Largest public system
- Charlotte Water: Hardness
- 32 mg/L
- About 1.9 grains per gallon: soft by USGS classes. Average (2025).
- Charlotte Water (City of Charlotte), 2025
- Charlotte Water: TTHM (disinfection byproducts)
- 63.7 ppb
- Highest running annual average (2025); federal limit 80 ppb.
- Charlotte Water (City of Charlotte), 2025
- Charlotte Water: HAA5 (disinfection byproducts)
- 22.9 ppb
- Highest running annual average (2025); federal limit 60 ppb.
- Charlotte Water (City of Charlotte), 2025