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Community Water System · PWS IL0995225

Ottawa Estates MHP (Formerly Dattis MHP)

Lake Forest, Illinois 60045 - drinking water served from groundwater sources to 70 people, tracked in EPA SDWIS and UCMR5.

70
People served
48
EPA violations
19
Health-based
Untested
UCMR5 result

The verdict

EPA records 48 drinking-water violations at Ottawa Estates MHP (Formerly Dattis MHP), 40% of them health-based - below the Illinois per-system average.

48
Total EPA violations on record
40%
Health-based (MCL / treatment failure)
70
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Ottawa Estates MHP (Formerly Dattis MHP)

Ottawa Estates MHP (Formerly Dattis MHP) is a private-owned community water system that delivers drinking water to 70 residents in Lake Forest, Illinois (LaSalle County) through 50 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 48 total violations for this system , of which 19 (40%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 22 monitoring and reporting violations are on file. The most recent violation on record dates to 2017.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 15 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%).

Ottawa Estates MHP (Formerly Dattis MHP)'s 48 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
70
Total Violations
48
Health-Based Violations
19
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
50
County
LaSalle
School/Daycare
No
MCL Violations
14
Monitoring Violations
22
Treatment Tech Violations
5

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 15 2012
Coliform (TCR) MCL 14 2008
Lead and Copper Rule TT 5 1998
Chlorine MR 4 2012
Lead and Copper Rule MR 3 2017
Public Notice Other 2 2008

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 Ottawa Estates MHP (Formerly Dattis MHP).

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 IL0995225 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 Ottawa Estates MHP (Formerly Dattis MHP) 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
2017 Lead and Copper Rule MR 3 SDWIS / IL0995225 / 5000
2012 Coliform (TCR) MR 15 SDWIS / IL0995225 / 3100
2012 Chlorine MR 4 SDWIS / IL0995225 / 0999
2008 Coliform (TCR) MCL 14 SDWIS / IL0995225 / 3100
2008 Public Notice Other 2 SDWIS / IL0995225 / 7500
1998 Lead and Copper Rule TT 5 SDWIS / IL0995225 / 5000

How Ottawa Estates MHP (Formerly Dattis MHP) Compares

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

Metric Ottawa Estates MHP (Formerly Dattis MHP) Illinois avg Federal benchmark
Total violations 48 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 19 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 70 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 Ottawa Estates MHP (Formerly Dattis MHP) water safe to drink? ▼
Ottawa Estates MHP (Formerly Dattis MHP) (PWS ID: IL0995225) has 48 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 70 people using Groundwater sources.
How many people does Ottawa Estates MHP (Formerly Dattis MHP) serve? ▼
Ottawa Estates MHP (Formerly Dattis MHP) serves 70 people in Lake Forest, Illinois. It is a Private-owned system using Groundwater water sources with 50 service connections.
What type of violations does Ottawa Estates MHP (Formerly Dattis MHP) have? ▼
Ottawa Estates MHP (Formerly Dattis MHP) has 48 total violations: 19 health-based violations (MCL exceedances or treatment failures), 22 monitoring/reporting violations, and 5 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Ottawa Estates MHP (Formerly Dattis MHP) water? ▼
No PFAS testing data is available for Ottawa Estates MHP (Formerly Dattis MHP) under the EPA's UCMR5 monitoring program.
What water source does Ottawa Estates MHP (Formerly Dattis MHP) use? ▼
Ottawa Estates MHP (Formerly Dattis MHP) uses Groundwater 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.