Public water system · IL1610650
ActiveRock Island
At a glance
Rock Island (PWSID IL1610650) is an active community water system in Rock Island County, Illinois. It reports serving 39,018 people through 15,072 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
39,018
Service connections
15,072
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Rock Island compare with other water systems in Rock Island County?
By EPA's size categories, Rock Island is a large system (10,001 to 100,000 people). Rock Island County has 102 active public water systems, and Rock Island is the 2nd-largest of them by population served. Its population served is about 25 times the county average of 1,592 people per system, and accounts for 24% 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 community water system reports serving 6,703 people, so Rock Island is about 5.8 times 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 89 Illinois systems (2.3%) list surface water as their primary source.
Who owns and regulates Rock Island?
EPA lists Rock Island 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. 16 of the 102 active systems in Rock Island County (16%) are also owned by a local government.
Does Rock Island have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2026. The violations listed here began between April 2020 and January 2026. By type: 11 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminants or rules involved are Haloacetic acids (HAA5), Consumer Confidence Rule, Lead and Copper Rule and Toxaphene. EPA lists 10 as resolved, 1 as archived and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2026-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Archived |
| 2025-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Unaddressed |
| 2023-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2023-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toxaphenecode 2020 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Oxamylcode 2036 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Endrincode 2005 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Polychlorinated biphenyls (PCBs), totalcode 2383 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Diquatcode 2032 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Di(2-ethylhexyl) adipatecode 2035 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Methoxychlorcode 2015 | No | Resolved |
| 2020-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Lindane (gamma-BHC)code 2010 | No | 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.
Rock Island: frequently asked questions
Who runs Rock Island?
Rock Island (PWSID IL1610650) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Rock Island serve?
Rock Island reports serving 39,018 people through 15,072 service connections in Rock Island County, Illinois.
Where does Rock Island get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Rock Island have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2026. 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 Rock Island'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, none is health-based, and the most recent began in January 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Rock Island's water quality report?
As a community water system, Rock Island 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 Rock Island County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Moline | Rock Island | 44,500 | 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 |
| Milan | Rock Island | 4,945 | 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, “Rock Island, PWSID IL1610650, Illinois”, https://aquacensus.com/water-systems/illinois/rock-island-il1610650 (data as of October 1, 2026).