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Non-Transient Non-Community Water System · PWS IL3062620

St John Baptist

Woodstock, Illinois 60098 - drinking water served from groundwater sources to 150 people, tracked in EPA SDWIS and UCMR5.

150
People served
225
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 225 drinking-water violations at St John Baptist, 2% of them health-based - above the Illinois per-system average.

225
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
150
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: St John Baptist

St John Baptist is a private-owned non-transient non-community water system that delivers drinking water to 150 residents in Woodstock, Illinois (McHenry County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 225 total violations for this system , of which 4 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 220 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 1,2,4-Trichlorobenzene, 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, 123 of 487 UCMR5-tested systems have reported PFAS detections (25.3%).

St John Baptist's 225 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
150
Total Violations
225
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
1
County
McHenry
School/Daycare
Yes
MCL Violations
4
Monitoring Violations
220
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
1,2,4-Trichlorobenzene MR 8 2018
cis-1,2-Dichloroethylene MR 8 2018
Xylenes, Total MR 8 2018
DICHLOROMETHANE MR 8 2018
p-Dichlorobenzene MR 8 2018
Vinyl chloride MR 8 2018
1,1-Dichloroethylene MR 8 2018
trans-1,2-Dichloroethylene MR 8 2018
1,1,1-Trichloroethane MR 8 2018
Carbon tetrachloride MR 8 2018
Trichloroethylene MR 8 2018
1,1,2-Trichloroethane MR 8 2018
Tetrachloroethylene MR 8 2018
CHLOROBENZENE MR 8 2018
Toluene MR 8 2018
o-Dichlorobenzene MR 8 2018
1,2-Dichloroethane MR 8 2018
1,2-Dichloropropane MR 8 2018
Styrene MR 8 2018
Benzene MR 8 2018
Ethylbenzene MR 8 2018
Coliform (TCR) MCL 4 1992
Lead and Copper Rule MR 3 2023
Nitrate MR 3 2008
Cadmium MR 2 1996
CYANIDE MR 2 1996
Mercury MR 2 1996
Antimony, Total MR 2 1996
BHC-GAMMA MR 2 1996
Toxaphene MR 2 1996

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 John Baptist.

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 IL3062620 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 John Baptist 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 Public Notice Other 1 SDWIS / IL3062620 / 7500
2023 Lead and Copper Rule MR 3 SDWIS / IL3062620 / 5000
2018 1,2,4-Trichlorobenzene MR 8 SDWIS / IL3062620 / 2378
2018 cis-1,2-Dichloroethylene MR 8 SDWIS / IL3062620 / 2380
2018 Xylenes, Total MR 8 SDWIS / IL3062620 / 2955
2018 DICHLOROMETHANE MR 8 SDWIS / IL3062620 / 2964
2018 p-Dichlorobenzene MR 8 SDWIS / IL3062620 / 2969
2018 Vinyl chloride MR 8 SDWIS / IL3062620 / 2976
2018 1,1-Dichloroethylene MR 8 SDWIS / IL3062620 / 2977
2018 trans-1,2-Dichloroethylene MR 8 SDWIS / IL3062620 / 2979
2018 1,1,1-Trichloroethane MR 8 SDWIS / IL3062620 / 2981
2018 Carbon tetrachloride MR 8 SDWIS / IL3062620 / 2982
2018 Trichloroethylene MR 8 SDWIS / IL3062620 / 2984
2018 1,1,2-Trichloroethane MR 8 SDWIS / IL3062620 / 2985
2018 Tetrachloroethylene MR 8 SDWIS / IL3062620 / 2987

How St John Baptist Compares

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

Metric St John Baptist Illinois avg Federal benchmark
Total violations 225 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 10.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 25.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 150 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 John Baptist water safe to drink? ▼
St John Baptist (PWS ID: IL3062620) has 225 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 150 people using Groundwater sources.
How many people does St John Baptist serve? ▼
St John Baptist serves 150 people in Woodstock, Illinois. It is a Private-owned system using Groundwater water sources with 1 service connections.
What type of violations does St John Baptist have? ▼
St John Baptist has 225 total violations: 4 health-based violations (MCL exceedances or treatment failures), 220 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in St John Baptist water? ▼
No PFAS testing data is available for St John Baptist under the EPA's UCMR5 monitoring program.
What water source does St John Baptist use? ▼
St John Baptist uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.