RILEY COMMUNITY SCHOOL
PWS ID: IL3064774 · MARENGO, Illinois 60152
RILEY COMMUNITY SCHOOL serves 220 people in MARENGO, Illinois using Groundwater water sources. It has 87 recorded EPA violations, including 4 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: RILEY COMMUNITY SCHOOL
RILEY COMMUNITY SCHOOL is a local-owned non-transient non-community water system that delivers drinking water to 220 residents in MARENGO, Illinois (McHenry County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 87 total violations for this system , of which 4 (5%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 77 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 Lead and Copper Rule, recorded in 6 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. RILEY COMMUNITY SCHOOL's 87 violations sit above 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.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 1
- County
- McHenry
- School/Daycare
- Yes
- MCL Violations
- 0
- Monitoring Violations
- 77
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 6 | 2023 |
| Coliform (TCR) | MR | 5 | 1996 |
| LEAD AND COPPER RULE REVISIONS | TT | 4 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 4 | 2024 |
| Nitrate | MR | 3 | 2008 |
| 1,2,4-Trichlorobenzene | MR | 3 | 2024 |
| cis-1,2-Dichloroethylene | MR | 3 | 2024 |
| DICHLOROMETHANE | MR | 3 | 2024 |
| p-Dichlorobenzene | MR | 3 | 2024 |
| Vinyl chloride | MR | 3 | 2024 |
| 1,1-Dichloroethylene | MR | 3 | 2024 |
| trans-1,2-Dichloroethylene | MR | 3 | 2024 |
| 1,1,1-Trichloroethane | MR | 3 | 2024 |
| Carbon tetrachloride | MR | 3 | 2024 |
| 1,2-Dichloropropane | MR | 3 | 2024 |
| Trichloroethylene | MR | 3 | 2024 |
| Tetrachloroethylene | MR | 3 | 2024 |
| Benzene | MR | 3 | 2024 |
| Toluene | MR | 3 | 2024 |
| Ethylbenzene | MR | 3 | 2024 |
| Styrene | MR | 3 | 2024 |
| 1,2-Dichloroethane | MR | 3 | 2024 |
| CHLOROBENZENE | MR | 3 | 2024 |
| Xylenes, Total | MR | 3 | 2024 |
| o-Dichlorobenzene | MR | 3 | 2024 |
| 1,1,2-Trichloroethane | MR | 3 | 2024 |
| Public Notice | Other | 2 | 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 RILEY COMMUNITY SCHOOL.
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 IL3064774 on SDWISSource: EPA SDWIS Federal Reports Search
Illinois Drinking Water Authority
Illinois EPA — Bureau of Water is the primacy agency that licenses and inspects RILEY COMMUNITY SCHOOL under EPA-delegated authority.
Open IL regulator portalSource: 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 | 2 | SDWIS / IL3064774 / 7500 |
| 2024 | LEAD AND COPPER RULE REVISIONS | TT | 4 | SDWIS / IL3064774 / 5200 |
| 2024 | LEAD AND COPPER RULE REVISIONS | RPT | 4 | SDWIS / IL3064774 / 5200 |
| 2024 | 1,2,4-Trichlorobenzene | MR | 3 | SDWIS / IL3064774 / 2378 |
| 2024 | cis-1,2-Dichloroethylene | MR | 3 | SDWIS / IL3064774 / 2380 |
| 2024 | DICHLOROMETHANE | MR | 3 | SDWIS / IL3064774 / 2964 |
| 2024 | p-Dichlorobenzene | MR | 3 | SDWIS / IL3064774 / 2969 |
| 2024 | Vinyl chloride | MR | 3 | SDWIS / IL3064774 / 2976 |
| 2024 | 1,1-Dichloroethylene | MR | 3 | SDWIS / IL3064774 / 2977 |
| 2024 | trans-1,2-Dichloroethylene | MR | 3 | SDWIS / IL3064774 / 2979 |
| 2024 | 1,1,1-Trichloroethane | MR | 3 | SDWIS / IL3064774 / 2981 |
| 2024 | Carbon tetrachloride | MR | 3 | SDWIS / IL3064774 / 2982 |
| 2024 | 1,2-Dichloropropane | MR | 3 | SDWIS / IL3064774 / 2983 |
| 2024 | Trichloroethylene | MR | 3 | SDWIS / IL3064774 / 2984 |
| 2024 | Tetrachloroethylene | MR | 3 | SDWIS / IL3064774 / 2987 |
How RILEY COMMUNITY SCHOOL Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | RILEY COMMUNITY SCHOOL | Illinois avg | Federal benchmark |
|---|---|---|---|
| Total violations | 87 | 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 | 40.9% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 220 | 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 RILEY COMMUNITY SCHOOL water safe to drink? ▼
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Related Data for Illinois
Read our methodology — how this data is sourced, computed, and verified.