B76/100
Rio Dell Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 3,300 residents · California
What's In Rio Dell's Tap Water?
32
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 3.40 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1996.
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
RIO DELL, CITY OF
Population Served
3,300
Water Source
Surface Water
System ID
CA1210012
Frequently Asked Questions About Rio Dell Water
Is Rio Dell tap water safe to drink?
Rio Dell, California tap water receives a grade of B (76/100), which is considered good. Out of 32 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 Rio Dell's water?
Of the 32 contaminants tested in Rio Dell'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 Rio Dell have any water quality violations?
Yes, Rio Dell has 4 EPA violation(s) on record, with the most recent in 1996. Violation types include MCL, MR. 3 of these are health-based violations, which are the most serious category.
Do I need a water filter in Rio Dell?
Based on EPA data, using a water filter in Rio Dell 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 Rio Dell's tap water come from?
Rio Dell's drinking water is sourced from surface water and supplied by RIO DELL, CITY OF. The system serves approximately 3,300 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Rio Dell'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. Rio Dell'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 Rio Dell's water compare to other cities in California?
Rio Dell's water quality score of 76/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our California state page to see how all cities in the state compare.
What should I do if I'm concerned about Rio Dell's water quality?
If you have concerns about Rio Dell'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 (RIO DELL, CITY OF) 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.