Santa Rosa Tap Water Quality: Is It Safe to Drink? (2026 Report)

Santa Rosa, California tap water receives a grade of A (93/100), which is considered excellent. Out of 74 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 1 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 74 contaminants tested in Santa Rosa's water supply, the most notable include Copper (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.

Yes, Santa Rosa has 9 EPA violation(s) on record, with the most recent in 2022. Violation types include MR, Other. None of these are classified as health-based violations.

Based on EPA data, using a water filter in Santa Rosa 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.

Santa Rosa's drinking water is sourced from purchased groundwater and supplied by PENNGROVE WATER COMPANY (PUC) and 3 other water system(s). The system serves approximately 179,432 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. Santa Rosa'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.

Santa Rosa's water quality score of 93/100 earns a grade of A, which is considered excellent. This places Santa Rosa among the better-performing water systems in California. Visit our California state page to see how all cities in the state compare.

If you have concerns about Santa Rosa'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 (PENNGROVE WATER COMPANY (PUC)) 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.