Public water system · IL1410550
ActiveStillman Valley
At a glance
Stillman Valley (PWSID IL1410550) is an active community water system in Ogle County, Illinois. It reports serving 1,200 people through 514 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 8 violations for this system; none is health-based, and the most recent began in March 2003.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,200
Service connections
514
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Stillman Valley compare with other water systems in Ogle County?
By EPA's size categories, Stillman Valley is a small system (501 to 3,300 people). Ogle County has 102 active public water systems. Its population served is about 191% above the county average of 412 people per system, and accounts for 2.9% of the 42,013 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 Stillman Valley 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 Stillman Valley?
EPA lists Stillman Valley 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. 15 of the 102 active systems in Ogle County (15%) are also owned by a local government.
Does Stillman Valley have drinking water violations?
EPA's records list 8 violations for this system; none is health-based, and the most recent began in March 2003. The violations listed here began between June 1977 and March 2003. By type: 8 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 4 as archived and 4 as resolved. 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. 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 |
|---|---|---|---|---|
| 2003-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2001-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2001-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2000-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 2000-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Resolved |
| 1999-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 1999-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Resolved |
| 1977-06-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 8 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.
Stillman Valley: frequently asked questions
Who runs Stillman Valley?
Stillman Valley (PWSID IL1410550) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Stillman Valley serve?
Stillman Valley reports serving 1,200 people through 514 service connections in Ogle County, Illinois.
Where does Stillman Valley 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 Stillman Valley have any drinking water violations?
EPA's records list 8 violations for this system; none is health-based, and the most recent began in March 2003. 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 Stillman Valley'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 8 violations for this system; none is health-based, and the most recent began in March 2003. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Stillman Valley's water quality report?
As a community water system, Stillman Valley 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 Ogle County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Rochelle | Ogle | 9,446 | Community | Groundwater |
| Byron | Ogle | 3,784 | Community | Groundwater |
| Oregon | Ogle | 3,449 | Community | Groundwater |
| Mount Morris | Ogle | 2,861 | Community | Groundwater |
| Polo | Ogle | 2,355 | Community | Groundwater |
| Davis Junction | Ogle | 2,344 | 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, “Stillman Valley, PWSID IL1410550, Illinois”, https://aquacensus.com/water-systems/illinois/stillman-valley-il1410550 (data as of October 1, 2026).