Narrow it down in five minutes
- Only first thing in the morning: water sat in the pipes overnight. Run the cold tap briefly and taste again.
- Only hot water: water heater or hot-side piping.
- Only one faucet: that fixture or its supply line.
- Every faucet, all the time: the water supply itself or the main plumbing.
- Only from a filter or fridge dispenser: check the filter's age.
Common causes
| Cause | Other clues |
|---|---|
| Iron | Orange stains, rusty tint (EPA lists metallic taste and reddish staining) |
| Copper | Blue-green stains around fixtures |
| Manganese | Black or brown stains, bitter taste |
| Zinc | Galvanized pipes; EPA lists a metallic taste |
| Low pH | Corrosion, pinhole leaks, stains; EPA notes low pH can cause a bitter metallic taste and corrosion |
| New pipes or fixtures | Started after recent plumbing work |
Related guides: blue-green stains, orange stains, changes after plumbing work.
What to test
- pH.
- Iron, manganese and copper.
- Total dissolved solids and hardness.
- Lead, through a certified lab, especially in older homes with brass, solder or a possible lead service line. Lead has no taste, so a metallic taste does not tell you whether lead is there or not; only a test does. See lead testing and filters.
On city water, compare your results with your utility's Water Quality Report (Consumer Confidence Report). If the report looks normal but your tap tastes metallic, the cause is more likely inside the home.
Fixes that match the cause
- Standing water: run cold water briefly before drinking; use cold water for cooking, as the EPA recommends.
- One faucet: repair or replace the fixture or supply line.
- Low pH or iron on a well: treatment at the source, sized from a test. See well water systems.
- Drinking water taste: a point-of-use system such as alkaline reverse osmosis, checking that the model is certified for the specific metals you want reduced.
When to call your utility
If the metallic taste starts suddenly on city water across the whole house, call your utility's customer service. They can tell you about nearby work or system changes and may sample your tap.
Questions to ask before buying a system
- Which metal or pH result is the recommendation based on?
- Is the cause in the water supply or in my plumbing?
- Is the proposed model certified for that specific metal?
- What maintenance keeps it performing?
Jorge gives you an itemized quote after the free test, and if a plumber is the better fix, he will say so.
Sources:
https://www.epa.gov/sdwa/secondary-drinking-water-standards-guidance-nuisance-chemicals
https://www.epa.gov/ground-water-and-drinking-water/basic-information-about-lead-drinking-water
https://www.epa.gov/ccr/ccr-information-consumers
https://extension.psu.edu/iron-and-manganese-in-private-water-systems
https://www.epa.gov/sdwa/secondary-drinking-water-standards-guidance-nuisance-chemicals
https://www.epa.gov/ground-water-and-drinking-water/basic-information-about-lead-drinking-water
https://www.epa.gov/ccr/ccr-information-consumers
https://extension.psu.edu/iron-and-manganese-in-private-water-systems
Updated 2026-10-17 · Living Waters · Jorge Canela, Water Quality Specialist