States › Michigan › Oakland County

Oakland County, MI Water Quality

Water quality data for 46 public water systems serving Oakland County, Michigan — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 46 water systems · 51 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Oakland County Earns a A

Oakland County: 51 communities across 46 water systems. 96.1% have no open violations.

  • Median lead where detected: 3.05 ppb
  • 28 communities with a lead detection, 23 reporting none detected
  • 2 communities with PFAS above the federal limit
  • 2 with significant inspection deficiencies
  • 96.1% of communities have no open violations
3.05 ppb
Median Lead Level
County-wide, 90th percentile
46
Water Systems
Active CWS & NTNCWS
96%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Farmington Hills
    Not detected
    No federal limits exceeded on record
    A
  • Southfield
    Not detected
    No federal limits exceeded on record
    A
  • Rochester Hills
    1.30 ppb
    No federal limits exceeded on record
    A
  • Pontiac
    1.60 ppb
    No federal limits exceeded on record
    A
  • Royal Oak
    4.00 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Holly
    4.00 ppb
    1 violation currently open
    C
  • Rose
    4.00 ppb
    1 violation currently open
    C
  • Independence charter
    2.00 ppb
    PFAS above the limit at 1 of 6 sampling points
    C
  • Village of Clarkston
    2.00 ppb
    PFAS above the limit at 1 of 6 sampling points
    C
  • Groveland
    9.00 ppb
    1 significant inspection deficiency
    C
County Lead Level — Median 3.05 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 3.05 ppb — 20.3% of the federal action level
Systems by Lead Level
Under 5 ppb
19
5 – 10 ppb
9
No Data
23

All Cities in Oakland County

Troy Not detected A
Farmington Hills Not detected A
Southfield Not detected A
Rochester Hills 1.30 ppb A
Waterford charter 1.00 ppb A
Pontiac 1.60 ppb A
Royal Oak 4.00 ppb A
Novi Not detected A
West Bloomfield charter Not detected A
Bloomfield charter Not detected A
Oak Park Not detected A
Madison Heights 7.40 ppb A
Independence charter 2.00 ppb C
Commerce charter Not detected A
Auburn Hills Not detected A
Birmingham 3.10 ppb A
Ferndale 9.00 ppb B
Oxford charter 1.50 ppb A
Hazel Park 7.00 ppb A
White Lake charter 3.00 ppb A
Wixom Not detected A
Orion charter Not detected A
South Lyon Not detected A
Lyon charter 2.00 ppb B
Clawson 6.20 ppb A
Southfield Not detected A
Highland charter Not detected A
Milford charter 4.00 ppb A
Walled Lake Not detected B
Holly 4.00 ppb C
Rochester 1.70 ppb A
Oakland charter Not detected A
Farmington Not detected A
Northville 0.90 ppb A
Huntington Woods Not detected A
Bloomfield Hills Not detected B
Berkley 6.70 ppb A
Lathrup Village Not detected A
Brandon charter 8.00 ppb B
Pleasant Ridge 7.90 ppb B
Royal Oak charter 1.50 ppb B
Keego Harbor Not detected B
Orchard Lake Village 1.70 ppb B
Springfield charter 3.00 ppb B
Sylvan Lake Not detected B
Village of Clarkston 2.00 ppb C
Addison 5.00 ppb B
Rose 4.00 ppb C
Groveland 9.00 ppb C
Novi Not detected A
Lake Angelus 1.00 ppb A
Showing 51 cities
No active violations Active violations

About Oakland County Drinking Water

Oakland County is served by 46 water systems covering 51 communities. 96% have no open violations.

Of the communities reporting lead results, 28 recorded a detection, with a median of 3.05 ppb — 20% of the federal action level. 23 reported none detected, which means below the laboratory limit rather than an absence of lead.

2 of 51 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 2 of them.

Frequently Asked Questions

Is Oakland County tap water safe to drink?▼
96% of communities have no open violation. 2 of 51 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Oakland County?▼
Among communities with a detection the median is 3.05 ppb, 20% of the 15 ppb action level. 23 reported none detected and 0 reported no result.
How many water systems serve Oakland County?▼
46 community water systems serve 51 communities here.
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