Public water system · MN1170010
ActiveDelft
At a glance
Delft (PWSID MN1170010) is an active community water system in Cottonwood County, Minnesota. It reports serving 58 people through 29 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
58
Service connections
29
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Delft compare with other water systems in Cottonwood County?
By EPA's size categories, Delft is a very small system (500 people or fewer). Cottonwood County has 11 active public water systems. Its population served is well below the county average of 1,288 people per system, and accounts for 0.4% of the 14,164 people reported by systems filed under the county. Across Minnesota, the 6,465 active systems average 820 people each. Nationally, the average active community water system reports serving 6,703 people, so Delft 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. Minnesota has 987 active community water systems, 15% of the state's 6,465 active systems. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 89 Minnesota systems (1.4%) list purchased groundwater as their primary source.
Who owns and regulates Delft?
EPA lists Delft as owned by a local government. The MN state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 8 of the 11 active systems in Cottonwood County (73%) are also owned by a local government.
Does Delft have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 2025. The violations listed here began between July 2021 and October 2025. By type: 3 monitoring and reporting and 1 monitoring. The contaminants or rules involved are Chlorine, Revised Total Coliform Rule, Haloacetic acids (HAA5) and Total trihalomethanes (TTHM). EPA lists 3 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 |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Archived |
| 2025-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2021-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2021-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
All 4 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.
Delft: frequently asked questions
Who runs Delft?
Delft (PWSID MN1170010) is a community water system owned by a local government. It is regulated by the MN state drinking water program.
How many people does Delft serve?
Delft reports serving 58 people through 29 service connections in Cottonwood County, Minnesota.
Where does Delft 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 Delft have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 2025. 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 Delft'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 4 violations for this system; none is health-based, and the most recent began in October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MN state drinking water program.
Where can I find Delft's water quality report?
As a community water system, Delft 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 Cottonwood County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Red Rock Rural Water System | Cottonwood | 5,840 | Community | Groundwater |
| Windom | Cottonwood | 4,646 | Community | Groundwater |
| Mountain Lake | Cottonwood | 2,018 | Community | Groundwater |
| Westbrook | Cottonwood | 785 | Community | Groundwater |
| Jeffers | Cottonwood | 369 | Community | Purchased groundwater |
| Storden | Cottonwood | 215 | 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, “Delft, PWSID MN1170010, Minnesota”, https://aquacensus.com/water-systems/minnesota/delft-mn1170010 (data as of October 1, 2026).