F0/100
Dubois Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 1,870 residents · Wyoming
What's In Dubois'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) | 1.40 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 2Resolved
Consumer confidence report — content deficiency
When: July 1, 2024Rule: Ground Water RuleEnforcement: Formal — state order issued
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: April 1, 2022 – April 30, 2022Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
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
DUBOIS, TOWN OF
Population Served
1,870
Water Source
Groundwater
System ID
WY5600177
Frequently Asked Questions About Dubois Water
Is Dubois tap water safe to drink?
Dubois, Wyoming tap water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA maximum contaminant levels and 133 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Dubois's water?
Of the 2 contaminants tested in Dubois'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 Dubois have any water quality violations?
Yes, Dubois has 133 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, MON, MR. 2 of these are health-based violations, which are the most serious category.
Do I need a water filter in Dubois?
Based on EPA data, using a water filter in Dubois 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 Dubois's tap water come from?
Dubois's drinking water is sourced from groundwater and supplied by DUBOIS, TOWN OF. The system serves approximately 1,870 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Dubois'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. Dubois'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 Dubois's water compare to other cities in Wyoming?
Dubois's water quality score of 0/100 earns a grade of F, which is considered failing. This is a concerning score that suggests significant water quality issues. Visit our Wyoming state page to see how all cities in the state compare.
What should I do if I'm concerned about Dubois's water quality?
If you have concerns about Dubois'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 (DUBOIS, TOWN 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.