Michigan
Water quality data from the EPA Safe Drinking Water Information System
Water Systems
27,019
Active public water systems
Population Served
9.14M
Residents with piped water
Lead Violations
161
Systems exceeding 15 ppb
Copper Violations
260
Lead & Copper Rule
Average Lead Level
EPA Action Level: 15 ppb
MCLG (health goal): 0 ppb
Average across 2240 systems with reported lead data.
Violations Detected
421 water systems in Michigan have reported violations under the Lead and Copper Rule. These utilities are required to notify customers and take corrective action.
Water Systems: Highest Lead Levels
| System Name | City | Population | Lead Level | Status | Sample Date |
|---|---|---|---|---|---|
| GROSSE ILE | 10,371 | 19.20 ppb | Violation | 2025-12-31 | |
| MARQUETTE | 20,629 | 19.00 ppb | Violation | 2025-12-31 | |
| MADISON HEIGHTS | 29,694 | 17.90 ppb | Violation | 2025-12-31 | |
| GARDEN CITY | 27,625 | 17.60 ppb | Violation | 2025-06-30 | |
| INKSTER | 25,076 | 17.60 ppb | Violation | 2025-12-31 | |
| TAYLOR | 63,409 | 16.30 ppb | Violation | 2025-12-31 | |
| GROSSE POINTE WOODS | 16,135 | 13.30 ppb | OK | 2025-12-31 | |
| ROSEVILLE | 14,236 | 12.40 ppb | OK | 2025-06-30 | |
| WAYNE | 17,593 | 11.30 ppb | OK | 2025-06-30 | |
| CLINTON | 22,413 | 10.70 ppb | OK | 2025-06-30 | |
| EAST GRAND RAPIDS | 11,637 | 10.10 ppb | OK | 2025-12-31 | |
| BAY CITY | 32,255 | 10.00 ppb | OK | 2025-06-30 | |
| SAGINAW | 44,058 | 9.00 ppb | OK | 2025-12-31 | |
| FERNDALE | 22,105 | 9.00 ppb | OK | 2025-12-31 | |
| OWOSSO | 16,353 | 9.00 ppb | OK | 2025-12-31 |
Showing top 15 of 2042 systems with lead data. Action level: 15 ppb.
Systems With Active Violations
These water systems have exceeded EPA limits and must take corrective action.
TAYLOR · Pop. 63,409
Lead: 16.30 ppb (2025-12-31)
BATTLE CREEK · Pop. 43,975
Lead: 2.00 ppb (2025-12-31)
MADISON HEIGHTS · Pop. 29,694
Lead: 17.90 ppb (2025-12-31)
GARDEN CITY · Pop. 27,625
Lead: 17.60 ppb (2025-06-30)
INKSTER · Pop. 25,076
Lead: 17.60 ppb (2025-12-31)
MT PLEASANT · Pop. 21,688
Lead: 1.40 ppb (2024-12-31)
MARQUETTE · Pop. 20,629
Lead: 19.00 ppb (2025-12-31)
SAULT STE. MARIE · Pop. 14,689
Lead: 1.50 ppb (2025-12-31)
COLDWATER · Pop. 13,822
Lead: 5.40 ppb (2025-12-31)
EAST LANSING · Pop. 12,793
Lead: 2.00 ppb (2025-12-31)
SOUTH LYON · Pop. 11,055
Lead: 0.00 ppb (2025-12-31)
GROSSE ILE · Pop. 10,371
Lead: 19.20 ppb (2025-12-31)
Water Source Types
Air Quality
GoodAvg AQI
45.2
PM2.5
6.4 µg/m³
Unhealthy Days
4
Primary Pollutant
Ozone
Source: EPA AirNow & American Lung Association 2024 State of the Air. AQI scale: 0–50 Good · 51–100 Moderate · 101–150 Sensitive Groups · 151+ Unhealthy.
PFAS Contamination
Moderate DetectionPFAS (per- and polyfluoroalkyl substances), known as “forever chemicals,” are a group of synthetic chemicals that persist indefinitely in the environment and human body. The EPA set a maximum contaminant level (MCL) of 4 parts per trillion (ppt) for PFOA and PFOS in April 2024. View national PFAS tracker →
Systems Tested
568
PFAS Detected
228
Detection Rate
40.1%
Exceeding MCL (4 ppt)
58(10.2%)
Highest recorded level: 620 ppt (EPA MCL: 4 ppt). Listed as worst contamination state. State has MCLs for 7 PFAS. Major hotspots: Parchment, Belmont, Rockford (3M plant), Kent County. Largest private well contamination population (USGS)