County · Michigan
Oakland County, Michigan: drinking water records
This overview covers 68 ZIP codes and 108 community water systems in Oakland County. It also stands in for 6 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Waterford Township MI0006910 | 73,441 | 720 | 1 | 1 | 1 ppb |
| Ferndale MI0002280 | 22,105 | 120 | 0 | 1 | 9 ppb |
| Birmingham MI0000730 | 20,472 | 120 | 1 | 2 | 3.1 ppb |
| Holly, Village of MI0003200 | 8,557 | 60 | 0 | 1 | 4 ppb |
| Troy MI0006690 | 85,854 | 240 | 0 | 0 | 0 ppb |
| Rochester Hills MI0000325 | 74,000 | 120 | 0 | 0 | 1.3 ppb |
| Southfield MI0006160 | 71,739 | 120 | 0 | 0 | 0 ppb |
| Pontiac MI0005440 | 63,776 | 120 | 1 | 0 | 1.6 ppb |
| Royal Oak, City of MI0005830 | 57,236 | 120 | 0 | 0 | 4 ppb |
| Farmington Hills, City of MI0002240 | 56,984 | 120 | 0 | 0 | 0 ppb |
| Novi, City of MI0004870 | 56,780 | 240 | 0 | 0 | 0 ppb |
| West Bloomfield Township MI0006975 | 49,479 | 120 | 0 | 0 | 0 ppb |
| Bloomfield Township MI0000790 | 41,691 | 120 | 0 | 0 | 0 ppb |
| Orion Township MI0005035 | 33,000 | 120 | 0 | 0 | 0 ppb |
| Madison Heights MI0004000 | 29,694 | 120 | 0 | 0 | 7.4 ppb |
| Oak Park MI0004880 | 29,654 | 120 | 1 | 0 | 0 ppb |
| Auburn Hills MI0005450 | 21,412 | 120 | 1 | 0 | 0 ppb |
| Commerce Township MI0001573 | 19,811 | 120 | 0 | 0 | 0 ppb |
| Hazel Park MI0003100 | 16,400 | 120 | 0 | 0 | 7 ppb |
| Berkley MI0000630 | 14,970 | 120 | 0 | 0 | 6.7 ppb |
| Wixom, City of MI0007135 | 13,928 | 120 | 0 | 0 | 0 ppb |
| Clawson MI0001440 | 11,825 | 120 | 0 | 0 | 6.2 ppb |
| Independence Township MI0003342 | 11,790 | 360 | 8 | 0 | 2 ppb |
| Farmington, City of MI0002230 | 11,597 | 120 | 0 | 0 | 0 ppb |
| South Lyon, City of MI0006110 | 11,055 | 60 | 1 | 0 | 0 ppb |
ZIP reports in Oakland County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 48348, 48363, 48367, 48370, 48380, 48462.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.