What they put in the water

So, some workers in Bellaire, Ohio accidentally put less toxic than normal chemical in the water supply, but they had to purge it. They put in 40 pounds of Hydrochloric acid (found in your stomach) instead of an unknown normal quantity of Flouride.

What harm could a lower pH really do?  Clean out some pipes, or are they worried about dissolved lead? All of the calcium buildup would buffer it out quickly anyway.

People just don't understand Chemistry these days, do they?