Blue Stains in Bathroom Water: Causes & Solutions

Blue-green stains usually indicate copper corrosion from plumbing. Copper pipes react with oxygen and water, forming copper oxides that tint water, especially after sitting overnight.

Contributing Factors

• Low pH (acidic water) increases corrosivity.
• Hot water accelerates corrosion.
• High oxygen levels promote reaction.
• Presence of other metals (e.g., iron) can worsen it.

Solutions

• Test water for copper levels.
• Flush pipes regularly (run water a few minutes).
• Install a water filter.
• Adjust pH with a neutralizer if acidic.
• Replace old copper pipes with PVC or stainless steel.