C58/100
Dunsmuir Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 1,707 residents · California
What's In Dunsmuir's Tap Water?
2
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.62 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
2
Violations (last 5yr)
2
Unresolved
1
Health-Related
TIER 3Unresolved
Reporting violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 2Unresolved
Treatment technique violation
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
DUNSMUIR, CITY OF
Population Served
1,707
Water Source
Groundwater
System ID
CA4710002
Frequently Asked Questions About Dunsmuir Water
Is Dunsmuir tap water safe to drink?
Dunsmuir, California tap water receives a grade of C (58/100), which is considered fair. 1 contaminant(s) exceed EPA maximum contaminant levels and 10 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Dunsmuir's water?
Of the 2 contaminants tested in Dunsmuir'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 Dunsmuir have any water quality violations?
Yes, Dunsmuir has 10 EPA violation(s) on record, with the most recent in 2024. Violation types include RPT, TT, MCL. 6 of these are health-based violations, which are the most serious category.
Do I need a water filter in Dunsmuir?
Based on EPA data, using a water filter in Dunsmuir 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 Dunsmuir's tap water come from?
Dunsmuir's drinking water is sourced from groundwater and supplied by DUNSMUIR, CITY OF. The system serves approximately 1,707 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Dunsmuir'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. Dunsmuir'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 Dunsmuir's water compare to other cities in California?
Dunsmuir's water quality score of 58/100 earns a grade of C, which is considered fair. This is a below-average score that indicates room for improvement. Visit our California state page to see how all cities in the state compare.
What should I do if I'm concerned about Dunsmuir's water quality?
If you have concerns about Dunsmuir'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 (DUNSMUIR, 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.