Public water system · MN1820020
ActiveOak Park Heights
At a glance
Oak Park Heights (PWSID MN1820020) is an active community water system in Washington County, Minnesota. It reports serving 4,776 people through 1,307 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in August 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
4,776
Service connections
1,307
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Oak Park Heights compare with other water systems in Washington County?
By EPA's size categories, Oak Park Heights is a medium system (3,301 to 10,000 people). Washington County has 192 active public water systems. Its population served is about 3.5 times the county average of 1,376 people per system, and accounts for 1.8% 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 Oak Park Heights is about 29% 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. 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 Oak Park Heights?
EPA lists Oak Park Heights 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 Oak Park Heights have drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in August 2014. The violations listed here began between February 1992 and August 2014. By type: 3 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 3 as archived and 1 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 |
|---|---|---|---|---|
| 2014-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1995-07-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1992-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1992-02-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
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.
Oak Park Heights: frequently asked questions
Who runs Oak Park Heights?
Oak Park Heights (PWSID MN1820020) is a community water system owned by a local government. It is regulated by the MN state drinking water program.
How many people does Oak Park Heights serve?
Oak Park Heights reports serving 4,776 people through 1,307 service connections in Washington County, Minnesota.
Where does Oak Park Heights 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 Oak Park Heights have any drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in August 2014. 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 Oak Park Heights' 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; 1 is health-based, and the most recent began in August 2014. For current results, consult the system's annual water quality report, EPA ECHO, or the MN state drinking water program.
Where can I find Oak Park Heights' water quality report?
As a community water system, Oak Park Heights 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 |
| Oakdale | Washington | 30,144 | Community | Groundwater |
| Stillwater | Washington | 19,462 | Community | Groundwater |
| Hugo | Washington | 12,047 | Community | Groundwater |
| Forest Lake | Washington | 11,800 | Community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Oak Park Heights, PWSID MN1820020, Minnesota”, https://aquacensus.com/water-systems/minnesota/oak-park-heights-mn1820020 (data as of October 1, 2026).