Ideally measuring between 6.5 to 8.5, pH levels indicate how acidic or basic your water is. Water that's too acidic or too basic can corrode pipes, affect taste, or irritate the skin and eyes when used for bathing.
Optimal
7.0 - 8.0
Cautionary
6.5 - 6.9 or 8.1 - 8.5
Hazardous / Out of Range
<6.5 or >8.5