Frequent Questions

What is the federal standard for pH in drinking water?

There is no federally enforceable standard (i.e., Maximum Contaminant Level) for pH in drinking water.  EPA set a Secondary Maximum Contaminant Level (SMCL) or recommended range for pH in drinking water of 6.5 to 8.5.  SMCLs are developed to protect the aesthetic quality of water, such as taste, odor, color, and appearance.  SMCLs are non-enforceable guidelines that states may choose to implement.  Contact your state drinking water office to determine if your state set an enforceable pH level in drinking water.  State drinking water office contact information is available by clicking on your state at

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