Discolored water is usually not an emergency, but persistent discoloration means corrosion that should be addressed.
Why it happens in Boston
Galvanized supply pipe
Century-old galvanized risers and branches rust from the inside, releasing discolored water when taps open.
Water heater corrosion
Aging tank heaters in basements discolor hot water as the tank lining fails.
Main work and hydrant flushing
Work on street mains stirs up sediment that can temporarily discolor water across a block.
Signs to watch for
- Brown or orange water at first use
- Rust stains in sinks and toilets
- Discoloration in hot water only
- Discolored water after utility work
Emergency, or can it wait?
Call right away if…
- Discoloration with a strong chemical odor — contact the utility
Usually OK to schedule if…
- Temporary discoloration after utility work
What Boston homeowners can check first
- Is it hot water only, or hot and cold?
- Does it clear after running cold water a few minutes?
- Are neighbors seeing it too?
- Is there street or main work nearby?
- Check the water heater age from its serial number
- Look for rust at threaded pipe joints in the basement
How our plumbers fix it
- Run cold and hot taps separately to isolate the source.
- Identify pipe material at the meter, water heater and under sinks.
- Flush and inspect the water heater, including the anode and dip tube.
- Check for galvanized-to-copper joints without dielectric fittings.
- Test well water for iron, manganese and tannins.
Brown or Rusty Water in Boston: questions
Is rusty water in Boston safe to drink?
Temporary discoloration from main work usually clears; avoid drinking until it does and contact BWSC if it persists. Ongoing rust from your pipes means the plumbing needs attention.
Why is only my hot water brown?
The water heater is the likely source: sediment or a corroding tank. Flushing may help; persistent rust usually means replacement.
Will repiping fix rusty water in a Boston triple-decker?
If corroded galvanized pipe is the source, replacing it with copper or PEX eliminates the rust and usually improves pressure too.
Does Boston’s soft water corrode pipes?
MWRA treats water for corrosion control. Persistent discoloration usually comes from old galvanized pipe or an aging water heater inside the building.
Next steps
National guide: Brown or Rusty Water · Plumbing in Boston
