Is Mapleton, 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 ↓
89.7/100
waterverge.com Mapleton, ND — Water Quality Report
Mapleton's drinking water received a grade of A- (89.7 out of 100), indicating good water quality. The city's 1 water system serves approximately 1,320 residents using purchased ground water.
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 2 violations on record, including 0 health-based violations. 1 remains unresolved.
What to know about Mapleton's water
Mapleton ranks #37 out of 103 cities in North Dakota for water quality, placing it mid-range in the state.
Mapleton 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, Mapleton may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Mapleton, ND water safe to drink?
Mapleton's tap water meets most EPA standards but has areas that warrant attention. With a grade of A- (89.7/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 1,320 residents using groundwater (wells).
Recent water quality updates for Mapleton
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Mapleton's water quality assessment. Grade: A- (89.7/100).
Federal disaster declaration (FEMA DR-4553). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4444). Flood event — may have impacted local water infrastructure.
Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Mapleton's water supply.
Well within EPA limits.
Violation history
Mapleton's water system has 2 total violations on record, including 0 health-based violations. 1 remain unresolved.
Flood & environmental risk
Cass County has experienced 10 federally declared disasters since 2001. 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 Sheyenne R Ab Sheyenne R Diversion Nr Horace, Sheyenne River Diversion Nr Horace, Sheyenne River Diversion, Sheyenne River, Maple River Nr Mapleton.
Where does Mapleton's water come from?
Mapleton's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,320 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Sheyenne R Ab Sheyenne R Diversion Nr Horace (river), Sheyenne River Diversion Nr Horace (river), Sheyenne River Diversion (river), Sheyenne River (river), Maple River Nr Mapleton (river).
What Mapleton 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.
Mapleton'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 Mapleton
Industrial polluters nearby
Reported releases to surface water by facilities near Mapleton, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
THARALDSON ETHANOL PLANT I LLC CASSELTON, ND58012 | — | — | 10.0 mi |
CARGILL INC WEST FARGO, ND58078 | — | — | 7.4 mi |
TRUENORTH STEEL WEST FARGO, ND58078 | — | — | 7.6 mi |
FLINT HILLS RESOURCES PINE BEND LLC WEST FARGO WEST FARGO, ND58078 | — | — | 7.3 mi |
CATERPILLAR REMANUFACTURING DRIVETRAIN LLC WEST FARGO, ND58078 | — | — | 6.2 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Cass County has experienced 10 federally declared disasters since 2001. 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 Mapleton compares by contaminant
Explore where Mapleton ranks among all North Dakota cities for specific contaminants.
Water source & infrastructure
Where Mapleton's water comes from
Mapleton 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 Mapleton'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 1,320 people through 1 water system.
Water bodies near Mapleton
Mapleton is located near 5 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Mapleton
| System Name | PWSID | Population | Source |
|---|---|---|---|
| MAPLETON CITY OF | ND0900613 | 1,320 | GWP |
How Mapleton compares
Full North Dakota rankings →Mapleton's score of 89.7/100 is above the average of 82/100 among major North Dakota cities. It outscores 6 of 10 nearby cities.
Nearby cities
View North Dakota rankings →About Mapleton, ND
Wikipedia →Mapleton is a city in Cass County, North Dakota, United States. It sits on the banks of the Maple River. The population was 1,320 at the 2020 census. Mapleton serves as a bedroom community of the Fargo-Moorhead metropolitan area. The core cities are ten miles to the east of Mapleton.
Learn more about your water
Guides and resources related to Mapleton's water quality findings.
Explore water quality across Cass
Frequently asked questions
Is Mapleton, ND tap water safe to drink?
Mapleton's water quality earned a grade of A- (89.7/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #37 out of 103 cities tested in North Dakota.
What contaminants are in Mapleton's water?
Lead was measured at 0.0 ppb (90th percentile). 2 violations are on record.
How is Mapleton'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 Mapleton?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Mapleton's water come from?
Mapleton's water is sourced from Purchased ground water. The city has 1 water system serving approximately 1,320 residents.
Is Mapleton's groundwater at risk of contamination?
Mapleton 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 2 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 Mapleton's water compare to other cities?
Mapleton ranks #37 out of 103 cities in North Dakota (better than 64% of state cities) and #2668 out of 15744 cities nationally (83th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Mapleton's small water system affect quality?
Mapleton's system serves approximately 1,320 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 2 violations on record.