Is Dubois, ID Tap Water Safe to Drink?
Graded A, with 2 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
90.8/100
waterverge.com Dubois, ID — Water Quality Report
Dubois's drinking water received a grade of A (90.8 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 511 residents using groundwater.
Lead levels were measured at 1.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 17 violations on record, including 3 health-based violations. 2 remain unresolved.
What to know about Dubois's water
Dubois ranks #21 out of 139 cities in Idaho for water quality, placing it above average in the state.
Dubois relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Dubois may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Dubois, ID water safe to drink?
Dubois's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (90.8/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 511 residents using groundwater (wells).
Recent water quality updates for Dubois
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Dubois's water quality assessment. Grade: A (90.8/100).
Contaminants: Public Notice.
1 health-based. Contaminants: Groundwater Rule.
Contaminants: Revised Total Coliform Rule.
Federal disaster declaration (FEMA DR-3244). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Dubois's water supply.
Well within EPA limits.
Violation history
Dubois's water system has 17 total violations on record, including 3 health-based violations. 2 remain unresolved. 2 violations were issued in the last 5 years.
Flood & environmental risk
Clark County has experienced 1 federally declared disaster since 2005. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Dubois's water come from?
Dubois's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 511 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Dubois residents can do
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Drought conditions
D2 — severe droughtClark County is currently in D2 (severe drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Clark County has experienced 1 federally declared disaster since 2005. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 1.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Dubois compares by contaminant
Explore where Dubois ranks among all Idaho cities for specific contaminants.
Water source & infrastructure
Where Dubois's water comes from
Dubois's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by local government ownership and serves approximately 511 people through 1 water system.
Water systems serving Dubois
| System Name | PWSID | Population | Source |
|---|---|---|---|
| DUBOIS CITY OF | ID7170003 | 511 | GW |
How Dubois compares
Full Idaho rankings →Dubois's score of 90.8/100 is above the average of 43/100 among major Idaho cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Idaho rankings →About Dubois, ID
Wikipedia →Dubois is a city in Clark County, Idaho, United States. The population was 511 at the 2020 census. The city is the county seat of Clark County.
Learn more about your water
Guides and resources related to Dubois's water quality findings.
Explore water quality across Clark
Frequently asked questions
Is Dubois, ID tap water safe to drink?
Dubois's water quality earned a grade of A (90.8/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #21 out of 139 cities tested in Idaho.
What contaminants are in Dubois's water?
Lead was measured at 1.0 ppb (90th percentile). 17 violations are on record.
How is Dubois's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Dubois?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Dubois's water come from?
Dubois's water is sourced from Groundwater. The city has 1 water system serving approximately 511 residents.
What health violations has Dubois's water system had?
Dubois has 3 health-based violations on record. The most recent violation was recorded in November 2022. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
Is Dubois's groundwater at risk of contamination?
Dubois uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 17 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Dubois's water compare to other cities?
Dubois ranks #21 out of 139 cities in Idaho (better than 85% of state cities) and #2057 out of 15744 cities nationally (87th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Dubois's small water system affect quality?
Dubois's system serves approximately 511 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 17 violations on record.