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GREENWOOD SCHOOL

PWS ID: IL3001883 · WOODSTOCK, Illinois 60098

GREENWOOD SCHOOL serves 400 people in WOODSTOCK, Illinois using Groundwater water sources. It has 66 recorded EPA violations, including 18 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: GREENWOOD SCHOOL

GREENWOOD SCHOOL is a local-owned non-transient non-community water system that delivers drinking water to 400 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 66 total violations for this system , of which 18 (27%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 48 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 Arsenic, recorded in 18 violations (MCL, health-based). 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. GREENWOOD SCHOOL's 66 violations sit below the Illinois average. Statewide, 199 of 487 UCMR5-tested systems have reported PFAS detections (40.9%). 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
400
Total Violations
66
Health-Based Violations
18
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
1
County
McHenry
School/Daycare
Yes
MCL Violations
18
Monitoring Violations
48
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 18 2019
Lead and Copper Rule MR 5 2024
cis-1,2-Dichloroethylene MR 2 2020
Xylenes, Total MR 2 2020
DICHLOROMETHANE MR 2 2020
o-Dichlorobenzene MR 2 2020
p-Dichlorobenzene MR 2 2020
trans-1,2-Dichloroethylene MR 2 2020
1,2-Dichloroethane MR 2 2020
1,1,2-Trichloroethane MR 2 2020
CHLOROBENZENE MR 2 2020
Benzene MR 2 2020
Styrene MR 2 2020
1,1-Dichloroethylene MR 2 2020
Trichloroethylene MR 2 2020
Tetrachloroethylene MR 2 2020
1,1,1-Trichloroethane MR 2 2020
1,2,4-Trichlorobenzene MR 2 2020
Ethylbenzene MR 2 2020
1,2-Dichloropropane MR 2 2020
Toluene MR 2 2020
Vinyl chloride MR 2 2020
Carbon tetrachloride MR 2 2020
Arsenic MR 1 2019

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 GREENWOOD SCHOOL.

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 IL3001883 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 GREENWOOD SCHOOL 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 5 SDWIS / IL3001883 / 5000
2020 cis-1,2-Dichloroethylene MR 2 SDWIS / IL3001883 / 2380
2020 Xylenes, Total MR 2 SDWIS / IL3001883 / 2955
2020 DICHLOROMETHANE MR 2 SDWIS / IL3001883 / 2964
2020 o-Dichlorobenzene MR 2 SDWIS / IL3001883 / 2968
2020 p-Dichlorobenzene MR 2 SDWIS / IL3001883 / 2969
2020 trans-1,2-Dichloroethylene MR 2 SDWIS / IL3001883 / 2979
2020 1,2-Dichloroethane MR 2 SDWIS / IL3001883 / 2980
2020 1,1,2-Trichloroethane MR 2 SDWIS / IL3001883 / 2985
2020 CHLOROBENZENE MR 2 SDWIS / IL3001883 / 2989
2020 Benzene MR 2 SDWIS / IL3001883 / 2990
2020 Styrene MR 2 SDWIS / IL3001883 / 2996
2020 1,1-Dichloroethylene MR 2 SDWIS / IL3001883 / 2977
2020 Trichloroethylene MR 2 SDWIS / IL3001883 / 2984
2020 Tetrachloroethylene MR 2 SDWIS / IL3001883 / 2987

How GREENWOOD SCHOOL Compares

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

Metric GREENWOOD SCHOOL Illinois avg Federal benchmark
Total violations 66 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 400 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is GREENWOOD SCHOOL water safe to drink? ▼
GREENWOOD SCHOOL (PWS ID: IL3001883) has 66 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 400 people using Groundwater sources.
How many people does GREENWOOD SCHOOL serve? ▼
GREENWOOD SCHOOL serves 400 people in WOODSTOCK, Illinois. It is a Local-owned system using Groundwater water sources with 1 service connections.
What type of violations does GREENWOOD SCHOOL have? ▼
GREENWOOD SCHOOL has 66 total violations: 18 health-based violations (MCL exceedances or treatment failures), 48 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in GREENWOOD SCHOOL water? ▼
No PFAS testing data is available for GREENWOOD SCHOOL under the EPA's UCMR5 monitoring program.
What water source does GREENWOOD SCHOOL use? ▼
GREENWOOD SCHOOL 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.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

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