Well Water Smells Like Chlorine? Causes & Solutions

Causes of Chlorine Smell

Wells Don't Naturally Have Chlorine

Unlike city water, well water doesn't contain chlorine unless it's been added. If you smell chlorine, it came from somewhere.

Common Sources

1. Recent Shock Chlorination

• Well was disinfected (bacteria treatment)
• New well just drilled
• Pump service/replacement
• Residual chlorine in system

2. Chlorine Injection System

• Installed to treat bacteria or iron bacteria
• Continuous low-level chlorine addition
• May need adjustment if smell is too strong

3. New Plumbing or Fixtures

• Some materials release chemical smell
• New water heater
• Recently replaced pipes
• Usually fades with use

4. Connected to Municipal System?

• Are you actually on city water?
• Some properties have both well and city
• Cross-connection possible

5. Neighbor's Well Chlorination

• If wells are close and aquifers connected
• Rare but possible

After Shock Chlorination

What Is Shock Chlorination?

• High concentration of chlorine added to well
• Kills bacteria throughout system
• Done after positive bacteria test
• Or after well work/new well

How Long Does Smell Last?

• With proper flushing: 1-3 days
• Without flushing: can linger longer
• Depends on how much chlorine used
• Water heater retains chlorine longer

Flushing Procedure

1. Wait required contact time (usually 12-24 hours)
2. Run outdoor faucet/hose away from plants
3. Continue until chlorine smell gone
4. Then run all indoor fixtures
5. Flush water heater last (let sit, then drain)
6. Test residual chlorine if needed

Tips for Faster Clearing

• Use garden hose to remote area
• Run multiple fixtures if well produces enough
• Be patient—several hundred gallons may need flushing
• Don't dump chlorinated water near plants/septic

Chlorine Treatment Systems

Why Install Chlorination?

• Persistent bacteria problems
• Iron bacteria treatment
• Sulfur/hydrogen sulfide treatment
• Required by some regulations

How They Work

• Inject small amount of chlorine into water
• Contact tank allows time to work
• Carbon filter removes chlorine before house

If Smell Is Too Strong

• Check injection rate—may be too high
• Verify carbon filter is working
• Replace carbon media if exhausted
• System may need adjustment

Normal vs Problem

• Slight smell at outdoor spigot (before carbon): normal
• Strong smell inside house: carbon filter issue
• No smell inside: system working correctly

Removing Chlorine Smell

Carbon Filtration

• Most effective for taste/odor removal
• Activated carbon absorbs chlorine
• Point-of-use (under sink) or whole house
• Needs periodic replacement

Filter Options

Letting Water Sit

• Chlorine dissipates over time
• Fill pitcher, let sit uncovered overnight
• Much of chlorine will off-gas
• Simple solution for drinking water

Vitamin C

• Neutralizes chlorine
• Used in shower filters
• Not for drinking water treatment

We use Hach and LaMotte professional water testing equipment for field analysis, with comprehensive lab testing through certified California laboratories.

Frequently Asked Questions

Why does my well water smell like chlorine?

From an added source: recent shock chlorination, chlorine injection system, or new plumbing. Wells don't naturally have chlorine.

How long does chlorine smell last after shocking?

1-3 days with proper flushing. Run all fixtures until smell is gone. Water heater may take longer to clear.

Is chlorine smell in well water harmful?

At normal treatment levels, no. But you shouldn't have chlorine unless you're treating for something. If unexpected, investigate the source.

How do I remove chlorine taste and smell?

Carbon filter is most effective. Whole house for complete treatment, or point-of-use for drinking water. Letting water sit also helps.

My well was just drilled—why does it smell like chlorine?

Drillers disinfect new wells before use. Flush system thoroughly (hundreds of gallons) until smell clears. This is normal.