Generally, the clear water dripping from a normal air conditioner condensate drain line is not toxic, as it is simply atmospheric moisture condensed out of the indoor air as it passes over cold evaporator coils. However, if that water sits stagnant in a dirty drain pan, clogged PVC pipe, or uncleaned air handler compartment, it quickly becomes a breeding ground for mold, mildew, bacteria, and slimy biological growth. Contact with contaminated standing water or breathing mold spores circulated through your HVAC ducts can trigger allergic reactions, respiratory irritation, and skin rashes, making routine cleaning essential. Verification: Inspect your indoor drain pan and coils periodically for musty odors, slime, or mold buildup.
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