Public water system · ND3400856
ActiveSt Thomas City of
At a glance
City of St Thomas (PWSID ND3400856) is an active community water system in Pembina County, North Dakota. It reports serving 331 people through 230 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; none is health-based, and the most recent began in October 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
331
Service connections
230
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does City of St Thomas compare with other water systems in Pembina County?
By EPA's size categories, City of St Thomas is a very small system (500 people or fewer). Pembina County has 8 active public water systems. Its population served is about 67% below the county average of 991 people per system, and accounts for 4.2% of the 7,930 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 St Thomas 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 St Thomas?
EPA lists City of St Thomas 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. 7 of the 8 active systems in Pembina County (88%) are also owned by a local government.
Does City of St Thomas have drinking water violations?
EPA's records list 5 violations for this system; none is health-based, and the most recent began in October 2022. The violations listed here began between June 1996 and October 2022. By type: 3 monitoring and reporting, 1 public notice, recordkeeping or other and 1 monitoring. The contaminants or rules involved are Consumer Confidence Rule, Lead and Copper Rule, Revised Total Coliform Rule and Chloramine. EPA lists 4 as resolved and 1 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 |
|---|---|---|---|---|
| 2022-10-02 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2022-09-28 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2020-12-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2020-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chloraminecode 1006 | No | Resolved |
| 1996-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 5 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 St Thomas: frequently asked questions
Who runs City of St Thomas?
City of St Thomas (PWSID ND3400856) 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 St Thomas serve?
City of St Thomas reports serving 331 people through 230 service connections in Pembina County, North Dakota.
Where does City of St Thomas 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 St Thomas have any drinking water violations?
EPA's records list 5 violations for this system; none is health-based, and the most recent began in October 2022. 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 St Thomas' 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 5 violations for this system; none is health-based, and the most recent began in October 2022. 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 St Thomas' water quality report?
As a community water system, City of St Thomas 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 Pembina County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Northeast Rwd- North Valley Branch | Pembina | 3,422 | Community | Groundwater |
| Cavalier City of | Pembina | 1,302 | Community | Purchased groundwater |
| Walhalla City of | Pembina | 996 | Community | Purchased groundwater |
| Drayton City of | Pembina | 824 | Community | Purchased groundwater |
| Pembina City of | Pembina | 592 | Community | Purchased groundwater |
| Neche City of | Pembina | 371 | 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, “St Thomas City of, PWSID ND3400856, North Dakota”, https://aquacensus.com/water-systems/north-dakota/st-thomas-city-of-nd3400856 (data as of October 1, 2026).