Largest public system
- Greenville Water: Hardness
- 4.9 mg/L
- About 0.3 grains per gallon: soft by USGS classes. Average (2025).
- Greenville Water, 2025
- Greenville Water: TTHM (disinfection byproducts)
- 16.4 ppb
- Average (2025); federal limit 80 ppb.
- Greenville Water, 2025
- Greenville Water: HAA5 (disinfection byproducts)
- 15.4 ppb
- Average (2025); federal limit 60 ppb.
- Greenville Water, 2025