Chlorine Taste & Odor
What is Chlorine Taste & Odor?
If your tap water smells like a swimming pool, that's the disinfectant working. Utilities add chlorine or chloramine (chlorine combined with ammonia) and keep a small residual in the pipes to stop bacteria from growing on the way to your home. It's essential for safety, but that residual is what you taste and smell.
Health effects
The disinfectant residual itself is regulated as safe to drink: the EPA sets a maximum of 4.0 mg/L for both chlorine and chloramine. The taste and odor are an aesthetic issue rather than a health one. The related health question is about the disinfection byproducts these disinfectants can form, which we cover in a separate guide.
In DC-metro tap water
Nearly every chlorinated municipal supply in the DC metro carries a chlorine or chloramine residual, so the pool-like taste is one of the most common water complaints in the region. It's often strongest right after a utility flushes or adjusts the system.
How to remove it at the tap
Activated carbon removes chlorine taste and odor almost immediately, which is why a carbon filter makes water taste noticeably cleaner. Chloramine is more stubborn than free chlorine, but quality carbon still handles it. A reverse osmosis system includes carbon stages, so it removes the taste and odor along with dissolved contaminants.
Frequently asked
Why does my tap water smell like a pool or bleach?
That's the chlorine or chloramine residual utilities keep in the water to stop bacteria growing in the pipes. It means the disinfection is working; it's just unpleasant to taste and smell.
Is the chlorine in tap water bad for me?
The residual itself is regulated as safe to drink. The health question is really about disinfection byproducts, which form when the disinfectant reacts with organic matter, covered in our chloramines and disinfection-byproducts guide.
How do I get rid of the chlorine taste?
Activated carbon filtration removes it quickly, and a reverse osmosis system (which includes carbon stages) removes the taste and odor along with dissolved contaminants.