Public water system · IL3110833
ActiveConstellation Energy Generation LLC
At a glance
Constellation Energy Generation LLC (PWSID IL3110833) is an active non-transient non-community water system in Rock Island County, Illinois. It reports serving 950 people through 3 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in January 2010.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
950
Service connections
3
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Constellation Energy Generation LLC compare with other water systems in Rock Island County?
By EPA's size categories, Constellation Energy Generation LLC is a small system (501 to 3,300 people). Rock Island County has 102 active public water systems. Its population served is about 40% below the county average of 1,592 people per system, and accounts for 0.6% of the 162,391 people reported by systems filed under the county. Across Illinois, the 3,872 active systems average 3,204 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Constellation Energy Generation LLC is about 121% above 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. Illinois has 396 active non-transient non-community water systems, 10% 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 Constellation Energy Generation LLC?
EPA lists Constellation Energy Generation LLC as privately owned. 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. 67 of the 102 active systems in Rock Island County (66%) are also privately owned.
Does Constellation Energy Generation LLC have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in January 2010. The violations listed here began between July 1990 and January 2010. By type: 2 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 2 as archived and 1 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 |
|---|---|---|---|---|
| 2010-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1990-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1990-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
All 3 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.
Constellation Energy Generation LLC: frequently asked questions
Who runs Constellation Energy Generation LLC?
Constellation Energy Generation LLC (PWSID IL3110833) is a non-transient non-community water system privately owned. It is regulated by the IL state drinking water program.
How many people does Constellation Energy Generation LLC serve?
Constellation Energy Generation LLC reports serving 950 people through 3 service connections in Rock Island County, Illinois.
Where does Constellation Energy Generation LLC 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 Constellation Energy Generation LLC have any drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in January 2010. 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 Constellation Energy Generation LLC'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 3 violations for this system; 1 is health-based, and the most recent began in January 2010. For current results, consult EPA ECHO, or the IL state drinking water program.
Where can I find Constellation Energy Generation LLC's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Constellation Energy Generation LLC 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 Rock Island County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Moline | Rock Island | 44,500 | Community | Surface water |
| Rock Island | Rock Island | 39,018 | Community | Surface water |
| East Moline | Rock Island | 21,374 | Community | Surface water |
| Rock Island Arsenal, Us Army | Rock Island | 7,800 | Community | Surface water |
| Silvis | Rock Island | 7,473 | Community | Purchased surface water |
| Niabi Zoo | Rock Island | 5,000 | 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, “Constellation Energy Generation LLC, PWSID IL3110833, Illinois”, https://aquacensus.com/water-systems/illinois/constellation-energy-generation-llc-il3110833 (data as of October 1, 2026).