States › Michigan › Washtenaw County

Washtenaw County, MI Water Quality

Water quality data for 16 public water systems serving Washtenaw County, Michigan — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 16 water systems · 24 cities
✅
Excellent — All Systems Performing Well

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

A

Washtenaw County Earns a A

Washtenaw County: 24 communities across 16 water systems. 100.0% have no open violations.

  • Median lead where detected: 4.10 ppb
  • 16 communities with a lead detection, 8 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
4.1 ppb
Median Lead Level
County-wide, 90th percentile
16
Water Systems
Active CWS & NTNCWS
100%
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
  • Ann Arbor
    2.30 ppb
    No federal limits exceeded on record
    A
  • Ypsilanti charter
    4.10 ppb
    No federal limits exceeded on record
    A
  • Pittsfield charter
    Not detected
    No federal limits exceeded on record
    A
  • Ypsilanti
    4.10 ppb
    No federal limits exceeded on record
    A
  • Saline
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Chelsea
    Not detected
    Copper above the 1,300 ppb action level
    A
  • Dexter
    Not detected
    Copper above the 1,300 ppb action level
    A
  • Whitmore Lake
    3.00 ppb
    Copper above the 1,300 ppb action level
    B
  • Sylvan
    Not detected
    Copper above the 1,300 ppb action level
    A
  • Milan
    5.10 ppb
    Lead at 5.10 ppb, above a third of the action level
    A
County Lead Level — Median 4.1 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 4.1 ppb — 27.3% of the federal action level
Systems by Lead Level
Under 5 ppb
12
5 – 10 ppb
4
No Data
8

All Cities in Washtenaw County

Ann Arbor 2.30 ppb A
Ypsilanti charter 4.10 ppb A
Pittsfield charter Not detected A
Ypsilanti 4.10 ppb A
Saline Not detected A
Scio Not detected A
Milan 5.10 ppb A
Chelsea Not detected A
Dexter Not detected A
Superior charter 4.10 ppb A
Manchester 4.90 ppb B
York charter 5.10 ppb A
Salem 5.00 ppb B
Lodi Not detected A
Lima 3.00 ppb B
Whitmore Lake 3.00 ppb B
Webster 7.20 ppb B
Ann Arbor charter 2.30 ppb A
Northfield 2.00 ppb B
Augusta charter 4.10 ppb A
Sylvan Not detected A
Saline Not detected A
Dexter 4.00 ppb B
Bridgewater 2.00 ppb B
Showing 24 cities
No active violations Active violations

About Washtenaw County Drinking Water

Washtenaw County is served by 16 water systems covering 24 communities. No community here has an open violation on record.

Of the communities reporting lead results, 16 recorded a detection, with a median of 4.10 ppb — 27% of the federal action level. 8 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Washtenaw County tap water safe to drink?▼
No community in Washtenaw County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Washtenaw County?▼
Among communities with a detection the median is 4.10 ppb, 27% of the 15 ppb action level. 8 reported none detected and 0 reported no result.
How many water systems serve Washtenaw County?▼
16 community water systems serve 24 communities here.
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