A88/100
Yountville Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 2,787 residents · California
What's In Yountville's Tap Water?
35
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.40 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: June 1, 2022 – June 30, 2022Rule: Total Coliform RuleEnforcement: Formal — state order issued
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
TOWN OF YOUNTVILLE
Population Served
2,787
Water Source
Purchased Surface Water
System ID
CA2810007
Frequently Asked Questions About Yountville Water
Is Yountville tap water safe to drink?
Yountville, California tap water receives a grade of A (88/100), which is considered excellent. Out of 35 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.
What contaminants are in Yountville's water?
Of the 35 contaminants tested in Yountville'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.
Does Yountville have any water quality violations?
Yes, Yountville has 4 EPA violation(s) on record, with the most recent in 2022. Violation types include MON, MR. None of these are classified as health-based violations.
Do I need a water filter in Yountville?
Based on EPA data, using a water filter in Yountville 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.
Where does Yountville's tap water come from?
Yountville's drinking water is sourced from purchased surface water and supplied by TOWN OF YOUNTVILLE. The system serves approximately 2,787 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Yountville's water tested?
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. Yountville'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.
How does Yountville's water compare to other cities in California?
Yountville's water quality score of 88/100 earns a grade of A, which is considered excellent. This places Yountville among the better-performing water systems in California. Visit our California state page to see how all cities in the state compare.
What should I do if I'm concerned about Yountville's water quality?
If you have concerns about Yountville'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 (TOWN OF YOUNTVILLE) 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.