Public water system · IL0730300

Active

Cambridge

At a glance

Cambridge (PWSID IL0730300) is an active community water system in Henry County, Illinois. It reports serving 2,086 people through 911 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in August 2016.

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

Population served

2,086

Service connections

911

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDIL0730300

System typeCommunity water system

Activity statusActive

Population served2,086

Service connections911

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyIL state drinking water program

City servedCambridge

StateIllinois

ZIP—

CountyHenry County

How does Cambridge compare with other water systems in Henry County?

By EPA's size categories, Cambridge is a small system (501 to 3,300 people). Henry County has 72 active public water systems, and Cambridge is the 6th-largest of them by population served. Its population served is about 3.5 times the county average of 598 people per system, and accounts for 4.8% of the 43,076 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 Cambridge is well 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. 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 Cambridge?

EPA lists Cambridge 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. 18 of the 72 active systems in Henry County (25%) are also owned by a local government.

Does Cambridge have drinking water violations?

Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in August 2016. The violations listed here began between April 1988 and August 2016. By type: 9 contaminant level above the legal limit, 2 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Combined Radium (-226 and -228) (7 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
2016-08-19	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2016-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2016-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2016-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2015-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2012-07-01	Monitoring and reportingMonitoring, Regular · code 03	Combined Uraniumcode 4006	No	Resolved
2001-01-01	Monitoring and reportingWater Quality Parameter M/R · code 53	Lead and Copper Rulecode 5000	No	Resolved
1995-11-09	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
1995-06-07	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Gross alpha (excluding radon and uranium)code 4000	Yes	Resolved
1992-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
1990-05-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Gross alpha (excluding radon and uranium)code 4000	Yes	Resolved
1988-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	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.

Cambridge: frequently asked questions

Who runs Cambridge?

Cambridge (PWSID IL0730300) is a community water system owned by a local government. It is regulated by the IL state drinking water program.

How many people does Cambridge serve?

Cambridge reports serving 2,086 people through 911 service connections in Henry County, Illinois.

Where does Cambridge 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 Cambridge have any drinking water violations?

Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in August 2016. 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 Cambridge'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. Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in August 2016. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.

Where can I find Cambridge's water quality report?

As a community water system, Cambridge 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 Henry County

Water system	County	Population served	Type	Source
Kewanee	Henry	12,509	Community	Groundwater
Geneseo	Henry	6,539	Community	Groundwater
Colona West	Henry	2,640	Community	Groundwater
Colona East	Henry	2,501	Community	Groundwater
Galva	Henry	2,449	Community	Groundwater
Orion	Henry	1,754	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, “Cambridge, PWSID IL0730300, Illinois”, https://aquacensus.com/water-systems/illinois/cambridge-il0730300 (data as of October 1, 2026).