Tap water that appears frothy, bubbly, or soapy when first drawn is typically caused by entrained air under high pressure, a malfunctioning aerator drawing in excess air, or chemical foaming agents in rare cases. If the bubbles dissipate rapidly within a minute, it is simply pressurized air escaping the water stream. However, if the water maintains a thick, soap-like foam or leaves a chemical residue, it can indicate contamination from backflow issues in your plumbing system, detergent residue trapped in a newly installed filter, or localized water treatment reactions. Verification: Let the water sit in a glass to see if the bubbles vanish quickly, and inspect your faucet aerator for defects.
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