Public water system · ND4900622
ActiveMayville City of
At a glance
City of Mayville (PWSID ND4900622) is an active community water system in Traill County, North Dakota. It reports serving 1,858 people through 681 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2007.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,858
Service connections
681
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does City of Mayville compare with other water systems in Traill County?
By EPA's size categories, City of Mayville is a small system (501 to 3,300 people). Traill County has 5 active public water systems, and City of Mayville is the 2nd-largest of them by population served. Its population served is about 22% above the county average of 1,529 people per system, and accounts for 24% of the 7,644 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 Mayville 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 Mayville?
EPA lists City of Mayville 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 Traill County (80%) are also owned by a local government.
Does City of Mayville have drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2007. The violations listed here began between September 1993 and July 2007. By type: 5 monitoring and reporting, 1 contaminant level above the legal limit and 1 required treatment not met. The contaminant or rule involved most often is Surface Water Treatment Rule (2 of them). EPA lists 4 as archived and 3 as resolved. 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. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2007-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 2005-03-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Archived |
| 2004-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2004-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2003-03-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 1994-01-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1993-09-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Archived |
All 7 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 Mayville: frequently asked questions
Who runs City of Mayville?
City of Mayville (PWSID ND4900622) 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 Mayville serve?
City of Mayville reports serving 1,858 people through 681 service connections in Traill County, North Dakota.
Where does City of Mayville 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 Mayville have any drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2007. 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 Mayville'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 7 violations for this system; 2 are health-based, and the most recent began in July 2007. 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 Mayville's water quality report?
As a community water system, City of Mayville 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 Traill County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| East Central Regional Wd-Traill | Traill | 2,800 | Community | Groundwater |
| Hillsboro City of | Traill | 1,603 | Community | Groundwater |
| Hatton City of | Traill | 777 | Community | Purchased groundwater |
| Portland City of | Traill | 606 | 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, “Mayville City of, PWSID ND4900622, North Dakota”, https://aquacensus.com/water-systems/north-dakota/mayville-city-of-nd4900622 (data as of October 1, 2026).