Is Gwinner, ND Tap Water Safe to Drink?
Graded A-, with 1 unresolved violation on record. See what was cited — and what it means for your tap. What to do next ↓
86.7/100
waterverge.com Gwinner, ND — Water Quality Report
Gwinner's drinking water received a grade of A- (86.7 out of 100), indicating good water quality. The city's 1 water system serves approximately 753 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 1 violation on record, including 0 health-based violations. 1 remains unresolved.
What to know about Gwinner's water
Gwinner ranks #57 out of 103 cities in North Dakota for water quality, placing it below average in the state.
Gwinner 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, Gwinner may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Gwinner, ND water safe to drink?
Gwinner's tap water meets most EPA standards but has areas that warrant attention. With a grade of A- (86.7/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 753 residents using groundwater (wells).
Recent water quality updates for Gwinner
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Gwinner's water quality assessment. Grade: A- (86.7/100).
Federal disaster declaration (FEMA DR-4717). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4553). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Gwinner's water supply.
Well within EPA limits.
Violation history
Gwinner's water system has 1 total violation on record, including 0 health-based violations. 1 remain unresolved.
Flood & environmental risk
Sargent County has experienced 10 federally declared disasters since 1998. 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 Gwinner's water come from?
Gwinner's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 753 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Gwinner 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.
Gwinner'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 Gwinner
Industrial polluters nearby
Reported releases to surface water by facilities near Gwinner, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
BOBCAT CO (MELROE) GWINNER, ND58040 | — | — | 0.4 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Sargent County has experienced 10 federally declared disasters since 1998. 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. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Gwinner compares by contaminant
Explore where Gwinner ranks among all North Dakota cities for specific contaminants.
Water source & infrastructure
Where Gwinner's water comes from
Gwinner'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 753 people through 1 water system.
Water systems serving Gwinner
| System Name | PWSID | Population | Source |
|---|---|---|---|
| GWINNER CITY OF | ND4100428 | 753 | GW |
How Gwinner compares
Full North Dakota rankings →Gwinner's score of 86.7/100 is on par with the average of 82/100 among major North Dakota cities. It outscores 6 of 10 nearby cities.
Nearby cities
View North Dakota rankings →About Gwinner, ND
Wikipedia →Gwinner is a city in Sargent County, North Dakota, United States. The population was 924 at the 2020 census. Gwinner was founded in 1900.
Learn more about your water
Guides and resources related to Gwinner's water quality findings.
Explore water quality across Sargent
Frequently asked questions
Is Gwinner, ND tap water safe to drink?
Gwinner's water quality earned a grade of A- (86.7/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #57 out of 103 cities tested in North Dakota.
What contaminants are in Gwinner's water?
Lead was measured at 0.0 ppb (90th percentile). 1 violation is on record.
How is Gwinner'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 Gwinner?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Gwinner's water come from?
Gwinner's water is sourced from Groundwater. The city has 1 water system serving approximately 753 residents.
Is Gwinner's groundwater at risk of contamination?
Gwinner 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 1 violation 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 Gwinner's water compare to other cities?
Gwinner ranks #57 out of 103 cities in North Dakota (better than 45% of state cities) and #4558 out of 15744 cities nationally (71th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Gwinner's small water system affect quality?
Gwinner's system serves approximately 753 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 1 violation on record.