| Statistics | 2020 | 2016-2017 | 2020 | ||||||
| Census Data | Violations Cl− | TTHM | Cl− TTHM | TTHM | |||||
| Population | Income | Systems | Total | [ppm] | [ppb] | [ppm] | [ppb] | % Change | |
| Mean (M) | 5,188,028 | $66,383 | 20,319 | 44,875 | 1.9 | 26.7 | 2.0 | 22.9 | 13.7% |
| Standard Error | 1.1E+6 | 1314 | 3352 | 9,429 | 0.3 | 5.3 | 0.3 | 4.5 | 4.0 |
| Variance | 1.5E+13 | 2.1E+7 | 1.4E+6 | 1.1E+9 | 0.8 | 303.2 | 0.8 | 239.1 | 2.0 |
| Standard Deviation (SD) | 3.8E+6 | 4553.6 | 11,614.9 | 32,662.4 | 0.9 | 18.2 | 0.9 | 15.5 | 14.4 |