1. (a) This part shall apply to contaminants in drinking water at concentrations that primarily affect aesthetic qualities relating to the public acceptance of drinking water, known as secondary contaminants. At considerably higher concentrations of secondary contaminants, health implications may also exist.

2. (b) Subject to (c), below, the SMCLs for community water systems and non-transient non-community water systems shall be as stated in Table 706-1, below:

   Table 706-1: Secondary Maximum Contaminant Levels

   Contaminant

   SMCL

   Aluminum

   0.05 - 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

   Methyl tertiary-butyl ether (MtBE)

   0.020 mg/L

   Odor

   3 threshold odor number

   pH

   6.5 - 8.5

   Silver

   0.1 mg/L

   Sodium

   250 mg/L

   Sulfate

   250 mg/L

   Sulfide

   0.05 mg/L

   Total Dissolved Solids (TDS)

   500 mg/L

   Zinc

   5 mg/L

3. (c) For aluminum, the SMCL based on color considerations shall be 0.05 mg/L and the SMCL based on treatment process considerations shall be 0.2 mg/L.

Source. #9699, eff 5-1-10; ss by #12665, eff 1-1-19