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Updated 2026-10-15
County water report

Oakland County Water Quality: 20 Cities Ranked by the Records

Oakland County, Michigan: 20 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Oakland County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Copper (90th percentile)Detected in 1 system1.3 mg/L federal action level · US EPAHighest1.4 mg/L
LithiumDetected in 1 system of 20 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest9.98 µg/L
  • SOUTH LYON, CITY OF9.98 µg/LSample date: 2024-08-29 to 2025-02-24
  • AUBURN HILLSNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-01-30 to 2023-10-25
  • BERKLEYNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-04-17 to 2024-01-22
  • BIRMINGHAMNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-02-28 to 2023-11-06
  • CLAWSONNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-03-27 to 2023-12-11
  • COMMERCE TOWNSHIPNot detected · below 9.0 µg/L lab reporting limitSample date: 2025-02-24 to 2025-11-19
  • FARMINGTON, CITY OFNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-10-18 to 2025-07-14
  • FERNDALENot detected · below 9.0 µg/L lab reporting limitSample date: 2024-07-29 to 2025-04-15
  • HAZEL PARKNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-02-06 to 2024-11-05
  • MADISON HEIGHTSNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-02-14 to 2023-11-28
  • NORTHVILLE TOWNSHIPNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-10-02 to 2025-07-09
  • NOVI, CITY OFNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-03-14 to 2023-12-13
  • OAK PARKNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-02-21 to 2024-09-17
  • OXFORD TOWNSHIPNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-06-06 to 2023-12-05
  • PONTIACNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-07-25 to 2024-04-24
  • ROCHESTERNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-05-03 to 2023-11-13
  • ROYAL OAK, CITY OFNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-02-21 to 2023-11-07
  • SOUTHFIELDNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-11-12 to 2025-08-13
  • TROYNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-03-12 to 2024-12-02
  • WIXOM, CITY OFNot detected · below 9.0 µg/L lab reporting limitSample date: 2025-02-12 to 2025-11-11
Lead (90th percentile)Detected in 11 systems of 20 tested15 µg/L federal action level · US EPAHighest9 µg/L
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)Detected in 1 system of 20 tested10 ng/L federal MCL (2024) · US EPAHighest5.4 ng/L
  • SOUTH LYON, CITY OF5.4 ng/LSample date: 2024-08-29 to 2025-02-24
  • AUBURN HILLSNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-01-30 to 2023-10-25
  • BERKLEYNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-04-17 to 2024-01-22
  • BIRMINGHAMNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-02-28 to 2023-11-06
  • CLAWSONNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-03-27 to 2023-12-11
  • COMMERCE TOWNSHIPNot detected · below 5.0 ng/L lab reporting limitSample date: 2025-02-24 to 2025-11-19
  • FARMINGTON, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-10-18 to 2025-07-14
  • FERNDALENot detected · below 5.0 ng/L lab reporting limitSample date: 2024-07-29 to 2025-04-15
  • HAZEL PARKNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-02-06 to 2024-11-05
  • MADISON HEIGHTSNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-02-14 to 2023-11-28
  • NORTHVILLE TOWNSHIPNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-10-02 to 2025-07-09
  • NOVI, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-03-14 to 2024-07-24
  • OAK PARKNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-02-21 to 2024-09-17
  • OXFORD TOWNSHIPNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-06-06 to 2023-12-05
  • PONTIACNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-07-25 to 2024-04-24
  • ROCHESTERNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-05-03 to 2023-11-13
  • ROYAL OAK, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-02-21 to 2023-11-07
  • SOUTHFIELDNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-11-12 to 2025-08-13
  • TROYNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-03-12 to 2024-12-02
  • WIXOM, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2025-02-12 to 2025-11-11
Perfluorobutanoic acid (PFBA)Detected in 4 systems of 20 testedNo federal or state limit; shown for transparencyHighest8.2 ng/L
  • AUBURN HILLS8.2 ng/LSample date: 2023-01-30 to 2023-10-25
  • OAK PARK6.3 ng/LSample date: 2023-02-21 to 2024-09-17
  • BIRMINGHAM5.4 ng/LSample date: 2023-02-28 to 2023-11-06
  • PONTIAC5.1 ng/LSample date: 2023-07-25 to 2024-04-24
  • BERKLEYNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-04-17 to 2024-01-22
  • CLAWSONNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-03-27 to 2023-12-11
  • COMMERCE TOWNSHIPNot detected · below 5.0 ng/L lab reporting limitSample date: 2025-02-24 to 2025-11-19
  • FARMINGTON, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-10-18 to 2025-07-14
  • FERNDALENot detected · below 5.0 ng/L lab reporting limitSample date: 2024-07-29 to 2025-04-15
  • HAZEL PARKNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-02-06 to 2024-11-05
  • MADISON HEIGHTSNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-02-14 to 2023-11-28
  • NORTHVILLE TOWNSHIPNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-10-02 to 2025-07-09
  • NOVI, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-03-14 to 2024-07-24
  • OXFORD TOWNSHIPNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-06-06 to 2023-12-05
  • ROCHESTERNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-05-03 to 2023-11-13
  • ROYAL OAK, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-02-21 to 2023-11-07
  • SOUTH LYON, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-08-29 to 2025-02-24
  • SOUTHFIELDNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-11-12 to 2025-08-13
  • TROYNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-03-12 to 2024-12-02
  • WIXOM, CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2025-02-12 to 2025-11-11
27 PFAS tested, none detected in any systemShow

