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Non-Transient Non-Community Water System · PWS IL3086868

Diamond Lake School

Mundelein, Illinois 60060 - drinking water served from groundwater sources to 350 people, tracked in EPA SDWIS and UCMR5.

350
People served
54
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 54 drinking-water violations at Diamond Lake School, 7% of them health-based - below the Illinois per-system average.

54
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
350
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Diamond Lake School

Diamond Lake School is a local-owned non-transient non-community water system that delivers drinking water to 350 residents in Mundelein, Illinois (Lake County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 54 total violations for this system , of which 4 (7%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 46 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 4 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%).

Diamond Lake School's 54 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
350
Total Violations
54
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
1
County
Lake
School/Daycare
Yes
MCL Violations
0
Monitoring Violations
46
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 4 2024
LEAD AND COPPER RULE REVISIONS TT 4 2024
LEAD AND COPPER RULE REVISIONS RPT 4 2024
trans-1,2-Dichloroethylene MR 2 1996
1,1,2-Trichloroethane MR 2 1996
Tetrachloroethylene MR 2 1996
Toluene MR 2 1996
Styrene MR 2 1996
Vinyl chloride MR 2 1996
Xylenes, Total MR 2 1996
1,2,4-Trichlorobenzene MR 2 1996
Ethylbenzene MR 2 1996
Carbon tetrachloride MR 2 1996
1,2-Dichloroethane MR 2 1996
p-Dichlorobenzene MR 2 1996
1,2-Dichloropropane MR 2 1996
o-Dichlorobenzene MR 2 1996
CHLOROBENZENE MR 2 1996
1,1,1-Trichloroethane MR 2 1996
DICHLOROMETHANE MR 2 1996
1,1-Dichloroethylene MR 2 1996
Benzene MR 2 1996
cis-1,2-Dichloroethylene MR 2 1996
Trichloroethylene 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 Diamond Lake 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 IL3086868 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 Diamond Lake 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 4 SDWIS / IL3086868 / 5000
2024 LEAD AND COPPER RULE REVISIONS TT 4 SDWIS / IL3086868 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 4 SDWIS / IL3086868 / 5200
1996 trans-1,2-Dichloroethylene MR 2 SDWIS / IL3086868 / 2979
1996 1,1,2-Trichloroethane MR 2 SDWIS / IL3086868 / 2985
1996 Tetrachloroethylene MR 2 SDWIS / IL3086868 / 2987
1996 Toluene MR 2 SDWIS / IL3086868 / 2991
1996 Styrene MR 2 SDWIS / IL3086868 / 2996
1996 Vinyl chloride MR 2 SDWIS / IL3086868 / 2976
1996 Xylenes, Total MR 2 SDWIS / IL3086868 / 2955
1996 1,2,4-Trichlorobenzene MR 2 SDWIS / IL3086868 / 2378
1996 Ethylbenzene MR 2 SDWIS / IL3086868 / 2992
1996 Carbon tetrachloride MR 2 SDWIS / IL3086868 / 2982
1996 1,2-Dichloroethane MR 2 SDWIS / IL3086868 / 2980
1996 p-Dichlorobenzene MR 2 SDWIS / IL3086868 / 2969

How Diamond Lake School Compares

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

Metric Diamond Lake School Illinois avg Federal benchmark
Total violations 54 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 350 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 Diamond Lake School water safe to drink? ▼
Diamond Lake School (PWS ID: IL3086868) has 54 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 350 people using Groundwater sources.
How many people does Diamond Lake School serve? ▼
Diamond Lake School serves 350 people in Mundelein, Illinois. It is a Local-owned system using Groundwater water sources with 1 service connections.
What type of violations does Diamond Lake School have? ▼
Diamond Lake School has 54 total violations: 4 health-based violations (MCL exceedances or treatment failures), 46 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Diamond Lake School water? ▼
No PFAS testing data is available for Diamond Lake School under the EPA's UCMR5 monitoring program.
What water source does Diamond Lake School use? ▼
Diamond Lake 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.
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.