Originally Posted by Taichiliberal tritium Investigation into Tritium Contamination at Vermont Yankee Nuclear Power Station ..... To date, nine out of a total of 31 groundwater monitoring wells are testing positive for tritium. Generally, the trends are downward. For example, the highest wells were near 1,000,000 picocuries per liter (pCi/L) for tritium a year ago. These were wells near the AOG tunnel and AOG building. At the end of 2010, the highest levels were near 500,000 pCi/L from wells about halfway between plant buildings and the river. Now the highest tritium levels are about 125,000 pCi/L from wells near the river.