The internet will tell you tap water is killing your plants. For most plants, it isn’t — and chasing the wrong cause wastes effort. Here’s the honest line between “doesn’t matter” and “actually matters.”
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First: it’s probably not the water
When a houseplant has brown leaf tips, the most likely cause is low humidity, with inconsistent watering another common factor — not the tap (Iowa State Extension). Fix those first.
When tap water genuinely matters
For a specific set of sensitive species it does: chlorine and other chemicals such as fluoride can cause brown leaf tips over time on sensitive plants like spider plant, ti plant, dracaena, prayer plant and calathea (Iowa State Extension). If you own those and have ruled out humidity, the water is a reasonable suspect.
Salt buildup also browns tips
Excess soluble salts — often from over-fertilizing — also cause brown tips and a struggling plant (Iowa State Extension). “Brown tips” alone never means “bad water”; it’s one of several causes you diagnose, not assume.
Softened water — avoid it
Home-softened water trades calcium for sodium and carries extra dissolved salts; it’s widely advised against for houseplants.
The honest take on “let it sit 24 hours”
Half-true. Standing water off-gasses chlorine, but it does not remove chloramine (used by many modern utilities) or fluoride. For genuinely sensitive species the realistic fix is a different water source — rainwater or distilled — rather than relying on standing the water.
Bottom line
For most plants and homes, tap water is fine. Diagnose brown tips — humidity, watering, salts — before blaming the water. Reserve filtered/rain/distilled for known sensitive species when other causes are ruled out.
Related: Why Are My Plant Leaves Turning Yellow?, the Troubleshooting hub, and How Often to Water Houseplants. Part of Houseplant Care Basics.