Public water system · WI1140218
ActiveRubicon Oasis
At a glance
Rubicon Oasis (PWSID WI1140218) is an active transient non-community water system in Dodge County, Wisconsin. It reports serving 81 people through 2 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 2 violations for this system; none is health-based, and the most recent began in January 1999.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
81
Service connections
2
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Rubicon Oasis compare with other water systems in Dodge County?
By EPA's size categories, Rubicon Oasis is a very small system (500 people or fewer). Dodge County has 180 active public water systems. Its population served is well below the county average of 408 people per system, and accounts for 0.1% of the 73,453 people reported by systems filed under the county. Across Wisconsin, the 11,056 active systems average 469 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Rubicon Oasis is about 44% below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Wisconsin has 9,112 active transient non-community water systems, 82% of the state's 11,056 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 10,978 Wisconsin systems (99%) list groundwater as their primary source.
Who owns and regulates Rubicon Oasis?
EPA lists Rubicon Oasis as privately owned. The WI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 134 of the 180 active systems in Dodge County (74%) are also privately owned.
Does Rubicon Oasis have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in January 1999. The violations listed here began between January 1999 and January 1999. By type: 2 monitoring and reporting. The contaminants or rules involved are Nitrate and Total coliform bacteria (TCR). EPA lists 2 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 |
|---|---|---|---|---|
| 1999-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1999-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 2 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.
Rubicon Oasis: frequently asked questions
Who runs Rubicon Oasis?
Rubicon Oasis (PWSID WI1140218) is a transient non-community water system privately owned. It is regulated by the WI state drinking water program.
How many people does Rubicon Oasis serve?
Rubicon Oasis reports serving 81 people through 2 service connections in Dodge County, Wisconsin.
Where does Rubicon Oasis 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 Rubicon Oasis have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in January 1999. 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 Rubicon Oasis' 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 2 violations for this system; none is health-based, and the most recent began in January 1999. For current results, consult EPA ECHO, or the WI state drinking water program.
Where can I find Rubicon Oasis' water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Rubicon Oasis is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Dodge County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Beaver Dam Water Utility | Dodge | 16,200 | Community | Groundwater |
| Waupun Utilities | Dodge | 8,056 | Community | Groundwater |
| Mayville Waterworks | Dodge | 5,112 | Community | Groundwater |
| Waupun Correctional Inst | Dodge | 3,706 | Community | Groundwater |
| Horicon Waterworks | Dodge | 3,682 | Community | Groundwater |
| Lomira Waterworks | Dodge | 2,701 | 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, “Rubicon Oasis, PWSID WI1140218, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/rubicon-oasis-wi1140218 (data as of October 1, 2026).