I am skeptical of reports published by the cities. There is incentive for the reports to skew positive, since otherwise individuals can lose elections/jobs/contracts.
So I looked back at the 2014-2016 reports from Flint, Michigan to see if they correctly predicted the water crisis.
Also note that while in the US the lead concentration limit is 15 ppb, Canada has recently reduced its limit from 10 ppb to 5 ppb. Nearly every US city I've looked at exceeds 5 ppb.
So I looked back at the 2014-2016 reports from Flint, Michigan to see if they correctly predicted the water crisis.
They did, but only very subtly.
In 2014, there was a single violation of too many total trihalomethanes: https://www.cityofflint.com/wp-content/uploads/2014/01/CCR-2...
In 2016, there were no declared violations, even though the 90th percentile sample of lead concentration (20 ppb) was over the 15 ppb limit: https://www.cityofflint.com/wp-content/uploads/City-of-Flint...
Also note that while in the US the lead concentration limit is 15 ppb, Canada has recently reduced its limit from 10 ppb to 5 ppb. Nearly every US city I've looked at exceeds 5 ppb.