Public water system · IL0110850

Active

Princeton

At a glance

Princeton (PWSID IL0110850) is an active community water system in Bureau County, Illinois. It reports serving 7,832 people through 3,810 service connections. 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; 4 are health-based, and the most recent began in July 2025.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

7,832

Service connections

3,810

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDIL0110850

System typeCommunity water system

Activity statusActive

Population served7,832

Service connections3,810

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyIL state drinking water program

City servedPrinceton

StateIllinois

ZIP—

CountyBureau County

How does Princeton compare with other water systems in Bureau County?

By EPA's size categories, Princeton is a medium system (3,301 to 10,000 people). Bureau County has 52 active public water systems, and Princeton is the largest of them by population served. Its population served is about 14 times the county average of 551 people per system, and accounts for 27% of the 28,670 people reported by systems filed under the county. Across Illinois, the 3,872 active systems average 3,204 people each. Nationally, the average active community water system reports serving 6,703 people, so Princeton is about 17% above 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. Illinois has 1,773 active community water systems, 46% of the state's 3,872 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,808 Illinois systems (73%) list groundwater as their primary source.

Who owns and regulates Princeton?

EPA lists Princeton as owned by a local government. The IL state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 22 of the 52 active systems in Bureau County (42%) are also owned by a local government.

Does Princeton have drinking water violations?

EPA's records list 6 violations for this system; 4 are health-based, and the most recent began in July 2025. The violations listed here began between June 1977 and July 2025. By type: 2 contaminant level above the legal limit, 1 reporting, 1 required treatment not met, 1 disinfectant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 5 as resolved and 1 as archived. 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. 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.

Began	Violation	Contaminant or rule	Health-based	Status
2025-07-02	ReportingNotification, Known or Potential LSL · code 4H	Lead and Copper Rule Revisionscode 5200	No	Resolved
2019-12-01	Required treatment not metPublic Education · code 65	Lead and Copper Rulecode 5000	Yes	Resolved
2019-10-01	Disinfectant level above the legal limitNon-Acute MRDL · code 11	Chlorinecode 0999	Yes	Resolved
2004-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2004-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1977-06-30	Monitoring and reportingMonitoring, Regular · code 03	Gross alpha (excluding radon and uranium)code 4000	No	Archived

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.

Princeton: frequently asked questions

Who runs Princeton?

Princeton (PWSID IL0110850) is a community water system owned by a local government. It is regulated by the IL state drinking water program.

How many people does Princeton serve?

Princeton reports serving 7,832 people through 3,810 service connections in Bureau County, Illinois.

Where does Princeton 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 Princeton have any drinking water violations?

EPA's records list 6 violations for this system; 4 are health-based, and the most recent began in July 2025. 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 Princeton'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; 4 are health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.

Where can I find Princeton's water quality report?

As a community water system, Princeton 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 Bureau County

Water system	County	Population served	Type	Source
Spring Valley	Bureau	5,582	Community	Groundwater
De Pue	Bureau	1,838	Community	Groundwater
Walnut	Bureau	1,311	Community	Groundwater
Ladd	Bureau	1,263	Community	Groundwater
The Great Sauk Trail - East	Bureau	900	Transient non-community	Groundwater
Wyanet	Bureau	886	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, “Princeton, PWSID IL0110850, Illinois”, https://aquacensus.com/water-systems/illinois/princeton-il0110850 (data as of October 1, 2026).