When I came to Chengdu in the year 2000, we were all told not to drink the water without boiling, and even to be cautious brushing our teeth. But a few years back my wife did mention that Chengdu was pretty proud that it had potable water.
That being said, I’ve also never been brave enough to take a sip of un-pasteurized Chengdu tap-liquid.
And just for those of us not in the bubble, my China Air Quality App showed the U.S. Consulate figure at 395 at 23:00. Good times.