Largest public system
- City of Hickory: Hardness
- 16.3 mg/L
- About 1 grains per gallon: soft by USGS classes. Highest single sample (2025).
- City of Hickory (Public Utilities), 2025
- City of Hickory: TTHM (disinfection byproducts)
- 73 ppb
- Highest running annual average (2025); federal limit 80 ppb.
- City of Hickory (Public Utilities), 2025
- City of Hickory: HAA5 (disinfection byproducts)
- 31 ppb
- Highest running annual average (2025); federal limit 60 ppb.
- City of Hickory (Public Utilities), 2025