Drinking water quality · 2024
· Verified
· PWSID MI0006900
What's in Warren, MI tap water
Only 9 of 27 core regulated contaminants were reported for Warren, MI. What was measured is clean — but most of the picture is missing.
- !1 contaminant within 20% of a limit
- !9 of 27 core regulated contaminants reported — 18 never appear in this report
- ✓Nothing over a federal limit
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −0 contaminants at or above a federal limit
- −4 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −16 core regulated contaminants never reported (9/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- Lead93% of the federal limit0.014 mg/L · limit 0.015 mg/L
There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.
Higher than 90% of MI systems that report it · higher than 95% of U.S. systems
+30 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| TTHM | 50 ug/L | 80 ug/L |
| PFOA | 2 ng/L | 4 ng/L |
| HAA5 | 20 ug/L | 60 ug/L |
| Chlorine | 0.95 mg/L | 4 mg/L |
| Fluoride | 0.6 mg/L | 4 mg/L |
| Copper | 0.1 mg/L | 1.3 mg/L |
| Nitrate | 0.31 mg/L | 10 mg/L |
| Chloride | 10.7 mg/L | — |
| Nitrite | Not detected mg/L | 1 mg/L |
| Sulfate | 24.5 mg/L | — |
| Aluminum | 0.046 mg/L | — |
| Calcium | 26.6 mg/L | — |
| Iron | 0.2 mg/L | — |
| Magnesium | 7.7 mg/L | — |
| Manganese | Not detected mg/L | — |
| Potassium | 1 mg/L | — |
| Silica | 2 mg/L | — |
| Sodium | 3.4 mg/L | — |
| Zinc | 0 mg/L | — |
| Alkalinity | 70 mg/L | — |
| Bicarbonate | 70 mg/L | — |
| Chemical Oxygen Demand | 2.8 mg/L | — |
| Dissolved Oxygen | 8.3 mg/L | — |
| Hardness | 105 mg/L | — |
| pH | 7.24 | — |
| Specific Conductance | 217 | — |
| Temperature | 14.2 | — |
| Total Dissolved Solids | 107 mg/L | — |
| Total Solids | 130 mg/L | — |
| Turbidity | 0.07 | — |
What this report doesn't tell you
18 of the 27 contaminants a community water system normally reports do not appear anywhere in Warren, MI's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
Where your water comes from · EPA SDWIS
Warren, MI buys its drinking water from GREAT LAKES WATER AUTHORITY.
Source
Treatment
Distribution
Also buys water from GREAT LAKES WATER AUTHORITY.
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.