Public water system · WI8160201
ActiveNorthwestern High School
At a glance
Northwestern High School (PWSID WI8160201) is an active non-transient non-community water system in Douglas County, Wisconsin. It reports serving 448 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; none is health-based, and the most recent began in July 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
448
Service connections
1
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Northwestern High School compare with other water systems in Douglas County?
By EPA's size categories, Northwestern High School is a very small system (500 people or fewer). Douglas County has 188 active public water systems, and Northwestern High School is the 3rd-largest of them by population served. Its population served is about 143% above the county average of 184 people per system, and accounts for 1.3% of the 34,606 people reported by systems filed under the county. Across Wisconsin, the 11,056 active systems average 469 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Northwestern High School is roughly in line with that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Wisconsin has 891 active non-transient non-community water systems, 8.1% 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 Northwestern High School?
EPA lists Northwestern High School as owned by a local government. 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. 24 of the 188 active systems in Douglas County (13%) are also owned by a local government.
Does Northwestern High School have drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in July 2014. The violations listed here began between July 1993 and July 2014. By type: 5 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 6 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 |
|---|---|---|---|---|
| 2014-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2007-07-01 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2007-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1993-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1993-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
All 6 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.
Northwestern High School: frequently asked questions
Who runs Northwestern High School?
Northwestern High School (PWSID WI8160201) is a non-transient non-community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Northwestern High School serve?
Northwestern High School reports serving 448 people through 1 service connection in Douglas County, Wisconsin.
Where does Northwestern High School 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 Northwestern High School have any drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in July 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 Northwestern High School'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 6 violations for this system; none is health-based, and the most recent began in July 2014. For current results, consult EPA ECHO, or the WI state drinking water program.
Where can I find Northwestern High School's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Northwestern High School is a non-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 Douglas County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Superior Water Light & Power Company | Douglas | 26,084 | Community | Surface water |
| Northwestern Elementary and Middle School | Douglas | 890 | Non-transient non-community | Groundwater |
| Solon Springs School | Douglas | 375 | Non-transient non-community | Groundwater |
| Four Corners Elementary School | Douglas | 300 | Non-transient non-community | Groundwater |
| Parkland Town Hall | Douglas | 230 | Transient non-community | Groundwater |
| Bridges Bar | Douglas | 200 | 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, “Northwestern High School, PWSID WI8160201, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/northwestern-high-school-wi8160201 (data as of October 1, 2026).