Tested in these 20 systems: AUBURN HILLS, BERKLEY, BIRMINGHAM, CLAWSON, COMMERCE TOWNSHIP, FARMINGTON, CITY OF, FERNDALE, HAZEL PARK, MADISON HEIGHTS, NORTHVILLE TOWNSHIP, NOVI, CITY OF, OAK PARK, OXFORD TOWNSHIP, PONTIAC, ROCHESTER, ROYAL OAK, CITY OF, SOUTH LYON, CITY OF, SOUTHFIELD, TROY, WIXOM, CITY OF

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorobutanesulfonic acid (PFBS)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorohexanesulfonic acid (PFHxS)
  • Perfluorohexanoic acid (PFHxA)
  • Perfluorononanoic acid (PFNA)
  • Perfluorooctanesulfonic acid (PFOS)
  • Perfluorooctanoic acid (PFOA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluoropentanoic acid (PFPeA)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
20 cities

Cities ranked by the records

Showing 6 of 20 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Oakland CountyPFAS detected in 5 of 20 cities; none had a sample above a 2024 EPA limit
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Michigan
Lead

0of 20 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Michigan
Who supplies the county

Largest water systems

  1. TroyTROY · MI0006690
    85,854 served
  2. SouthfieldSOUTHFIELD · MI0006160
    71,739 served
  3. PontiacPONTIAC · MI0005440
    63,776 served
  4. Royal OakROYAL OAK, CITY OF · MI0005830
    57,236 served
  5. NoviNOVI, CITY OF · MI0004870
    56,780 served
  6. NorthvilleNORTHVILLE TOWNSHIP · MI0004845
    32,103 served
  7. Madison HeightsMADISON HEIGHTS · MI0004000
    29,694 served
  8. Oak ParkOAK PARK · MI0004880
    29,654 served
  9. FerndaleFERNDALE · MI0002280
    22,105 served
  10. Auburn HillsAUBURN HILLS · MI0005450
    21,412 served
Questions

Frequently asked

How does Oakland County tap water compare across cities?

PurityMap ranks 20 cities in Oakland County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Troy's main water system: TROY · PWSID MI0006690 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Oakland County cities had a PFAS sample above a 2024 EPA limit?

None of the 20 Oakland County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 5.

Is there lead in Oakland County tap water?

Utilities report lead as a 90th-percentile result from home taps. 11 of 20 Oakland County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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