What are secondary drinking water standards?

Secondary drinking water standards refer to guidelines established primarily for aesthetic and functional aspects of water quality rather than for health protection. These standards address issues such as taste, odor, and appearance, ensuring that the water remains acceptable and pleasant for consumers. While they are important for the overall perception of drinking water quality, they are not mandatory levels that are enforced in the same manner as primary standards, which focus on protecting public health by limiting harmful contaminants.

These aesthetic standards can include factors like the control of substances that may cause changes in color or taste, such as iron or manganese, but they do not pose direct health risks. Therefore, their voluntary nature allows for flexibility and encourages water utilities to improve the quality of their water supply in a manner that enhances consumer satisfaction.