Rule 3745-82-02 | Secondary maximum contaminant levels.
The secondary maximum contaminant levels for public water systems are as follows:
| Contaminant | Level |
| Aluminum* | 0.05 to 0.2 mg/L |
| Chloride | 250 mg/L |
| Color | 15 color units |
| Copper | 1.0 mg/L |
| Corrosivity | non-corrosive |
| Fluoride | 2.0 mg/L |
| Foaming Agents | 0.5 mg/L |
| Iron | 0.3 mg/L |
| Manganese | 0.05 mg/L |
| Odor | 3 TON (threshold odor number) |
| pH | 7.0 - 10.0 |
| Silver | 0.1 mg/L |
| Sulfate | 250 mg/L |
| Total dissolved solids (TDS) | 500 mg/L |
| Zinc | 5 mg/L |
*The secondary maximum contaminant level for aluminum is a range, with the precise level applicable to each public water system to be determined by the director.
Last updated September 10, 2026 at 10:55 AM
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