Community Water System · PWS IL0894400
Willow Lake Estates MHP
Operator location Elgin, Illinois - smaller served population (≤ 999) at 920 people served; 41 SDWIS violations on record from surface water sources.
- 920
- People served (this PWS)
- 41
- EPA violations (this PWS)
- 3
- Health-based (this PWS)
- 3 PFAS
- UCMR5 (this PWS)
Willow Lake Estates MHP standing, mid SDWIS violation third
920 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 7% is middle-third health share (≤ 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #20,723 of 29,740 among systems serving 500+.
The verdict
Willow Lake Estates MHP lands in the middle third by violation volume (41), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (920; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 7% (middle-third health share (≤ 23%)). UCMR5 detected 3 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #20,723 of 29,740
- Population · /systems
- #925 of 1,310
- Population · IL
- 41
- Total EPA violations on record
- 7%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
3 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 620
- County
- Kane
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 30
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MR | 12 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 12 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 5 | 2025 |
| Revised Total Coliform Rule | MON | 3 | 2024 |
| Chloramine | MR | 3 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 3 | 2024 |
| Public Notice | Other | 2 | 2025 |
| Consumer Confidence Rule | Other | 1 | 2025 |
Violation Count vs. the National Corpus
Willow Lake Estates MHP has 41 recorded EPA violations, 51% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 48% carry more. 7% of this system's own violations are health-based (3 of 41), and it ranks #20,723 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
41 Around the middle fewer violations than 48% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 8 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFBS | 6/12/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 6/12/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 6/12/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 6/12/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 6/12/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/12/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/12/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 6/12/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 6/12/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 6/12/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 6/12/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFNA | 6/12/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 6/12/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 6/12/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| 6:2 FTS | 6/12/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 6/12/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 6/12/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 6/12/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 4:2 FTS | 6/12/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 6/12/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 6/12/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 6/12/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 6/12/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 6/12/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 6/12/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 6/12/2024 | 3.30 ppt | 3.00 ppt | Detected |
| PFMPA | 6/12/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 6/12/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NFDHA | 6/12/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFTA | 3/4/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHxA | 3/4/2024 | 3.20 ppt | 3.00 ppt | Detected |
| HFPO-DA | 3/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 3/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 3/4/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 9Cl-PF3ONS | 3/4/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 3/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 3/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeA | 3/4/2024 | 3.60 ppt | 3.00 ppt | Detected |
| PFDoA | 3/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 3/4/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFBS | 3/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 3/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 3/4/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 3/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 3/4/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 3/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 3/4/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| NFDHA | 3/4/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFMBA | 3/4/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 3/4/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
Population served record for Willow Lake Estates MHP
EPA SDWIS lists 920 people served and 620 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Illinois EPA, Bureau of Water
Nationwide peers
41 violations · 920 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Willow Lake Estates MHP
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Illinois compares on the same EPA violation measures. Illinois systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.