The specific conductance of Roraing Creek ranges from 11 micro-siemens per centimeter at site 2 to 127 micro-siemens per centimeter at site 4. In 2003 and 2004, the pH of the creek ranged from 7.0 to 7.2. In a later survey, it was found to be acidic at sites 1 and 2 (6.50 and 6.89, respectively), but alkaline at sites 3 and 4 (7.34 and 8.27, respectively). The concentration of alkalinity in the creek ranges from 5.1 milligrams per liter at site 1 to 32 milligrams per liter at site 2. The concentration of water hardness ranges from 28 milligrams per liter at river mile 4.04 to 44 milligrams per liter at river mile 8.54. The discharge of the creek is 12.2 liters per second at site 1, 243.5 liters per second at site 2, 216.7 liters per second at site 3, and 271.6 liters per second at site 4.