Is Dunkerton, IA Tap Water Safe to Drink?
Graded A- — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
87.2/100
waterverge.com Dunkerton, IA — Water Quality Report
Dunkerton's drinking water received a grade of A- (87.2 out of 100), indicating good water quality. The city's 2 water systems serve approximately 1,080 residents using groundwater.
Lead levels were measured at 0.0 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 30 violations on record, including 6 health-based violations. 3 remain unresolved.
What to know about Dunkerton's water
Dunkerton ranks #303 out of 436 cities in Iowa for water quality, placing it below average in the state.
Dunkerton 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, Dunkerton may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Dunkerton, IA water safe to drink?
Dunkerton's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (87.2/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 1,080 residents using groundwater (wells).
Recent water quality updates for Dunkerton
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Dunkerton's water quality assessment. Grade: A- (87.2/100).
Contaminants: Nitrate.
Contaminants: Consumer Confidence Rule.
Contaminants: Revised Total Coliform Rule.
Federal disaster declaration (FEMA DR-4289). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3239). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Dunkerton's water supply.
Well within EPA limits.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Dunkerton's water system has 30 total violations on record, including 6 health-based violations. 3 remain unresolved. 2 violations were issued in the last 5 years.
Flood & environmental risk
Black Hawk County has experienced 10 federally declared disasters since 1965. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Little Wapsipinicon River Near Oran.
Where does Dunkerton's water come from?
Dunkerton's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 1,080 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Little Wapsipinicon River Near Oran (river).
What Dunkerton residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Dunkerton's water.
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.
Dunkerton's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Dunkerton
Industrial polluters nearby
Reported releases to surface water by facilities near Dunkerton, ranked by pounds discharged annually.
Total reported releases to surface water: 115 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
JOHN DEERE WATERLOO WORKS TCAO WATERLOO, IA50703 | Manganese | 115 | 6.6 mi |
POET BIOREFINING - FAIRBANK LLC FAIRBANK, IA50629 | — | — | 8.4 mi |
WATERLOO PROCESSING LLC WATERLOO, IA50703 | — | — | 6.0 mi |
TYSON FRESH MEATS INC WATERLOO IOWA WATERLOO, IA50703 | — | — | 6.6 mi |
A-LINE E.D.S. WATERLOO, IA50703 | — | — | 9.0 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Black Hawk County has experienced 10 federally declared disasters since 1965. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Dunkerton's water supply, we recommend the following filter types.
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. | 0.0 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 1.53 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level trend (90th percentile)
See how Dunkerton compares by contaminant
Explore where Dunkerton ranks among all Iowa cities for specific contaminants.
Water source & infrastructure
Where Dunkerton's water comes from
Dunkerton'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 1,080 people through 2 water systems.
Water bodies near Dunkerton
Dunkerton is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Dunkerton
| System Name | PWSID | Population | Source |
|---|---|---|---|
| DUNKERTON MUNI WATER SUPPLY | IA0717084 | 842 | GW |
| LENWOOD UTILITIES | IA0717353 | 238 | GW |
How Dunkerton compares
Full Iowa rankings →Dunkerton's score of 87.2/100 is above the average of 72/100 among major Iowa cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Iowa rankings →About Dunkerton, IA
Wikipedia →Dunkerton is a city in Black Hawk County, Iowa, United States. The population was 842 at the time of the 2020 census. It is part of the Waterloo–Cedar Falls Metropolitan Statistical Area.
Learn more about your water
Guides and resources related to Dunkerton's water quality findings.
Explore water quality across Black Hawk
Frequently asked questions
Is Dunkerton, IA tap water safe to drink?
Dunkerton's water quality earned a grade of A- (87.2/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #303 out of 436 cities tested in Iowa.
What contaminants are in Dunkerton's water?
Lead was measured at 0.0 ppb (90th percentile). 30 violations are on record.
How is Dunkerton'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 Dunkerton?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Dunkerton's water come from?
Dunkerton's water is sourced from Groundwater. The city has 2 water systems serving approximately 1,080 residents.
What health violations has Dunkerton's water system had?
Dunkerton has 6 health-based violations on record. The most recent violation was recorded in April 2022. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 3 violations remain unresolved.
Is Dunkerton's groundwater at risk of contamination?
Dunkerton 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 30 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 Dunkerton's water compare to other cities?
Dunkerton ranks #303 out of 436 cities in Iowa (better than 31% of state cities) and #4222 out of 15744 cities nationally (73th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.