Public water system · MN1820016
ActiveOakdale
At a glance
Oakdale (PWSID MN1820016) is an active community water system in Washington County, Minnesota. It reports serving 30,144 people through 9,442 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
30,144
Service connections
9,442
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Oakdale compare with other water systems in Washington County?
By EPA's size categories, Oakdale is a large system (10,001 to 100,000 people). Washington County has 192 active public water systems, and Oakdale is the 3rd-largest of them by population served. Its population served is about 22 times the county average of 1,376 people per system, and accounts for 11% of the 264,205 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 Oakdale is about 4.5 times 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,261 Minnesota systems (97%) list groundwater as their primary source.
Who owns and regulates Oakdale?
EPA lists Oakdale 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. 40 of the 192 active systems in Washington County (21%) are also owned by a local government.
Does Oakdale have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2019. By type: 1 monitoring and reporting. The contaminant or rule involved is Lead and Copper Rule. EPA lists 1 as resolved. 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 |
|---|---|---|---|---|
| 2019-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
The one violation in EPA's records.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.
Oakdale: frequently asked questions
Who runs Oakdale?
Oakdale (PWSID MN1820016) is a community water system owned by a local government. It is regulated by the MN state drinking water program.
How many people does Oakdale serve?
Oakdale reports serving 30,144 people through 9,442 service connections in Washington County, Minnesota.
Where does Oakdale get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Oakdale have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2019. 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 Oakdale'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 one violation for this system; it is not health-based, and the most recent began in October 2019. For current results, consult the system's annual water quality report, EPA ECHO, or the MN state drinking water program.
Where can I find Oakdale's water quality report?
As a community water system, Oakdale 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 Washington County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Woodbury | Washington | 82,643 | Community | Groundwater |
| Cottage Grove | Washington | 42,760 | Community | Groundwater |
| Stillwater | Washington | 19,462 | Community | Groundwater |
| Hugo | Washington | 12,047 | Community | Groundwater |
| Forest Lake | Washington | 11,800 | Community | Groundwater |
| Lake Elmo | Washington | 10,978 | Community | 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, “Oakdale, PWSID MN1820016, Minnesota”, https://aquacensus.com/water-systems/minnesota/oakdale-mn1820016 (data as of October 1, 2026).