Oakland County, Michigan
87 ZIP codes · Avg score 77/100 · Grade B · Updated 2026-06-03
Unlike many counties its size, Oakland County keeps violation rates low — all 87 ZIP codes score at or above the state average for tap water safety, with no systemic concerns flagged in the current data set.
How Oakland County Compares
How Oakland County Compares
Oakland County scores 3 points above the Michigan state average (74/100) and 9 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Oakland County, Michigan
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.8 (asthma 10.6%, diabetes 10.2%)
Estimated additional annual cost per homeowner: $944, driven primarily by flood
Infrastructure: 0.349% avg pipe failure probability, 25% of ZIPs at high risk
64% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Oakland County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 25 violations. Past 5 years: 58 total (58 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $944
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
536,302 housing units in Oakland County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Oakland County
Remediation costs are relatively manageable for most homeowners in Oakland County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Oakland County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Oakland County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Highland Greens Estates | 2,268 | 61 |
| 2 | City of Royal Oak, | 57,236 | 33 |
| 3 | Waterford Township | 73,441 | 30 |
| 4 | Southfield | 71,739 | 28 |
| 5 | Northville Crossing | 1,890 | 25 |
111 total water systems serve Oakland County.
All ZIP Codes in Oakland County
87 ZIP codes tracked in Oakland County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 48070 | Huntington Woods | 83 | B | 1 | $471K |
| 2 | 48095 | Washington | 83 | B | 1 | $393K |
| 3 | 48165 | New Hudson | 83 | B | 1 | $352K |
| 4 | 48167 | Northville | 83 | B | 0 | $431K |
| 5 | 48306 | Rochester | 83 | B | 0 | $522K |
| 6 | 48307 | Rochester | 83 | B | 0 | $329K |
| 7 | 48308 | Rochester | 83 | B | 0 | — |
| 8 | 48309 | Rochester | 83 | B | 0 | $395K |
| 9 | 48332 | Farmington | 83 | B | 0 | — |
| 10 | 48333 | Farmington | 83 | B | 0 | — |
| 11 | 48340 | Pontiac | 83 | B | 0 | $106K |
| 12 | 48341 | Pontiac | 83 | B | 0 | $125K |
| 13 | 48342 | Pontiac | 83 | B | 0 | $91K |
| 14 | 48343 | Pontiac | 83 | B | 0 | — |
| 15 | 48374 | Novi | 83 | B | 0 | $552K |
| 16 | 48375 | Novi | 83 | B | 0 | $349K |
| 17 | 48376 | Novi | 83 | B | 0 | — |
| 18 | 48377 | Novi | 83 | B | 0 | $332K |
| 19 | 48007 | Troy | 82 | B | 2 | — |
| 20 | 48068 | Royal Oak | 82 | B | 3 | — |
| 21 | 48073 | Royal Oak | 82 | B | 3 | $303K |
| 22 | 48084 | Troy | 82 | B | 2 | $420K |
| 23 | 48098 | Troy | 82 | B | 2 | $485K |
| 24 | 48099 | Troy | 82 | B | 2 | — |
| 25 | 48301 | Bloomfield Hills | 82 | B | 2 | $671K |
| 26 | 48302 | Bloomfield Hills | 82 | B | 2 | $624K |
| 27 | 48303 | Bloomfield Hills | 82 | B | 2 | — |
| 28 | 48320 | Keego Harbor | 82 | B | 4 (1 health) | $318K |
| 29 | 48324 | West Bloomfield | 82 | B | 2 (1 health) | $408K |
| 30 | 48325 | West Bloomfield | 82 | B | 2 (1 health) | — |
| 31 | 48327 | Waterford | 82 | B | 4 (1 health) | $242K |
