No open health-based violations on EPA record in the last 10 years.
Serves about 920 people (620 connections) with surface water bought from Elgin.
From EPA's record for IL0894400. PurityMap is independent of Willow Lake Estates MHP.
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1 health-based violation in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2024 | Lead and copper rule revisions | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from March 2024 to January 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorohexanoic acid (PFHxA) | 3.8 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluorobutanoic acid (PFBA) | 5.4 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluoropentanoic acid (PFPeA) | 5.3 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-03-04 to 2024-12-04 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-03-04 to 2025-01-06 | UCMR5 Analytical Results: WILLOW LAKE ESTATES MHP (IL0894400) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →Willow Lake Estates MHP's phone number on EPA record is 847-742-3620. Its mailing address is 161 W River Road, ELGIN, IL 60123.
According to EPA's record, Willow Lake Estates MHP uses surface water bought from Elgin.
EPA's record shows 1 health-based violation for Willow Lake Estates MHP in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. EPA also lists 14 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Willow Lake Estates MHP's latest lead and copper round, which ended in December 2026. The federal action level is 15 µg/L.
PurityMap has no verified website for Willow Lake Estates MHP. Its phone number on EPA record is 847-742-3620. Its mailing address on EPA record is 161 W River Road, ELGIN, IL 60123. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.