Section 113861 Of Chapter 2. Definitions From California Health And Safety Code >> Division 104. >> Part 7. >> Chapter 2.

. "pH" means the symbol for the negative logarithm of the hydrogen ion concentration, which is a measure of the degree of acidity or alkalinity of a solution. Values between 0 and 7 indicate acidity and values between 7 and 14 indicate alkalinity. The value for pure distilled water is 7, which is considered neutral.