Call a Plumber Soon Avg. cost: $300
Discolored Water: Causes, Fixes & When to Call a Plumber
Brown or rusty water is caused by disturbed pipe sediment (run cold water for 2 minutes to clear), corroding galvanized steel pipes, or water heater sediment if only the hot water is discolored. Discoloration that doesn't clear within 5 minutes warrants a call to your plumber or utility company.
What Causes Discolored Water?
- Disturbed sediment in distribution mains (municipal work nearby)
- Corroding galvanized steel pipes inside the home
- Rust or sediment buildup in the water heater tank
- Well water with high iron content
- New water heater anode rod reacting with water chemistry
How to Fix Discolored Water: Step-by-Step
- 1Run the cold water tap for 2–5 minutes
- 2If only hot water is discolored, flush the water heater: attach a hose to the drain valve and run until clear
- 3Check if neighbors have the same issue (municipal problem)
- 4Have water tested if discoloration persists (home test kits available)
When Should You Call a Plumber?
Call a plumber if: discoloration only appears in hot water (heater flushing doesn't help), all cold water remains discolored for more than 10 minutes, you have galvanized pipes (pipe replacement may be needed), or you notice flaking particles in the water.
How Much Does Discolored Water Repair Cost?
Average Cost $300
Typical Range $100 – $2,500
Costs vary by location, severity, and whether emergency service is needed. Prices shown are national averages. Get a free quote from a local plumber →
Frequently Asked Questions About Discolored Water
- Temporarily discolored water due to pipe disturbance is generally not a health risk but should not be consumed until clear. Persistent discoloration from corroding pipes can introduce lead or other metals — get it tested and do not drink until cleared.
- Brown hot water exclusively indicates sediment or corrosion inside the water heater tank. Flushing the tank annually prevents this. If flushing doesn't resolve it and the unit is over 10 years old, replacement may be needed.
- Galvanized steel pipes look grey/silver and are magnetic. Homes built before 1970 commonly have them. They corrode from the inside, reducing flow and eventually causing rust-colored water. Repipe with copper or PEX is the permanent solution.