Rapid City Tap Water Quality: Is It Safe to Drink? (2026 Report)

Rapid City, South Dakota tap water receives a grade of B (62/100), which is considered good. Out of 72 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 2 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.

Of the 72 contaminants tested in Rapid City's water supply, the most notable include PFOS, Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.

Yes, Rapid City has 40 EPA violation(s) on record, with the most recent in 2015. Violation types include TT, MCL, MR. 23 of these are health-based violations, which are the most serious category.

Based on EPA data, using a water filter in Rapid City is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.

Rapid City's drinking water is sourced from groundwater and supplied by COLONIAL PINE HILLS SANITARY DISTRIC and 3 other water system(s). The system serves approximately 85,817 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.

Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Rapid City's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.

Rapid City's water quality score of 62/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our South Dakota state page to see how all cities in the state compare.

If you have concerns about Rapid City's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (COLONIAL PINE HILLS SANITARY DISTRIC) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.