Is Langdon, ND Tap Water Safe to Drink?
Graded A, with 3 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
91.6/100
waterverge.com Langdon, ND — Water Quality Report
Langdon's drinking water received a grade of A (91.6 out of 100), indicating excellent water quality. The city's 2 water systems serve approximately 4,328 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 18 violations on record, including 9 health-based violations. 3 remain unresolved.
What to know about Langdon's water
Langdon ranks #24 out of 103 cities in North Dakota for water quality, placing it above average in the state.
Langdon purchases its water from a regional wholesaler, meaning quality depends on both the supplier's treatment and the local distribution system's condition.
Water quality score
See methodology →Is Langdon, ND water safe to drink?
Langdon's drinking water has significant quality concerns based on EPA testing data. With a grade of A (91.6/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 4,328 residents using groundwater (wells).
Recent water quality updates for Langdon
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Langdon's water quality assessment. Grade: A (91.6/100).
Contaminants: Lead and Copper Rule.
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.
Contaminants: Lead and Copper Rule.
Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Langdon's water supply.
Well within EPA limits.
Violation history
Langdon's water system has 18 total violations on record, including 9 health-based violations. 3 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
Pembina County has experienced 10 federally declared disasters since 2010. 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 Tongue River.
Where does Langdon's water come from?
Langdon's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 4,328 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Tongue River (river).
What Langdon residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Langdon'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.
Langdon'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
Pembina County has experienced 10 federally declared disasters since 2010. 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 Langdon compares by contaminant
Explore where Langdon ranks among all North Dakota cities for specific contaminants.
Water source & infrastructure
Where Langdon's water comes from
Langdon 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 Langdon'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 private ownership and serves approximately 4,328 people through 2 water systems.
Water bodies near Langdon
Langdon is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Langdon
| System Name | PWSID | Population | Source |
|---|---|---|---|
| NORTHEAST RWD-LANGDON BRANCH | ND1001380 | 2,450 | GWP |
| LANGDON CITY OF | ND1000543 | 1,878 | GWP |
How Langdon compares
Full North Dakota rankings →Langdon's score of 91.6/100 is above the average of 82/100 among major North Dakota cities. It outscores 8 of 10 nearby cities.
Nearby cities
View North Dakota rankings →About Langdon, ND
Wikipedia →Cavalier is the largest city in Pembina County, North Dakota, United States. It is the county seat of Pembina County. The population was 1,246 at the 2020 census. Cavalier was founded in 1875 and became the county seat in 1911. Icelandic State Park is located 6 miles west of Cavalier, is also home to Lake Renwick.
Learn more about your water
Guides and resources related to Langdon's water quality findings.
Explore water quality across Cavalier
Frequently asked questions
Is Langdon, ND tap water safe to drink?
Langdon's water quality earned a grade of A (91.6/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #24 out of 103 cities tested in North Dakota.
What contaminants are in Langdon's water?
Lead was measured at 0.0 ppb (90th percentile). 18 violations are on record.
How is Langdon'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 Langdon?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Langdon's water come from?
Langdon's water is sourced from Purchased ground water. The city has 2 water systems serving approximately 4,328 residents.
What health violations has Langdon's water system had?
Langdon has 9 health-based violations on record. The most recent violation was recorded in September 2023. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 3 violations remain unresolved.
Is Langdon's groundwater at risk of contamination?
Langdon 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 18 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 Langdon's water compare to other cities?
Langdon ranks #24 out of 103 cities in North Dakota (better than 77% of state cities) and #1573 out of 15744 cities nationally (90th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.