There are some established effects, and none of them are good - to be very clear - but my general understanding is that the effects don't seem to be super super significant, though there's a lot we don't know. I'd certainly support efforts to reduce and eliminate them from the environment, including drinking water, but I think the amount of paranoia and fear (that will absolutely be exploited by corporations) is probably a bit overblown. If there were obvious and clear direct health risks, I imagine we'd have noticed them by now, though again, there's a lot we don't know.
To put it another way, is the risk so great that I think every family should spend $30 on a filter every few months? Probably not, but I know plenty of companies will cheerfully sell you them anyway just to make people feel better about it.