Is Mayville, 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 ↓
94.2/100
waterverge.com Mayville, ND — Water Quality Report
Mayville's drinking water received a grade of A (94.2 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 1,858 residents using purchased ground water.
Lead levels were measured at 2.7 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 8 violations on record, including 2 health-based violations. 1 remains unresolved.
What to know about Mayville's water
Mayville ranks #7 out of 103 cities in North Dakota for water quality, placing it one of the best in the state.
Mayville purchases its water from a regional wholesaler, meaning quality depends on both the supplier's treatment and the local distribution system's condition.
As a small community water system, Mayville may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Mayville, ND water safe to drink?
Mayville's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (94.2/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 1,858 residents using groundwater (wells).
Recent water quality updates for Mayville
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Mayville's water quality assessment. Grade: A (94.2/100).
Federal disaster declaration (FEMA DR-4553). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4475). Flood event — may have impacted local water infrastructure.
1 health-based. Contaminants: Coliform (TCR).
Contaminants: Interim Enhanced Surface Water Treatment Rule.
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Key contaminant findings
Based on the most recent EPA sampling data for Mayville's water supply.
Well within EPA limits.
Violation history
Mayville's water system has 8 total violations on record, including 2 health-based violations. 1 remain unresolved.
Flood & environmental risk
Traill County has experienced 10 federally declared disasters 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. Local water sources include Goose River.
Where does Mayville's water come from?
Mayville's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,858 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Goose River (river).
What Mayville 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.
Mayville'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
Flood & disaster history
Traill County has experienced 10 federally declared disasters 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. | 2.7 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Mayville compares by contaminant
Explore where Mayville ranks among all North Dakota cities for specific contaminants.
Water source & infrastructure
Where Mayville's water comes from
Mayville purchases its water supply from a regional wholesale provider rather than treating raw water directly.
Water quality depends on both the wholesaler's treatment standards and the condition of Mayville's local distribution pipes and storage facilities.
Purchased water systems are common in suburban areas and smaller communities that lack the infrastructure for independent treatment.
The system is operated by local government ownership and serves approximately 1,858 people through 1 water system.
Water bodies near Mayville
Mayville is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Mayville
| System Name | PWSID | Population | Source |
|---|---|---|---|
| MAYVILLE CITY OF | ND4900622 | 1,858 | GWP |
How Mayville compares
Full North Dakota rankings →Mayville's score of 94.2/100 is above the average of 82/100 among major North Dakota cities. It outscores 10 of 10 nearby cities.
Nearby cities
View North Dakota rankings →About Mayville, ND
Learn more about your water
Guides and resources related to Mayville's water quality findings.
Explore water quality across Traill
Frequently asked questions
Is Mayville, ND tap water safe to drink?
Mayville's water quality earned a grade of A (94.2/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #7 out of 103 cities tested in North Dakota.
What contaminants are in Mayville's water?
Lead was measured at 2.7 ppb (90th percentile). 8 violations are on record.
How is Mayville'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 Mayville?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Mayville's water come from?
Mayville's water is sourced from Purchased ground water. The city has 1 water system serving approximately 1,858 residents.
What health violations has Mayville's water system had?
Mayville has 2 health-based violations on record. The most recent violation was recorded in July 2007. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 1 violation remains unresolved.
Is Mayville's groundwater at risk of contamination?
Mayville 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 8 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 Mayville's water compare to other cities?
Mayville ranks #7 out of 103 cities in North Dakota (better than 93% of state cities) and #582 out of 15744 cities nationally (96th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Mayville's small water system affect quality?
Mayville's system serves approximately 1,858 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 8 violations on record.