Cu
1.1× the limitCopper
1.4mg/L
Each block = 1.3 mg/L federal action level
EPA SDWIS (Lead & Copper Rule) · sampled 2017Evidence
South Lyon, City of serves 11,055 people from groundwater. 32 results are on record. Copper (90th percentile) is above its federal limit; everything else measured is within its reference or not detected.
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
3,730service 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.
A tap test can confirm levels at your home before you choose treatment.
HFPO-DA (GenX) 5.4 ng/L, below the 10 ng/L limit
Copper (90th percentile) 1.4 mg/L, above the 1.3 mg/L federal action level
Understand water treatment technologies →
Understand:General guide: Copper (90th percentile)PFAS in South Lyon
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
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.
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.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.
No product in our catalogue has verified certification for these concerns yet.
Lead service lines
SOUTH LYON, CITY OF reported 2 lead and 38 galvanized service lines to replace in EPA’s inventory (2026Q2). Many utilities replace these lines for free or share the cost. Ask SOUTH LYON, CITY OF whether your home’s line is on its list before you pay anyone.
Local help
Call to be connected with a local plumbing provider about lead service lines, repiping or fixture replacement.
SOUTH LYON, CITY OF (PWS ID MI0006110) is a public water system serving 11,055 people in South Lyon, Michigan.
SOUTH LYON, CITY OF is on record as drawing from groundwater. The source shapes which contaminants matter most for this system.
PurityMap's record for SOUTH LYON, CITY OF holds 32 findings: 1 above a reference, 2 detected within the reference and 29 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 SOUTH LYON, CITY OF'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 SOUTH LYON, CITY OF 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 SOUTH LYON, CITY OF'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.
Copper (90th percentile), Lithium and Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) were detected in this record. Each finding shows its measured value, its reference and its source on this page.
Start with what the record shows: the PFAS findings above list each measured value against its reference. This record cannot show your home's plumbing, so a tap test tells you what reaches your glass. If you decide to treat your water, look for a filter whose certification covers the specific PFAS compounds in your record; the section "Certified for a concern found here" lists only products with a current certification record for these concerns.
Follow South Lyon, City of
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 | 2024-08-29 to 2025-02-24 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | 5.4 ng/L | 10 ng/L federal MCL (2024) | 2024-08-29 to 2025-02-24 | Below limit | View evidence |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit) | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | 2024-08-29 to 2025-02-24 | Not detected | View evidence |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | 2024-08-29 to 2025-02-24 | Not detected | View evidence |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | 2024-08-29 to 2025-02-24 | Not detected | View evidence |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | 2024-08-29 to 2025-02-24 | Not detected | — |
| Lithium | 9.98 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit) | 2024-08-29 to 2025-02-24 | Below limit | 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 | 2017–2017 monitoring period | Above guideline | View evidence |
UCMR5 Analytical Results
UCMR5 Analytical Results: SOUTH LYON, CITY OF (MI0006110)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: SOUTH LYON, CITY OF (MI0006110)
US EPA SDWIS