I'm reading the article you posted as well as a few others I found to explain the science, risk, and scale.

This feels like you're posting it as more alarmist than it is:

• Its not the result of industrial pollution, as it is sometimes elsewhere in the world.
• This looks like its also a small pocket of population (70,000 people according to your article which is even less than Flint Michigan at its worst)
• California is following a stricter standard double that of the Federal requirement and even then....
• ...none of the samples exceed the extra strict safe standards of 50 ppb "The highest reading from a single well came to 42 parts per billion"