Tea leaves need to be inserted into hot water in for the leaves to draw into the water and become tea. Boston harbor was in the early stages of winter when the Boston Tea Party happened (December 17th, 1773) so that obviously didn't happen there. While the colonists did destroy a massive amount of tea ( about 92,000 pounds ) from the British East India company, there were no known repercussions in the harbor for the tea's destruction. Why? Likely because Boston harbor was and remains enormous and considering the fact that the tea could not blend in with the water anyway, the wooden chests and crates likely broke down slowly over time if other dockworkers didn't remove them once they washed ashore.

I also like to remind people that the Boston Tea Party was not the only tea party in America that took place -- it was the just the first one that started a movement. Tea Parties took place in New York, Philadelphia, Annapolis, Charleston, and more!

This isn't a history question, its just a basic math question. Based on an approximate area of 50 square miles, and an average depth of 14 feet, the Boston Harbor area is (rough order of magnitude) about 136 billion gallons of water. At 8oz a cup, that's 17.4 trillion cups of tea. You usually use a teaspoon of tea to make a fairly weak cup of tea, so that'd be 17.4 trillion teaspoons of tea to make the harbor fairly weak tea even ignoring outflow going on. Now, a quick sample of black tea I have here is 2.7g for a teaspoon, so you're talking 47 million metric tons of tea needed to do that. Now, the best I can find is that about 41 metric tons of tea was dumped (although that's hard to fathom, and admittedly that was just some quick searching). But its enough for another rough order of magnitude estimate that you're off by a factor of a million. So take an average teacup and put about 0.0000027g of tea in it, that'll show you how it was.