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250,000 gallons (if it was 10 cars and all 10 converted perfectly to HCl, and all of it went into the water supply) into a water table of, lets be conservative with 10 billion gallons, is 0.00002% concentration or .02ppm
Compare this to your stomach, which has an hydrochloric acid concentration of 5000ppm.
So yes, I would have no issue with it. All the water you drink mixes with a much higher concentration of HCl every time you drink it.
Like I said, their is a hysteria building around this and a total lack of nuance and understanding.
Problem is the only way you know if this is occurring is constant sampling and testing over the affected region by a competent and trustworthy set of testing groups.
For reference 1 inch of rain over 1 sq. mile is approximately 18 million gallons.
So even if we concentrated the full 250k gallons (remember that HCl is just one byproduct too, so we are being very generous with 250k gallons, most of the byproducts are carbon monoxide/dioxide), but 250k gallons into 1 sq mile of rain fall....138ppm
In reality this will fall over thousands of square miles too.