The units of measure for MCLs and MCLGs shall be as follows:

1. (a) Picocuries per liter, abbreviated as pCi/L;
2. (b) Milligrams per liter, abbreviated as mg/L;
3. (c) Micrograms per liter, abbreviated as μg/L;
4. (d) Nanograms per liter, abbreviated as ng/L;
5. (e) Millirem per year, abbreviated as mrem/year; and
6. (f) Fibers per liter, abbreviated as fibers/L.

Source. #9699, eff 5-1-10; ss by #12664, eff 1-1-19; amd by #12838, eff 9-30-19