Public water system · WI8020384
ActiveHighbridge Oasis
At a glance
Highbridge Oasis (PWSID WI8020384) is an active transient non-community water system in Ashland County, Wisconsin. It reports serving 25 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2002.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
25
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Highbridge Oasis compare with other water systems in Ashland County?
By EPA's size categories, Highbridge Oasis is a very small system (500 people or fewer). Ashland County has 82 active public water systems. Its population served is well below the county average of 151 people per system, and accounts for 0.2% of the 12,416 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 Highbridge Oasis is well 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 Highbridge Oasis?
EPA lists Highbridge 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. 56 of the 82 active systems in Ashland County (68%) are also privately owned.
Does Highbridge Oasis have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2002. The violations listed here began between January 1995 and January 2002. By type: 12 monitoring and reporting. The contaminant or rule involved most often is Nitrate (6 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2002-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2001-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2000-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2000-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1998-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1998-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1997-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1997-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1995-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1995-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitritecode 1041 | No | Resolved |
The 12 most recent 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.
Highbridge Oasis: frequently asked questions
Who runs Highbridge Oasis?
Highbridge Oasis (PWSID WI8020384) is a transient non-community water system privately owned. It is regulated by the WI state drinking water program.
How many people does Highbridge Oasis serve?
Highbridge Oasis reports serving 25 people through 1 service connection in Ashland County, Wisconsin.
Where does Highbridge 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 Highbridge Oasis have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2002. 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 Highbridge 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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2002. For current results, consult EPA ECHO, or the WI state drinking water program.
Where can I find Highbridge Oasis' water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Highbridge 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 Ashland County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Ashland Water Utility | Ashland | 8,000 | Community | Surface water |
| Glidden Sanitary District | Ashland | 750 | Community | Groundwater |
| Mellen Water Utility | Ashland | 731 | Community | Groundwater |
| Butternut Waterworks | Ashland | 283 | Community | Groundwater |
| Marengo Valley School | Ashland | 220 | Non-transient non-community | Groundwater |
| Hartzell Subdivision - Abbey Lane | Ashland | 115 | Transient non-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, “Highbridge Oasis, PWSID WI8020384, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/highbridge-oasis-wi8020384 (data as of October 1, 2026).