Public water system · ND1000543

Active

Langdon City of

At a glance

City of Langdon (PWSID ND1000543) is an active community water system in Cavalier County, North Dakota. It reports serving 1,878 people through 980 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; 8 are health-based, and the most recent began in November 2012.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

1,878

Service connections

980

Primary source

GWP

Purchased groundwater

System type

CWS

Community water system

System record

PWSIDND1000543

System typeCommunity water system

Activity statusActive

Population served1,878

Service connections980

Primary water sourcePurchased groundwater

Owner typeLocal government

Primacy agencyND state drinking water program

City servedLangdon

StateNorth Dakota

ZIP—

CountyCavalier County

How does City of Langdon compare with other water systems in Cavalier County?

By EPA's size categories, City of Langdon is a small system (501 to 3,300 people). Cavalier County has 5 active public water systems, and City of Langdon is the 2nd-largest of them by population served. Its population served is about twice the county average of 914 people per system, and accounts for 41% of the 4,570 people reported by systems filed under the county. Across North Dakota, the 403 active systems average 1,864 people each. Nationally, the average active community water system reports serving 6,703 people, so City of Langdon is well below that figure.

What does “community water system” mean?

A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. North Dakota has 317 active community water systems, 79% of the state's 403 active systems. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 114 North Dakota systems (28%) list purchased groundwater as their primary source.

Who owns and regulates City of Langdon?

EPA lists City of Langdon as owned by a local government. The ND state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 4 of the 5 active systems in Cavalier County (80%) are also owned by a local government.

Does City of Langdon have drinking water violations?

EPA's records list 10 violations for this system; 8 are health-based, and the most recent began in November 2012. The violations listed here began between January 2004 and November 2012. By type: 5 contaminant level above the legal limit, 3 required treatment not met and 2 monitoring and reporting. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (3 of them). EPA lists 6 as resolved and 4 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.

Began	Violation	Contaminant or rule	Health-based	Status
2012-11-26	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2005-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2005-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2005-02-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Archived
2005-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2005-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2004-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2004-03-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Archived
2004-02-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Archived
2004-01-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Archived

All 10 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

City of Langdon: frequently asked questions

Who runs City of Langdon?

City of Langdon (PWSID ND1000543) is a community water system owned by a local government. It is regulated by the ND state drinking water program.

How many people does City of Langdon serve?

City of Langdon reports serving 1,878 people through 980 service connections in Cavalier County, North Dakota.

Where does City of Langdon get its water?

EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.

Does City of Langdon have any drinking water violations?

EPA's records list 10 violations for this system; 8 are health-based, and the most recent began in November 2012. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is City of Langdon's water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 10 violations for this system; 8 are health-based, and the most recent began in November 2012. For current results, consult the system's annual water quality report, EPA ECHO, or the ND state drinking water program.

Where can I find City of Langdon's water quality report?

As a community water system, City of Langdon must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.

Other water systems in Cavalier County

Water system	County	Population served	Type	Source
Northeast Rwd-Langdon Branch	Cavalier	2,450	Community	Purchased groundwater
Osnabrock City of	Cavalier	134	Community	Purchased groundwater
Milton City of	Cavalier	58	Community	Purchased groundwater
Nekoma City of	Cavalier	50	Community	Purchased groundwater

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About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Langdon City of, PWSID ND1000543, North Dakota”, https://aquacensus.com/water-systems/north-dakota/langdon-city-of-nd1000543 (data as of October 1, 2026).