Turning on the tap and being greeted by an unpleasant odor is more than just annoying—it can be a sign of underlying plumbing or water quality issues that need immediate attention. Whether your water smells like metal, rotten eggs, or a damp basement, each odor tells a different story about what’s happening inside your pipes, water heater, or supply system.
Our Long Beach Plumbing experts recommend identifying the source of the smell quickly to prevent health concerns, protect your plumbing, and restore fresh, clean water to your home. At A1 Best Plumbing, we’ve diagnosed thousands of water odor issues across Long Beach and beyond. This guide breaks down the most common causes and solutions for smelly water.
Table of Contents
- Why Water Odor Matters
- Why Does Water Smell Metallic?
- Why Does Water Smell Like Sulfur or Rotten Eggs?
- Why Does Water Smell Musty or Earthy?
- Is Smelly Water Safe to Drink?
- How to Diagnose the Source of the Smell
- Solutions for Smelly Water
- When to Call a Professional Plumber
- Preventing Future Water Odor Issues
- Key Takeaways
Key Takeaways
- Metallic-smelling water is typically caused by elevated levels of iron, manganese, copper, or corroding pipes.
- Sulfur or rotten egg odors usually indicate hydrogen sulfide gas, often from water heaters or bacterial activity.
- Musty smells are commonly linked to bacteria, algae, or decaying organic matter in the water supply or plumbing system.
- Testing hot vs. cold water separately helps identify whether the issue is in your water heater or main supply.
- Our Long Beach Plumbing experts recommend professional water testing to accurately diagnose the cause and recommend the right solution.
- Most smelly water issues are treatable with filtration systems, water heater maintenance, or pipe replacement.
Why Water Odor Matters
Clean water should be odorless and colorless. When your water develops a distinct smell, it’s often a sign of chemical imbalances, bacterial growth, or plumbing deterioration. While some odors are harmless, others may indicate contamination that affects both your health and your home’s plumbing infrastructure.
Our Long Beach Plumbing experts recommend never ignoring changes in water odor—early detection can save thousands in repairs and safeguard your family’s well-being.
Why Does Water Smell Metallic?
A metallic or “blood-like” smell in your water is usually caused by elevated concentrations of metals. Common culprits include:
- Iron: Naturally occurring in groundwater, iron gives water a metallic taste and rusty appearance.
- Manganese: Often paired with iron, manganese can cause a bitter, metallic flavor and dark staining.
- Copper: Leached from corroding copper pipes, especially in older homes with acidic water.
- Zinc: Released from corroding galvanized steel pipes.
- Lead: A serious health hazard often found in homes with pre-1986 plumbing.
If the metallic smell is stronger from hot water, the issue may be with your water heater. If it comes from both hot and cold taps, the source is likely in your supply lines or municipal water.
Our Long Beach Plumbing experts recommend immediate lead testing for any home built before 1986, as lead exposure poses serious health risks—particularly for children and pregnant women.
Why Does Water Smell Like Sulfur or Rotten Eggs?
The unmistakable rotten egg odor is caused by hydrogen sulfide gas. Common sources include:
- Bacteria in the water heater: Sulfate-reducing bacteria thrive in warm environments and react with the magnesium or aluminum anode rod, producing hydrogen sulfide.
- Well water contamination: Naturally occurring sulfur bacteria in groundwater.
- Decaying organic matter: In drains or supply lines.
- Sewer gas leaks: A blocked or damaged plumbing vent can allow sewer gas into the home.
To diagnose:
- If only hot water smells like sulfur, the water heater is the likely source.
- If both hot and cold water smell, the issue is in the main water supply.
- If the smell is strongest near drains, the odor is likely coming from bacteria in the drain trap—not the water itself.
Our Long Beach Plumbing experts recommend flushing your water heater and replacing the anode rod with an aluminum-zinc alternative if bacteria are the cause. For sewer gas leaks, a professional inspection is essential.
Why Does Water Smell Musty or Earthy?
Musty, earthy, or moldy-smelling water usually points to organic contamination. Possible causes include:
- Algae or bacteria in the water source: Common in municipal supplies during warm months.
- Bacterial growth in drains: Buildup of soap scum, hair, and organic matter can produce musty odors that mimic water smells.
- Contaminated well water: Surface water infiltration can introduce organic material.
- Aging pipes: Biofilm buildup inside pipes can release musty odors over time.
If the smell disappears after running the tap for a few minutes, the issue is likely in your home’s plumbing. If it persists, the problem may originate from the water source itself.Our Long Beach Plumbing experts recommend cleaning drains thoroughly and installing a whole-home carbon filtration system to remove organic compounds that cause musty odors.
Is Smelly Water Safe to Drink?
Not all smelly water is unsafe, but some odors do indicate real health risks:
- Metallic smells from lead or copper can be harmful, especially with long-term exposure.
- Sulfur odors are usually harmless in small amounts but can indicate bacterial contamination.
- Musty smells may signal bacterial growth or contamination that requires testing.
Our Long Beach Plumbing experts recommend avoiding consumption of smelly water until you’ve identified the source and confirmed its safety through professional testing.
How to Diagnose the Source of the Smell
Follow these steps to narrow down the cause:
- Test hot and cold water separately at multiple faucets.
- Fill a glass and step away from the sink—if the smell dissipates, it’s likely from the drain, not the water.
- Check if the smell affects the whole house or just one fixture.
- Note when the smell started—recent changes may correlate with plumbing repairs or municipal work.
- Test water from an outdoor spigot to bypass indoor plumbing and isolate the source.
Solutions for Smelly Water
Depending on the diagnosis, common solutions include:
- Water heater flushing and anode rod replacement for sulfur odors.
- Whole-home water filtration systems (carbon, reverse osmosis, or iron filters).
- Pipe replacement for corroded galvanized, copper, or lead lines.
- Water softeners to reduce mineral content.
- Drain cleaning and disinfection for musty odors from biofilm buildup.
- Shock chlorination for well water contamination.
Our Long Beach Plumbing experts recommend starting with a professional water quality test to determine the exact contaminants before investing in treatment equipment.
When to Call a Professional Plumber
Contact A1 Best Plumbing immediately if you notice:
- Persistent odors that don’t improve with basic troubleshooting
- Discolored or cloudy water accompanying the smell
- Sewer gas odors indoors
- Any suspicion of lead contamination
- Odors combined with low water pressure or leaks
Preventing Future Water Odor Issues
Regular plumbing maintenance goes a long way in preventing smelly water. Our Long Beach Plumbing experts recommend:
- Flushing your water heater annually
- Replacing anode rods every 3-5 years
- Cleaning drains monthly with enzyme-based cleaners
- Installing and maintaining whole-home filtration systems
- Scheduling annual plumbing inspections
- Testing water quality every 1-2 years
Final Thoughts
Smelly water isn’t just unpleasant—it’s often a warning sign that something in your plumbing or water supply needs attention. Whether the odor is metallic, sulfur-like, or musty, identifying the root cause is the first step toward restoring clean, safe water in your home.Our Long Beach Plumbing experts recommend scheduling a professional water quality inspection with A1 Best Plumbing to diagnose and resolve any water odor issues quickly and effectively.
Our licensed technicians use advanced testing methods and proven treatment solutions to help Long Beach homeowners enjoy fresh, odor-free water.Contact A1 Best Plumbing today to schedule your water quality assessment and take the first step toward cleaner, better-smelling water.