MyCleanWater

Rapid City, South Dakota Water Quality Report

Water quality data for 45 water systems serving 93,804 people.

50
Fair
out of 100

Water Source

45
Water Systems
94K
People Served
Surface water, Ground water
Water Source

Detected Contaminants

ContaminantDetected LevelEPA Limit (MCL)Health Guideline% of LimitStatus
lithium23.4 No federal limit10.0 ug/L(EPA/USGS HBSL)
234%
Above guideline
PFHxS0.006 0.010 ug/L0.001 ug/L(EWG)
58%
Within limit
PFOS0.006 0.004 ug/L0.300 ug/L(EWG)
143%
Above limit

Recommended Water Filters

Based on the contaminants detected in your water supply, these filtration systems are recommended:

Reverse Osmosis (RO)

Reverse osmosis systems remove up to 99% of PFAS compounds. Recommended for homes with detected PFAS.

Up to 99% PFAS removal

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Compliance & Violations

Active Violations (2)

12

Jul 7, 2025

critical

71

Jul 1, 2024

minor

Resolved Violations (498)

02

Jul 1, 2025 — Sep 30, 2025

critical

3A

Jul 1, 2025 — Jul 31, 2025

minor

12

Feb 1, 2025

critical

12

Feb 1, 2025

critical

12

Feb 1, 2025

critical

+ 493 more resolved violations

Frequently Asked Questions

Is Rapid City tap water safe to drink?

Rapid City's water has 1 contaminant detected above EPA limits. While the water is treated, residents may want to consider additional filtration.

What contaminants are in Rapid City tap water?

3 contaminants have been detected in Rapid City's water supply across 45 water systems. See the full contaminant table above for details.

How can I improve my water quality in Rapid City?

Install a water filter rated for the specific contaminants found in Rapid City's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.

Does Rapid City have any water quality violations?

Yes, Rapid City currently has 117 active violations. See the violations section above for details.