Cu
1.1× the limitCopper
1.4mg/L
Each block = 1.3 mg/L federal action level
EPA SDWIS (Lead & Copper Rule) · sampled 2025Evidence
Lake in the Hills serves 28,661 people from groundwater. 32 results are on record. Copper (90th percentile) is above its federal limit; lithium sits above a screening level.
The bar is drawn in blocks of the 1.3 mg/L federal action level, so the length shows how far above it the result sits.
1.4mg/L
Each block = 1.3 mg/L federal action level
9,448service lines inventoried
From the utility's inventory reported to EPA (2026Q2). Look up your address with the utility.
0health-based violations in the last 10 years
From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit.
No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.
A federal limit (an MCL or action level) is an enforceable legal cap; a health goal is often stricter. Meeting the limit is a compliance fact, not a health clearance, and PurityMap publishes no overall compliance verdict.
The records describe the system. A certified lab test shows what reaches your glass.
Copper (90th percentile) 1.4 mg/L, above the 1.3 mg/L federal action level; Lithium 10.8 µg/L, above the 10.0 µg/L EPA health reference level
Understand water treatment technologies →
Understand:General guide: Copper (90th percentile)
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
Silver Lake Research
Lead, bacteria, nitrate, copper, iron, chlorine, hardness and pH
What it can't tell you: Each test gives a yes/no or a rough range, not a lab number, and it cannot detect PFAS or arsenic.
LAKE IN THE HILLS (PWS ID IL1110400) is a public water system serving 28,661 people in Lake in the Hills, Illinois.
LAKE IN THE HILLS is on record as drawing from groundwater. The source shapes which contaminants matter most for this system.
PurityMap's record for LAKE IN THE HILLS holds 32 findings: 2 above a reference and 30 not detected, from 32 evidence records. Every finding links to its source; a substance that was never monitored is shown as pending, not as a pass.
PurityMap does not issue a safety verdict. It publishes LAKE IN THE HILLS's measured results against each contaminant's benchmark so you can read them in context. Safety depends on the specific finding, your plumbing, and how the water reaches your tap.
The latest published record for LAKE IN THE HILLS is dated 2026-10-15. Utilities report on regulatory cycles, so results reflect the monitoring period rather than a live reading.
No. It is assessed at the water-system level from LAKE IN THE HILLS's own monitoring. It does not cover the service line to your building or the plumbing inside it, which can add lead and other metals after the water leaves the system. A tap test is the way to know what reaches your glass.
Lithium and Copper (90th percentile) were detected in this record. Each finding shows its measured value, its reference and its source on this page.
Follow Lake in the Hills
One email when a new sampling round is published, a result moves above or below its reference, or the system's score changes.
Follow this water →As listed for this system in EPA's records. Your water bill names your supplier.
| Substance | Result | Reference | Sampled | Status | Evidence |
|---|---|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | 2024-10-15 to 2025-04-09 | Not detected | — |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit) | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | 2024-10-15 to 2025-04-09 | Not detected | View evidence |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | 2024-10-15 to 2025-04-09 | Not detected | View evidence |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | 2024-10-15 to 2025-04-09 | Not detected | View evidence |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | 2024-10-15 to 2025-04-09 | Not detected | — |
| Lithium | 10.8 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit) | 2024-10-15 to 2025-04-09 | Above guideline | View evidence |
| Lead (90th percentile) | Non-Detect (ND) | 15 µg/L federal action level | 2025–2025 monitoring period | Not detected | View evidence |
| Copper (90th percentile) | 1.4 mg/L | 1.3 mg/L federal action level | 2025–2025 monitoring period | Above guideline | View evidence |
UCMR5 Analytical Results
UCMR5 Analytical Results: LAKE IN THE HILLS (IL1110400)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: LAKE IN THE HILLS (IL1110400)
US EPA SDWIS
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
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.
When your results arrive, read them here → · Compare every kit we list
Each card names which of this system’s findings its current certification covers, and which it doesn’t.
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No product in our catalogue has verified certification for these concerns yet.