waterbycounty
EPA SDWIS

Oakland County Water Quality

Oakland County, Michigan

Water Grade

B

Water Score

62.6

Violations

51

State Rank

#38

of 83 (1 = best)

EPA SDWIS Compliance

Drinking Water Quality

Water Quality Grade

B

Based on EPA compliance history and violation data

Water Score

62.6/100

Higher = better quality

Health Violations

51

Health-based violations

Violation Rate

4.9%

Systems with violations

Water Advisory: Oakland County

Water Verdict

Oakland County receives a fair water quality assessment with a grade of B and a score of 62.6 out of 100. The water supply meets baseline federal standards, but there may be periods of elevated contaminant levels or infrastructure concerns worth monitoring.

Violation Context

Oakland County has recorded 51 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 4.9 violations per 1,000 residents, this rate is moderate and suggests recurring water quality challenges.

Consumer Guidance

Tap water in Oakland County is generally safe to drink based on available data. Residents should still review their utility's annual Consumer Confidence Report for transparency on detected contaminants. With 51 recorded health violations, staying informed about utility communications and boil-water notices is especially important. For long-term peace of mind, request your utility's latest Consumer Confidence Report and consider independent water testing if you have specific health concerns.

Regional Context

Oakland County has water quality close to the average county in Michigan. Its water score is within 4.1 points of the state average, meaning its overall water system performance is broadly representative of Michigan as a whole.

Past 5 years

Water Quality Monitoring

Monitoring Sites

67

Active in the past 5 years

Measurements Recorded

17K

17,424 total readings

Most Measured

  • Physical
  • Not Assigned
  • Microbiological

Categories measured most frequently

Data from the EPA Water Quality Portal (WQP), aggregating monitoring records from federal, state, and tribal sources. Each measurement represents a single sample analyzed for a specific characteristic (e.g., E. coli, pH, dissolved oxygen, nitrogen).

Live USGS Streamgage

River & Stream Conditions

Current Discharge

80.5cfs

May 14, 7:00 PM UTC

vs Long-Term Average

73%

Below typical

Primary Streamgage

CLINTON RIVER AT AUBURN HILLS, MI

USGS site
04161000
Drainage area
123 sq mi
Long-term mean
110 cfs

One representative streamgage (the one with the largest drainage area in the county). Many counties have multiple gauges — this view summarizes the primary one. The long-term mean is the full-record annual average; "% of typical" compares the latest reading against that average.

Improve your water quality at home

Berkey filters remove 99.9%+ of contaminants from tap water.

Shop Berkey →

Sponsored

Test your tap water

Tap Score provides professional mail-in water testing.

Get Tested →

Frequently Asked Questions

What is the water quality in Oakland County, Michigan?
Oakland County, Michigan has a drinking-water quality grade of B with a score of 62.6/100, based on EPA SDWIS compliance data. The county has 51 health-based drinking water violations over the past 5 years. Watershed health, monitoring records, and live streamflow are reported separately on this page.
Are there any water violations in Oakland County?
Oakland County has 51 health-based drinking water violations recorded by the EPA over the past 5 years. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs). Violations may have been resolved — check with your local water utility for current status.
How much water-quality monitoring happens in Oakland County?
EPA's Water Quality Portal records 17,424 measurements from 67 monitoring sites in Oakland County over the past five years. The most frequently measured characteristic groups are Physical, Not Assigned, Microbiological. Each measurement is a single sample analyzed for one characteristic (E. coli, pH, dissolved oxygen, etc.). High monitoring density means more scientific evidence behind any reported signal — it does not by itself indicate water quality.
What's happening with rivers in Oakland County right now?
Oakland County's primary USGS streamgage on the CLINTON RIVER is currently reading 80.5 cubic feet per second — 73% of the long-term mean of 109.79 cfs. Flow is within typical range for this gauge. For genuine real-time data, visit waterdata.usgs.gov.
How does Oakland County water compare to the Michigan average?
Oakland County's SDWIS water quality score of 62.6/100 is higher than the Michigan state average of 58.5. The average water quality grade across Michigan is D, based on data from 83 counties with available SDWIS data.
Is tap water safe to drink in Oakland County?
Based on EPA SDWIS data, Oakland County has a water quality grade of B (62.6/100). This indicates good to excellent water quality with strong SDWIS compliance. The grade speaks to the public water system, not the watershed — for watershed-level concerns, see the Watershed Health zone. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).
Why does Oakland County have so many water violations?
Oakland County has 51 health-based drinking water violations on record from the EPA SDWIS database. A higher violation count can result from aging infrastructure, underfunded water utilities, agricultural runoff contamination, or industrial pollution. Counties with more water systems may also see more violations simply due to scale. Residents concerned about water quality should consider independent water testing and home filtration systems.
How does Oakland County rank for water quality in Michigan?
Oakland County ranks #38 out of 83 counties in Michigan by SDWIS water quality score (1 = best). With a score of 62.6/100, it falls in the middle third of counties statewide. The ranking reflects EPA SDWIS compliance only — not watershed impairment, monitoring density, or streamflow, which are tracked separately on this page.

Counties with Similar Water Quality

Chippewa County

Michigan

B

63.0

Water score

Ingham County

Michigan

C

61.7

Water score

Washtenaw County

Michigan

C

61.4

Water score

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Water-quality monitoring counts from the EPA Water Quality Portal (WQP) — federated USGS, EPA, and state agency sampling records over a rolling 5-year window.

Live streamflow from the USGS National Water Information System (NWIS) — continuous discharge measurements from the largest-drainage gauge in each county, compared against the full-record long-term annual mean.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

By Logan Johnson, Founder & Data EditorUpdated Reviewed by Logan Johnson, Founder & Data Editor

Explore more data for Oakland County

Property TaxCost of LivingCrime RateIncomeHealthSchoolsDisaster RiskWeatherCounty Score