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Community Water System · PWS IL1631200

St Libory

Swansea, Illinois 62226 - drinking water served from groundwater sources to 628 people, tracked in EPA SDWIS and UCMR5.

628
People served
66
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 66 drinking-water violations at St Libory - below the Illinois per-system average.

66
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
628
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: St Libory

St Libory is a local-owned community water system that delivers drinking water to 628 residents in Swansea, Illinois (St. Clair County) through 238 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 66 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 62 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 7 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Illinois, EPA tracks 5,117 public water systems serving 12,576,876 people, with 355,322 cumulative violations and 52,932 health-based violations on record. About 81% of systems in the state carry at least one violation, and state-wide the average per system is 69.4 violations. Statewide, 199 of 487 UCMR5-tested systems have reported PFAS detections (40.9%).

St Libory's 66 violations sit below the Illinois average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
628
Total Violations
66
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
238
County
St. Clair
School/Daycare
No
MCL Violations
0
Monitoring Violations
62
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 7 2024
Coliform (TCR) MR 6 2006
Arsenic MR 4 2002
Barium MR 4 2002
CYANIDE MR 4 2002
Mercury MR 4 2002
Nickel MR 4 2002
Antimony, Total MR 4 2002
Beryllium, Total MR 4 2002
Thallium, Total MR 4 2002
Selenium MR 4 2002
Consumer Confidence Rule Other 4 2009
Chromium MR 4 2002
Cadmium MR 4 2002
Fluoride MR 4 2002
Gross Alpha, Excl. Radon and U MR 1 1977

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for St Libory.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID IL1631200 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Illinois Drinking Water Authority

Illinois EPA, Bureau of Water is the primacy agency that licenses and inspects St Libory under EPA-delegated authority.

Open IL regulator portal

Source: Illinois EPA, Bureau of Water

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Lead and Copper Rule MR 7 SDWIS / IL1631200 / 5000
2009 Consumer Confidence Rule Other 4 SDWIS / IL1631200 / 7000
2006 Coliform (TCR) MR 6 SDWIS / IL1631200 / 3100
2002 Arsenic MR 4 SDWIS / IL1631200 / 1005
2002 Barium MR 4 SDWIS / IL1631200 / 1010
2002 CYANIDE MR 4 SDWIS / IL1631200 / 1024
2002 Mercury MR 4 SDWIS / IL1631200 / 1035
2002 Nickel MR 4 SDWIS / IL1631200 / 1036
2002 Antimony, Total MR 4 SDWIS / IL1631200 / 1074
2002 Beryllium, Total MR 4 SDWIS / IL1631200 / 1075
2002 Thallium, Total MR 4 SDWIS / IL1631200 / 1085
2002 Selenium MR 4 SDWIS / IL1631200 / 1045
2002 Chromium MR 4 SDWIS / IL1631200 / 1020
2002 Cadmium MR 4 SDWIS / IL1631200 / 1015
2002 Fluoride MR 4 SDWIS / IL1631200 / 1025

How St Libory Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric St Libory Illinois avg Federal benchmark
Total violations 66 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 10.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 40.9% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 628 2,458 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 5,117 regulated public water systems in Illinois.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is St Libory water safe to drink? ▼
St Libory (PWS ID: IL1631200) has 66 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 628 people using Groundwater sources.
How many people does St Libory serve? ▼
St Libory serves 628 people in Swansea, Illinois. It is a Local-owned system using Groundwater water sources with 238 service connections.
What type of violations does St Libory have? ▼
St Libory has 66 total violations: 0 health-based violations (MCL exceedances or treatment failures), 62 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in St Libory water? ▼
No PFAS testing data is available for St Libory under the EPA's UCMR5 monitoring program.
What water source does St Libory use? ▼
St Libory uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.