Tap Water Quality Report
Tap water quality in ROYAL OAK, Michigan
Tap water in ROYAL OAK, Michigan receives a grade of B (88/100) from TapWaterSafety.org. It's served by ROYAL OAK, CITY OF. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in ROYAL OAK's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving ROYAL OAK.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 23.7 ppb, 395x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 25.0 ppb, 167x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 15.6 ppb, 156x above the EWG health guideline of 0.1 ppb.
EPA compliance record
Official U.S. EPA records for ROYAL OAK, CITY OF (system ID MI0005830) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for ROYAL OAK
Filters matched to the specific contaminants in ROYAL OAK's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in ROYAL OAK's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
23.7 ppb | 0.06 | — | — | — | — | — | 395× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
25.0 ppb | 0.15 | 80.0 | 100 | — | — | — | 167× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
15.6 ppb | 0.1 | 60.0 | 60 | — | — | — | 156× over |
| Chromium (hexavalent) Heavy metal |
0.0939 ppb | 0.02 | — | — | — | — | — | 4.7× over |
| Nitrate* Inorganic |
0.517 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 3.7× over |
| Vanadium Other |
0.0925 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.14 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Strontium Radiological |
0.098 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride* Inorganic |
0.633 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from ROYAL OAK, CITY OF.