The Secondary Maximum Contaminant Levels for public water systems deals with substances which affect the aesthetic quality of drinking water. They are presented here as recommended limits or ranges and are not grounds for rejection. The taste of water may be unpleasant and the usefulness of the water may be impaired if these standards are significantly exceeded.

TABLE 200-7

SECONDARY INORGANIC CONTAMINANTS

Contaminant Level

Aluminum 0.05 to 0.2 mg/L

Chloride 250 mg/L

Color 15 Color Units

Copper 1 mg/L

Corrosivity Non-corrosive

Fluoride 2.0 mg/L (see Note below)

Foaming Agents 0.5 mg/L

Iron 0.3 mg/L

Manganese 0.05 mg/L

Odor 3 Threshold Odor Number

pH 6.5-8.5

Silver 0.1 mg/L

Sulfate 250 mg/L (see Note below)

TDS 500 mg/L (see Note below)

Zinc 5 mg/L

Note: Maximum allowable Fluoride, TDS and Sulfate levels

are given in the Primary Drinking Water Standards,

R309-200-5(1). They are listed as secondary standards because

levels in excess of these recommended levels will likely cause

consumer complaint.

KEY: drinking water, quality standards, regulated contaminants

Date of Last Change: March 31, 2022

Notice of Continuation: February 10, 2025

Authorizing, and Implemented or Interpreted Law: 19-4-104