It can be unsettling to turn on the tap and notice a scent or flavor that doesn’t belong. While New York City’s municipal water is generally of high quality, its journey through miles of aging infrastructure—and eventually your building’s internal plumbing—can introduce temporary changes.
Most taste and odor issues are manageable, but knowing how to troubleshoot the cause is the best first step to ensuring your water is safe.
1. Simple Troubleshooting: The “Glass Test”
Before assuming the issue is with the water supply itself, perform this quick test to rule out your sink or drains:
- Fill a clean glass with cold water from the tap.
- Step away from the sink area (to another room) before smelling or tasting the water.
- Evaluate: If the odor or taste is gone once you are away from the sink, the problem is likely your drain or garbage disposal, not your water. Drains often harbor organic matter (food, soap, hair) that creates a musty or “rotten” smell when agitated by running water.
2. Common Causes of Taste and Odor Issues
The “Bleachy” or Chemical Smell
- The Cause: Chlorine or chloramine, which the city uses to disinfect water and keep it free of pathogens.
- The Fix: This is usually safe but unpleasant. You can let a pitcher of water sit in the refrigerator for a few hours, which allows the chlorine to dissipate. Chilling the water also makes it taste much fresher.
The “Rotten Egg” Odor
- The Cause: This often points to hydrogen sulfide gas. In apartments, this is frequently linked to a water heater or a buildup of bacteria in the drain. If the smell is only present when running hot water, your water heater’s anode rod may need to be replaced or the tank flushed.
- The Fix: Check if the odor persists in cold water. If it’s only in the hot water, contact your building maintenance to service the heater.
Metallic or Bitter Taste
- The Cause: This is common in older buildings with aging iron, steel, or copper pipes. When water sits in these pipes overnight, it can leach small amounts of metal.
- The Fix: Run the cold water tap for a minute or two (“flushing”) to bring fresh water from the main line into your apartment. If the taste persists, it may be time for a professional water quality assessment.
Earthy or Musty Smell
- The Cause: This often occurs due to “biofilm”—harmless colonies of bacteria and fungi that naturally grow on the inside of plumbing over time. It can also be caused by seasonal changes in reservoir source water (like algae blooms).
- The Fix: Regular flushing of your taps is the best defense. If the taste is persistent, professional testing can confirm if the water chemistry is imbalanced.
3. When to Take Action
While many changes are harmless, some should be taken more seriously:
- Fuel, Gasoline, or Solvent Smells: If your water smells like petroleum or chemicals, stop drinking it immediately. This is rare and could indicate a serious contamination event. Contact the NYC Department of Environmental Protection (DEP) or 311 right away.
- Blue-Green Stains: If your sinks or tubs have blue-green staining accompanied by a metallic taste, it suggests copper pipe corrosion. While small amounts are common, chronic high levels of copper can cause health issues.
- Water That Doesn’t “Clear Up”: If you have flushed your pipes for several minutes and the water remains discolored or has a strong, persistent odor, it is time to look deeper into your building’s plumbing integrity.
Professional Assessment
If your water quality concerns persist, or if you live in a building with aging infrastructure, professional testing is the gold standard for peace of mind. Using accredited lab methods allows you to see exactly what is in your water, distinguishing between harmless mineral fluctuations and potential issues like lead or bacteria.
If you suspect your plumbing is the source of the problem, reach out to our team for a professional evaluation. You can also visit our FAQs for more guidance on navigating NYC water quality.
Are you noticing these tastes or odors at every tap in your home, or is it confined to just one specific faucet?