Bad tap water smell typically comes from chlorine, chloramine, sulfur bacteria, or organic compounds in the water supply. In Newhall, California, most odor problems trace back to municipal disinfection chemicals or seasonal shifts in water chemistry that allow bacteria or algae to grow in pipes or distribution lines.
I'm Eli, a Certified Water Specialist with over 20 years of hands-on experience installing and servicing residential and commercial water treatment systems across the United States.
What Causes Tap Water to Smell Bad
Chlorine is the most common culprit. Newhall receives treated municipal water, and chlorine or chloramine is used to kill bacteria during distribution. When chlorine levels spike, especially in warmer months, the smell becomes sharp and pool-like. Some people notice it immediately at the tap, others only after the water sits in a glass. Chloramine, a combination of chlorine and ammonia, produces a similar odor but lingers longer because it's more stable in the pipes. I see this frequently in homes near the end of long distribution lines where contact time is higher.
Sulfur bacteria can also cause odor, even in city water. If you smell rotten eggs, that's hydrogen sulfide gas. It forms when sulfur-reducing bacteria grow in water heaters, well casings, or stagnant sections of plumbing. The gas is released when you turn on the hot tap. Sometimes it's only the hot side that smells, which tells me the issue is localized in the tank, not the supply line.
When the Smell Comes From Your Plumbing
Not all odor originates at the source. I've responded to calls in Newhall where homeowners were convinced their water supply had changed, but the real issue was biofilm buildup inside their home's pipes. Old galvanized steel or sections of PEX that don't get regular flow can harbor bacteria that produce musty, earthy, or metallic smells. If the odor only happens at one faucet or after the water sits overnight, the problem is likely inside your house, not the municipal system.
Newer homes sometimes smell like plastic or glue. That's usually temporary and fades as the plumbing cures, but if it persists, it may indicate a reaction between your water chemistry and the pipe material. I don't treat that as a contamination issue, but it's worth testing pH and chlorine levels to see if something is accelerating breakdown.
How to Identify the Source of the Odor
Start by isolating where the smell occurs. Run cold water at the kitchen sink for 30 seconds, then fill a clean glass and step outside. If the smell is still strong outdoors, it's in the water. If it fades, the odor may be coming from your drain or disposal. Next, test hot versus cold. If only hot water smells, check your water heater. Bacteria thrive in tanks set below 120°F, and flushing the tank or raising the temperature can sometimes solve it.
If both hot and cold smell the same and it happens at every tap, you're dealing with a supply issue. In that case, I recommend collecting a sample and having it tested for chlorine, chloramine, sulfur, iron bacteria, and total dissolved solids. A basic water test will show whether treatment is needed or if the odor is cosmetic.
What Actually Removes Odor From Tap Water
For chlorine and chloramine odor in Newhall homes, catalytic carbon filtration works well. Systems like the AquaProTec™ Ultra 64K Catalytic Carbon Filter are designed to reduce both compounds at the point of entry, so every tap in the house benefits. Carbon filters also improve taste and remove some organic chemicals that contribute to musty or swampy smells.
If the odor is sulfur-based and bacterial in origin, oxidation is usually required. The OZONEX™ Ozone Generator Oxidizing System uses ozone to kill bacteria and oxidize sulfur compounds without adding chemicals. It's effective for rotten egg odor and also addresses iron bacteria, which can cause slime and staining in addition to smell.
Reverse osmosis handles odor at the drinking water level but won't treat the whole house. If your main concern is cooking and drinking water, an under-sink RO system will remove chlorine, chloramine, and most dissolved contaminants. You can explore options through AQUALIVIA's reverse osmosis systems page, which covers capacity and installation details.
What Doesn't Work
Letting water sit in a pitcher won't remove chloramine. It may reduce free chlorine slightly, but chloramine is bonded and requires catalytic carbon or chemical reduction to break down. I've also seen homeowners try boiling water to remove odor. That can drive off some volatile compounds, but it concentrates minerals and doesn't address bacteria or disinfection byproducts. If you're boiling water because it smells, you need a filtration system, not a workaround.
Water softeners don't treat odor. They remove hardness minerals like calcium and magnesium, but they won't reduce chlorine, sulfur, or organic taste. In fact, if your softener isn't maintained properly, it can become a source of odor if bacteria grow in the resin tank. I've pulled apart more than a few neglected units that smelled worse than the water going in.
When to Take Action
If the odor is sudden and strong, contact your water provider first. They may have adjusted treatment levels or experienced a line break that stirred up sediment. If the odor is consistent and affects your daily life, it's worth testing and treating. Odor isn't always a health risk, but it's a quality-of-life issue, and in some cases it signals the presence of bacteria or chemical imbalance that should be addressed. For Newhall homeowners dealing with city water odor, a whole-house carbon filter or ozone system usually solves the problem long-term. You can compare treatment options through AQUALIVIA's city water filtration systems page.
For broader category context, I would also review Commercial Ozone Water Treatment Systems for Businesses and Best-Selling Water Treatment Systems for Homes & Businesses.
Frequently Asked Questions
Why does my tap water smell like chlorine in Newhall, California?
Chlorine is added by the municipal water system to disinfect the supply. Odor intensity can increase during warmer months or after maintenance work on distribution lines. A catalytic carbon filter reduces chlorine odor throughout the home.
Can bad-smelling water make you sick?
Most odor is cosmetic and not a direct health threat, but it can indicate bacteria, high chlorine, or organic contamination. If the smell is sudden or accompanied by discoloration, have your water tested before drinking it.
What causes a rotten egg smell in tap water?
Rotten egg odor comes from hydrogen sulfide gas, usually produced by sulfur bacteria in your water heater or plumbing. Ozone treatment or shock chlorination can eliminate the bacteria and remove the smell.
Will a water softener remove tap water odor?
No. Water softeners remove hardness minerals but do not treat chlorine, sulfur, or organic odors. You need a carbon filter or oxidation system to address smell issues effectively.
How do I know if the odor is from my pipes or the water supply?
Run cold water for 30 seconds, fill a glass, and smell it outside. If the odor persists outdoors, it's in the water. If it fades, the issue is likely your drain or plumbing.