Rock Rapids Tap Water Quality: Is It Safe to Drink? (2026 Report)

Rock Rapids, Iowa tap water receives a grade of A (81/100), which is considered excellent. Out of 32 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 32 contaminants tested in Rock Rapids's water supply, the most notable include Copper (90th percentile), 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, Rock Rapids has 23 EPA violation(s) on record, with the most recent in 2019. Violation types include MR, MCL. 4 of these are health-based violations, which are the most serious category.

Based on EPA data, using a water filter in Rock Rapids 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.

Rock Rapids's drinking water is sourced from groundwater and supplied by LYON-SIOUX RWS-DOON and 3 other water system(s). The system serves approximately 7,093 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. Rock Rapids'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.

Rock Rapids's water quality score of 81/100 earns a grade of A, which is considered excellent. This places Rock Rapids among the better-performing water systems in Iowa. Visit our Iowa state page to see how all cities in the state compare.

If you have concerns about Rock Rapids'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 (LYON-SIOUX RWS-DOON) 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.