getting rid of the tritiated water: dump it in the oceans. Nautilussays tritium isn't believed to be all that dangerous to humans, and the ocean is so vast that the tritiated water would dilute before it reached most of the fish population, the report added.

"If released into the ocean, the contaminated water would quickly be diluted, and it wouldn’t bioaccumulate in fish (unlike strontium-90, for example, which is taken up by bones)," Nautilus said.

But the EPA wants to take another look at tritiated water , Scientific American said. For now, the water will continue to be stored in the ever-growing field of tanks near the plant, and officials say they'll wait for further studies to be performed on the safety of dumping tritiated water into the Pacific Ocean.

The March 2011 earthquake and subsequent tsunami killed more than 15,000 people and sent countless pieces of debris into the ocean. Some of that wreckage has begun to wash up on North American shores, , as it drifts along with the ocean currents, but Japanese utility company TEPCO has said dumping the contaminated water into the Pacific won't affect other nations, Gizmodo also reported.

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A photo of daisies growing near Japan's Fukushima nuclear disaster site, posted by Twitter user @san_kaido.