Public water system · IL1815150
ActiveAlto Pass Water District
At a glance
Alto Pass Water District (PWSID IL1815150) is an active community water system in Union County, Illinois. It reports serving 1,015 people through 466 service connections. Its primary water source is purchased 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 September 2016.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,015
Service connections
466
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Alto Pass Water District compare with other water systems in Union County?
By EPA's size categories, Alto Pass Water District is a small system (501 to 3,300 people). Union County has 12 active public water systems, and Alto Pass Water District is the 5th-largest of them by population served. Its population served is about 11% below the county average of 1,139 people per system, and accounts for 7.4% of the 13,669 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 Alto Pass Water District 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. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 348 Illinois systems (9%) list purchased groundwater as their primary source.
Who owns and regulates Alto Pass Water District?
EPA lists Alto Pass Water District 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. 8 of the 12 active systems in Union County (67%) are also owned by a local government.
Does Alto Pass Water District have drinking water violations?
Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in September 2016. The violations listed here began between January 2011 and September 2016. By type: 9 contaminant level above the legal limit and 3 monitoring and reporting. The contaminant or rule involved most often is Haloacetic acids (HAA5) (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 |
|---|---|---|---|---|
| 2016-09-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2016-09-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2014-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2012-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2012-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2011-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2011-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2011-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2011-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2011-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2011-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2011-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | 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.
Alto Pass Water District: frequently asked questions
Who runs Alto Pass Water District?
Alto Pass Water District (PWSID IL1815150) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Alto Pass Water District serve?
Alto Pass Water District reports serving 1,015 people through 466 service connections in Union County, Illinois.
Where does Alto Pass Water District get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Alto Pass Water District 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 September 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 Alto Pass Water District'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 September 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 Alto Pass Water District's water quality report?
As a community water system, Alto Pass Water District 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 Union County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Anna | Union | 4,910 | Community | Purchased groundwater |
| Lick Creek PWD | Union | 2,365 | Community | Purchased surface water |
| Jonesboro | Union | 1,799 | Community | Purchased groundwater |
| Cobden | Union | 1,267 | Community | Groundwater |
| Shawnee Valley PWD | Union | 738 | Community | Purchased groundwater |
| Dongola | Union | 736 | Community | Purchased 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, “Alto Pass Water District, PWSID IL1815150, Illinois”, https://aquacensus.com/water-systems/illinois/alto-pass-water-district-il1815150 (data as of October 1, 2026).