I recently had to dump a batch of beer I made last month due to my tongue feeling numb and having this weird plastic taste to the beer. I recently read a post from more beer stating that Water companies are adding chloramine to water as a disinfectant, and how chloramine will react with malt and create chlorophenols.
Here is the article on More Beer http://morebeer.com/articles/removing_chloramines_from_water.
I'm thinking that I had filtered my water to fast and didn't get enough of the compounds out of the water which then reacted to my beer.
Here is the DWPs website on the chloramine expansion project. https://www.ladwp.com/ladwp/faces/wcnav_externalId/a-w-fctsheet-brochers...