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City of South Lyon water quality report, rewritten

Serves
11,055
Connections
3,454
Water source
Groundwater
Based in
South Lyon, MI
County
Oakland
Owner
Local government
The ZIP code it serves

48178

PWSID MI00061102026 edition · EPA data

Read this first

  • Copper (above the health goal) In the latest period, 9 in 10 homes sampled were at or below 1.4 ppm, above the 1.3 ppm action level.

No health-based violations on file since 2016.

What handles it

What was found

Highlighted: above the health goal, or EPA’s health benchmark where there is no goal. Circled: above the legal limit in at least one sample, or the action level. Every scale puts that line at its middle.

Copper (above the health goal)

Comes from pipes, often your own

1.4 (above the action level)ppm

90th percentile, 2017

In the latest period, 9 in 10 homes sampled were at or below 1.4 ppm, above the 1.3 ppm action level.

What handles it

EPA SDWIS, lead and copper monitoring periods ending 2017. The pointer marks the latest period; each blue tick is an earlier one.

Lithium

Comes from the source

10.0ppb

Highest of 2 samples; found in one

Below EPA’s health reference level of 10 ppb. Lithium has no legal limit or health goal of its own.

What handles it

No certification claim covers this compound yet.

EPA UCMR 5, samples taken on Aug. 29, 2024. Each blue tick is one sample where it was found.

HFPO-DA (GenX)

Comes from the source

5.4ppt

Highest of 2 samples; found in one

Detected, below the legal limit and the health goal.

What handles it

No certification claim covers this compound yet.

EPA UCMR 5, samples taken on Feb. 24, 2025. Each blue tick is one sample where it was found.

Tested and not found

Below EPA’s minimum reporting level in every sample taken from Aug. 29, 2024 to Feb. 24, 2025. Not found means not measured above that level, which is not the same as zero.

All 29 compounds tested and not found
  • 11Cl-PF3OUdS
  • 4:2 FTS
  • 6:2 FTS
  • 8:2 FTS
  • 9Cl-PF3ONS
  • ADONA
  • Lead
  • NEtFOSAA
  • NFDHA
  • NMeFOSAA
  • PFBA
  • PFBS
  • PFDA
  • PFDoA
  • PFEESA
  • PFHpA
  • PFHpS
  • PFHxA
  • PFHxS
  • PFMBA
  • PFMPA
  • PFNA
  • PFOA
  • PFOS
  • PFPeA
  • PFPeS
  • PFTA
  • PFTrDA
  • PFUnA

Violations since 2016

No health-based violations on file with EPA since 2016.

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Compare five-year costs

Filters with those claims on a certifier’s listing

TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

What this report cannot tell you

  • Levels of everything else. Federal bulk data carries results for PFAS, lithium, lead and copper, and violations for the rest. Nitrate, arsenic, disinfection byproducts and other levels are in City of South Lyon’s own annual report, which it must send you every year.
  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.
  • Anything after the latest data. SDWIS data is from 2026 Q2; UCMR 5 samples are from Aug. 29, 2024 to Feb. 24, 2025.

What to do next

  1. Read up on Copper

    What each one does to health, where it comes from, and the certification claim that addresses it.

    About Copper

  2. Get the utility’s own report

    City of South Lyon must send you a water quality report every year. It lists nitrate, arsenic and byproduct levels this page cannot.

    How to read it

  3. Test your own tap for lead

    Your service line, solder and fixtures decide the lead at your faucet, not the utility’s average.

    Lead in your water: what to do

  4. Compare certified filters

    What the filters certified for these results cost over five years, cartridges included.

    Compare five-year costs

Other Michigan utilities

All Michigan utilities

Sources