| 32 | 48329 | Waterford | 82 | B | 4 (1 health) | $246K |
| 33 | 48359 | Lake Orion | 82 | B | 3 | $330K |
| 34 | 48360 | Lake Orion | 82 | B | 3 | $362K |
| 35 | 48361 | Lake Orion | 82 | B | 3 | — |
| 36 | 48362 | Lake Orion | 82 | B | 3 | $314K |
| 37 | 48346 | Clarkston | 81 | B | 1 | $295K |
| 38 | 48347 | Clarkston | 81 | B | 1 | — |
| 39 | 48348 | Clarkston | 81 | B | 1 | $421K |
| 40 | 48321 | Auburn Hills | 80 | B | 4 | — |
| 41 | 48326 | Auburn Hills | 80 | B | 4 | $235K |
| 42 | 48383 | White Lake | 80 | B | 7 | $305K |
| 43 | 48386 | White Lake | 80 | B | 7 | $295K |
| 44 | 48017 | Clawson | 79 | B | 3 | $252K |
| 45 | 48034 | Southfield | 79 | B | 5 | $259K |
| 46 | 48037 | Southfield | 79 | B | 5 | — |
| 47 | 48072 | Berkley | 79 | B | 0 | $289K |
| 48 | 48086 | Southfield | 79 | B | 5 | — |
| 49 | 48370 | Oxford | 79 | B | 5 | $393K |
| 50 | 48371 | Oxford | 79 | B | 5 | $353K |
| 51 | 48380 | Milford | 79 | B | 6 | $439K |
| 52 | 48381 | Milford | 79 | B | 6 | $387K |
| 53 | 48030 | Hazel Park | 78 | B | 0 | $141K |
| 54 | 48237 | Oak Park | 78 | B | 0 | $199K |
| 55 | 48331 | Farmington | 78 | B | 0 | $383K |
| 56 | 48335 | Farmington | 78 | B | 0 | $367K |
| 57 | 48336 | Farmington | 78 | B | 0 | $248K |
| 58 | 48012 | Birmingham | 77 | B | 10 (2 health) | — |
| 59 | 48067 | Royal Oak | 77 | B | 3 | $309K |
| 60 | 48083 | Troy | 77 | B | 2 | $293K |
| 61 | 48085 | Troy | 77 | B | 2 | $395K |
| 62 | 48304 | Bloomfield Hills | 77 | B | 2 | $482K |
| 63 | 48322 | West Bloomfield | 77 | B | 2 (1 health) | $374K |
| 64 | 48323 | West Bloomfield | 77 | B | 2 (1 health) | $467K |
| 65 | 48328 | Waterford | 77 | B | 4 (1 health) | $211K |
| 66 | 48350 | Davisburg | 75 | B | 0 | $352K |
| 67 | 48382 | Commerce Township | 75 | B | 0 | $405K |
| 68 | 48390 | Walled Lake | 75 | B | 1 | $288K |
| 69 | 48050 | New Haven | 74 | B | 2 (1 health) | $329K |
| 70 | 48075 | Southfield | 74 | B | 5 | $219K |
| 71 | 48076 | Southfield | 74 | B | 5 | $251K |
| 72 | 48009 | Birmingham | 73 | B | 10 (2 health) | $712K |
| 73 | 48069 | Pleasant Ridge | 73 | B | 0 | $436K |
| 74 | 48356 | Highland | 73 | B | 4 | $315K |
| 75 | 48391 | Walled Lake | 72 | B | 1 | — |
| 76 | 48393 | Wixom | 72 | B | 1 | $309K |
| 77 | 48220 | Ferndale | 71 | B | 2 | $230K |
| 78 | 48357 | Highland | 70 | B | 4 | $327K |
| 79 | 48054 | East China | 66 | C | 0 | $277K |
| 80 | 48442 | Holly | 65 | C | 16 (6 health) | $253K |
| 81 | 48387 | Union Lake | 63 | C | 0 | — |
| 82 | 48462 | Ortonville | 63 | C | 0 | $318K |
| 83 | 48071 | Madison Heights | 58 | C | 1 | $190K |
| 84 | 48330 | Drayton Plains | 53 | D | 0 | — |
| 85 | 48363 | Oakland | 53 | D | 0 | $568K |
| 86 | 48366 | Lakeville | 53 | D | 0 | — |
| 87 | 48367 | Leonard | 53 | D | 0 | $387K |
Recommended Buyer Guides for Oakland County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 64% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Oakland County, Michigan
Overview
Oakland County in Michigan covers 87 ZIP codes with an average Home Safety Score of B (77/100).
56 of 87 ZIP codes have recorded EPA violations. 19 health-based violations have been documented.
← Back to Michigan water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.