My city notified some residents of elevated levels of trihalomethane in the water, as a bi-product of disinfecting. One monitoring site recorded 81.7 ug/L while a second site recorded 89.05 ug/L, where 80.00 ug/L is the maximum allowable contaminant level. Apparently this has gone on for a about a year, and some neighbors have told me that its happened in many other years too. The director of public works says its no big deal and that I'd have to drink 2 L/day for 70 years to risk any damage as a result of trihalomethane. Trying to find answers, I ran into an EPA study project regarding THM that looks kind of alarming, but I know enough not to get freaked out just because I saw something on the internet. Should I be concerned or not?