Rapid City

Pennington County, South Dakota

100 Excellent

Water Quality Score

100/100

Grade

Water Systems

Population

77,503

Key Contaminants

Gross Alpha Particle Activity

13.9649 / 15 pCi/L

0 pCi/L MCL: 15 pCi/L

Nitrite

0.6261 / 1 mg/L

0 mg/L MCL: 1 mg/L

Barium

1.052 / 2 mg/L

0 mg/L MCL: 2 mg/L

PFAS (Per- and Polyfluoroalkyl Substances)

0.0018 / 0.004 μg/L

0 μg/L MCL: 0.004 μg/L

Chlorine

1.5396 / 4 mg/L

0 mg/L MCL: 4 mg/L

Trichloroethylene (TCE)

1.1742 / 5 μg/L

0 μg/L MCL: 5 μg/L

Radium-228

0.651 / 5 pCi/L

0 pCi/L MCL: 5 pCi/L

PFOA (Perfluorooctanoic Acid)

0.0005 / 0.004 μg/L

0 μg/L MCL: 0.004 μg/L

Water quality can vary by neighborhood in Rapid City.