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Community Water System · PWS IL1190950

St Jacob

St. Jacob, Illinois 62281 - drinking water served from surface water sources to 1,835 people, tracked in EPA SDWIS and UCMR5.

1,835
People served
73
EPA violations
18
Health-based
Untested
UCMR5 result

The verdict

EPA records 73 drinking-water violations at St Jacob, 25% of them health-based - above the Illinois per-system average.

73
Total EPA violations on record
25%
Health-based (MCL / treatment failure)
1,835
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: St Jacob

St Jacob is a local-owned community water system that delivers drinking water to 1,835 residents in St. Jacob, Illinois (Madison County) through 738 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 73 total violations for this system , of which 18 (25%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 38 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Total Haloacetic Acids (HAA5), recorded in 8 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 Jacob's 73 violations sit above 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
1,835
Total Violations
73
Health-Based Violations
18
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
738
County
Madison
School/Daycare
No
MCL Violations
12
Monitoring Violations
38
Treatment Tech Violations
6

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Total Haloacetic Acids (HAA5) MR 8 2024
Combined Radium (-226 and -228) MCL 6 2005
TTHM MCL 6 2019
Coliform (TCR) MR 4 2009
Long Term 2 Enhanced Surface Water Treatment Rule TT 4 2014
Chlorine MR 4 2009
Consumer Confidence Rule Other 4 2025
p-Dichlorobenzene MR 3 1991
1,2-Dichloroethane MR 3 1991
Carbon tetrachloride MR 3 1991
Trichloroethylene MR 3 1991
1,1,1-Trichloroethane MR 3 1991
Benzene MR 3 1991
1,1-Dichloroethylene MR 3 1991
LEAD AND COPPER RULE REVISIONS TT 2 2024
LEAD AND COPPER RULE REVISIONS RPT 2 2025
Gross Alpha, Excl. Radon and U MR 1 1977
Public Notice Other 1 2025

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 Jacob.

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 IL1190950 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 Jacob 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
2025 Consumer Confidence Rule Other 4 SDWIS / IL1190950 / 7000
2025 LEAD AND COPPER RULE REVISIONS RPT 2 SDWIS / IL1190950 / 5200
2025 Public Notice Other 1 SDWIS / IL1190950 / 7500
2024 Total Haloacetic Acids (HAA5) MR 8 SDWIS / IL1190950 / 2456
2024 LEAD AND COPPER RULE REVISIONS TT 2 SDWIS / IL1190950 / 5200
2019 TTHM MCL 6 SDWIS / IL1190950 / 2950
2014 Long Term 2 Enhanced Surface Water Treatment Rule TT 4 SDWIS / IL1190950 / 0800
2009 Coliform (TCR) MR 4 SDWIS / IL1190950 / 3100
2009 Chlorine MR 4 SDWIS / IL1190950 / 0999
2005 Combined Radium (-226 and -228) MCL 6 SDWIS / IL1190950 / 4010
1991 p-Dichlorobenzene MR 3 SDWIS / IL1190950 / 2969
1991 1,2-Dichloroethane MR 3 SDWIS / IL1190950 / 2980
1991 Carbon tetrachloride MR 3 SDWIS / IL1190950 / 2982
1991 Trichloroethylene MR 3 SDWIS / IL1190950 / 2984
1991 1,1,1-Trichloroethane MR 3 SDWIS / IL1190950 / 2981

How St Jacob Compares

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

Metric St Jacob Illinois avg Federal benchmark
Total violations 73 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 18 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 1,835 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 Jacob water safe to drink? ▼
St Jacob (PWS ID: IL1190950) has 73 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,835 people using Surface Water sources.
How many people does St Jacob serve? ▼
St Jacob serves 1,835 people in St. Jacob, Illinois. It is a Local-owned system using Surface Water water sources with 738 service connections.
What type of violations does St Jacob have? ▼
St Jacob has 73 total violations: 18 health-based violations (MCL exceedances or treatment failures), 38 monitoring/reporting violations, and 6 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in St Jacob water? ▼
No PFAS testing data is available for St Jacob under the EPA's UCMR5 monitoring program.
What water source does St Jacob use? ▼
St Jacob uses Surface Water 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.