Ozone Water Treatment For Well Water: The 6 Things You Need to Know First

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#1: Ozone Is a Powerful Disinfectant

Ozone water treatment can rapidly disinfect your well water and kill bacteria and viruses, but unlike chlorine, it doesn’t leave a chemical chlorine residual.

#2: When Used With Filtration, It Removes Iron, Manganese, and Sulfur Odor

When combined with filtration, the oxidizing properties of ozone eliminate iron, manganese, and sulfur, reducing or eliminating taste and odor problems.

#3: Ozone Is Automatic and Doesn’t Require Additional Chemicals

Ozone is a gas generated by an ozone generator at your site and injected into your water.

#4: Sizing Is Critical

Ozone generators need to be sized to fit the application. They produce ozone in grams per hour, depending on your well water flow rate and chemistry.

#5: Decide on Ultraviolet (“UV”) Light Ozone Water Treatment or Corona-Discharge Type

While UV light can produce low levels of ozone, it’s most effective for removing slight odors and shouldn’t be used for disinfection. Corona discharge uses electricity inside a ceramic or glass cell or stainless steel plate chamber to produce ozone. It works better with dry air, and cartridges are available that produce dry air to help the generator produce higher levels of ozone.

#6: Inject Ozone Under Pressure for Best Results

You can bubble ozone into water in open storage tanks or low-pressure vessels, but most of the ozone won’t transfer into the water that way. For optimum transfer, it’s much better to draw the ozone in with a venturi into a contact tank under 40-50 PSI of pressure.

Ozone Systems Are Widely Used for Bottling Water and Water Purification Worldwide

Ozone has been used for over 100 years to treat water for cities, bottling water plants, and other commercial and industrial processes. Home systems have been available for some years and have improved in quality and design.

If you have iron, manganese, odor, and bacteria, ozone combined with proper filtration can work great and last for many years.

Ozone is much faster at killing bacteria and oxidizing iron and manganese compared to chlorine or peroxide. One advantage for home use is that ozone is quite unstable and degrades over a time frame ranging from a few seconds to 30 minutes.

So If Ozone Is So Great, Why Doesn’t Everyone Use It?

Ozone water treatment is quite expensive compared to chlorination. It costs much more upfront than aeration, chlorine injection, or hydrogen peroxide injection, that’s the primary disadvantage. Shop our ozone systems.

Ozone vs. Chlorine: Why Ozone Works Faster

Ozone can disinfect water of bacteria and viruses more effectively than chlorine. To disinfect water with either one, there must be enough residual concentration in mg/L (parts per million, or PPM), and enough contact time, measured in minutes, for disinfection to occur. Water chemistry matters too, the pH, turbidity, and other contaminants all affect how well chlorine or ozone disinfects your well water.

For example, the CT value (concentration of oxidizer multiplied by time in minutes) for disinfecting viruses with chlorine is 6, meaning 6 minutes at 1 PPM chlorine concentration. For ozone, the CT value is less than 1: one PPM with just 1 minute of contact time achieves disinfection and oxidation faster than chlorine or peroxide. This varies with water temperature and pH, but it shows why ozone systems can use smaller contact tanks and equipment for the same result.

Want to know what ozone should never be used on? See our guide on 7 things you must never ozone.

Bubbling Ozone Gas Into the Water vs. Injection by Venturi Under Pressure

Ozone is a gas, so how does it get transferred into water, which is a liquid?

Ozone has been used to treat water since the 1890s. For roughly the first 75 years, the most common method was bubbling it into a column of water, usually into the bottom of a tall (20 to 30 feet high) non-pressurized water column through a bubbler diffuser, ceramic stone, or pipes with holes drilled into them.

Studies have shown that mass transfer of ozone into a column or tank of water 20 feet high or shorter is no more than 10%. That means 90% of the ozone produced is wasted and has to be vented off.

Ozone bubbler systems are still common in well water storage tanks today, and you can often smell ozone gas around these setups. It’s tempting to think “the ozone is working great, I can smell it,” but that smell is actually a sign of poor design.

For proper disinfection and oxidation, use a venturi to draw the ozone gas in under pressure into a contact tank, ideally around 30-50 PSI.

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Frequently Asked Questions (FAQs)

1. What does ozone do in well water treatment?

Ozone acts as a powerful oxidizer and disinfectant, helping to remove bacteria, viruses, iron, manganese, and sulfur odors from well water with proper filtration.

2. Is ozone water treatment safe?

Yes. Ozone is generated on-site and breaks down quickly into oxygen, leaving no harmful chemical residues behind. When used correctly, it’s safe for household water systems.

3. Does ozone remove sulfur smells from water?

Absolutely. Ozone is highly effective at oxidizing hydrogen sulfide gas (H₂S), which causes the rotten-egg odor in well water, especially when paired with catalytic carbon filtration.

4. How does ozone compare to chlorine?

Ozone works faster than chlorine, requires less contact time, and doesn’t leave a chemical taste. However, ozone systems cost more upfront and don’t leave a residual disinfectant in the water.

5. Can ozone remove iron and manganese from well water?

Yes. Ozone oxidizes dissolved iron and manganese into solid particles that can be easily filtered out using media like manganese dioxide or catalytic carbon.

6. What kind of maintenance do ozone systems need?

For optimal performance, ozone generators typically require routine cleaning, air dryer cartridge replacement, and periodic inspections of tubing, injectors, and filters.

7. Do I need a contact tank for ozone to work?

Yes, for maximum efficiency. Injecting ozone under pressure into a contact tank allows for better gas transfer and enough reaction time for disinfection and oxidation.

8. Can ozone kill bacteria in well water?

Yes. Ozone is a fast-acting disinfectant that quickly kills most bacteria and viruses, making it an excellent alternative to chlorine, especially in systems without chemical residuals.

9. Why do some ozone systems smell like ozone gas?

If you can smell ozone around the system, it’s likely inefficiently transferring ozone into the water (common with bubbler-style systems). Properly designed systems inject ozone under pressure to reduce waste and odor.

10. Is ozone treatment worth the cost?

While ozone systems have a higher upfront cost than chlorination or aeration, they provide chemical-free treatment, faster disinfection, and improved water quality, making them a smart long-term investment for many well owners.

Read More

• • 7 Things You Must Never Ozone
  • Well Water: No Water or Low Pressure? Here’s the Fix

Resources

• • EPA: Overview of Drinking Water Treatment Technologies, federal overview of treatment methods including ozone.
  • UMass Amherst CAFE: Ozone Treatment of Drinking Water Supplies, a detailed look at ozone’s benefits and drawbacks, including its lack of residual disinfection.
  • eXtension: Drinking Water Treatment – Ozone, covers safety considerations, corrosion risk, and system maintenance.
  • Alabama Cooperative Extension: Treatment Options for Water Well Owners, compares ozone against chlorination, UV, and other disinfection methods.

See how we make clean water simple, with proven systems, easy installation, and a 90-day guarantee. Whether your well or city water smells off or leaves stubborn stains, you don’t have to face it alone. The same goes if it’s damaging your appliances.

Article last updated by Author August, 2026.