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.
I would take their data with a grain of salt. It's basically a viral marketing site for filter manufacturers and they're biased toward showing scary numbers. My city has two water sources depending on where you're located and they don't break down the figures to that level of detail but the county water quality report does.