Tap Water and Contact Lenses: Health Warning Over Dangerous Amoeba Infections
Health officials warn against cleaning contact lenses with tap water after Acanthamoeba infections were linked to vision loss and a fatal brain infection in Louisiana.
Serious Health Warning Issued Over Tap Water and Contact Lens Use
Contact lens wearers are being urged to review their cleaning habits following a health warning about the potential dangers of using tap water on contact lenses.
Health officials in Louisiana have reported a series of infections involving Acanthamoeba, a microscopic organism that can cause serious health complications, including severe eye infections, permanent vision damage and, in rare cases, life-threatening brain infections.
According to the Louisiana Department of Health (LDH), 10 infections have been identified since 2024. Five patients reportedly experienced vision loss, while one person died following a serious brain infection.
The warning highlights the importance of proper contact lens hygiene and the need to avoid exposing lenses and nasal irrigation equipment to untreated tap water.
Although these infections are uncommon, health experts say the consequences can be devastating.
What Is Acanthamoeba and Why Is It Dangerous?
Acanthamoeba is a microscopic amoeba that occurs naturally in the environment. It can be found in freshwater lakes, swimming pools, soil, dust, household plumbing systems and other water sources.
While exposure does not automatically result in illness, certain circumstances can allow the organism to enter the body and cause infection.
One of the most concerning conditions associated with this organism is Acanthamoeba keratitis, a serious infection affecting the cornea, the transparent outer surface of the eye.
The infection can cause significant inflammation and damage to the cornea. Without prompt diagnosis and treatment, it may lead to permanent vision impairment or blindness.
Acanthamoeba can also cause infections affecting the sinuses and central nervous system. One particularly serious condition is granulomatous amoebic encephalitis, which causes inflammation of the brain and can be fatal.
Health officials stress that people with weakened immune systems may face a greater risk of severe infections.
Why You Should Never Clean Contact Lenses With Tap Water
One of the main concerns raised by Louisiana health authorities is the use of ordinary tap water to rinse, clean or store contact lenses.
Many people may assume that household tap water is sufficiently clean for everyday hygiene purposes. However, it can contain microorganisms that are not necessarily eliminated through standard water treatment processes.
Acanthamoeba can survive in certain water environments and may also live within biofilms that develop inside household plumbing systems.
When contaminated water comes into contact with contact lenses, the organism may become trapped between the lens and the surface of the eye.
Contact lenses can create conditions that make it easier for infections to develop, particularly when cleaning and storage instructions are not followed correctly.
For this reason, contact lens wearers should never use tap water as a substitute for commercially approved contact lens cleaning and disinfecting solutions.
The Louisiana Department of Health specifically advises people not to use tap water to clean or store their lenses.
Five Patients Reportedly Experienced Vision Loss
The health warning follows 10 reported Acanthamoeba infections in Louisiana since 2024.
According to the state health department, eight cases involved Acanthamoeba keratitis, which affects the eye's cornea.
Five patients reportedly suffered vision loss as a result of their infections.
Two additional cases identified in 2026 involved infections affecting the sinuses and brain. The brain infection was fatal.
Health officials reported that both patients identified in 2026 had weakened immune systems and used nasal irrigation devices.
Additionally, seven of the 10 individuals identified since 2024 were contact lens wearers.
State epidemiologist Theresa Sokol emphasised that although these infections are rare, their consequences can be severe.
She highlighted the importance of using appropriate water for nasal rinsing, maintaining proper contact lens hygiene and taking precautions when using medical devices.
Importantly, the health department has not established that tap water was definitively responsible for every reported infection. However, the cases reinforce the importance of following established water safety recommendations.
Symptoms of Acanthamoeba Keratitis You Should Never Ignore
Recognising the early warning signs of an eye infection is important, particularly for people who regularly wear contact lenses.
Acanthamoeba keratitis can initially resemble other common eye conditions, making it difficult to identify without a professional examination.
Potential symptoms include:
- Severe or persistent eye pain.
- Redness and irritation.
- Blurred or reduced vision.
- Sensitivity to bright lights.
- A sensation that something is trapped inside the eye.
- Excessive tearing.
- Increasing discomfort when wearing contact lenses.
Symptoms may develop gradually and can become more serious if treatment is delayed.
Anyone experiencing unusual eye pain, redness or changes in vision should remove their contact lenses and seek urgent advice from an eye care professional.
Do not attempt to treat a suspected infection using ordinary eye drops without professional guidance.
How to Protect Your Eyes When Wearing Contact Lenses
Maintaining good contact lens hygiene is one of the most effective ways to reduce the risk of preventable eye infections.
Health authorities recommend several important precautions.
1. Always use approved contact lens solution
Use the cleaning and disinfecting solution recommended for your specific lenses. Never substitute tap water, bottled water or homemade saline solutions.
2. Never rinse lenses with tap water
Even if water appears clean, it may contain microorganisms capable of causing infections.
3. Avoid wearing contact lenses while swimming
Lakes, swimming pools and hot tubs can contain microorganisms that may contaminate contact lenses.
4. Remove lenses before showering
Showering while wearing contact lenses can expose your eyes to waterborne microorganisms. Remove your lenses before getting into the shower.
5. Clean and replace your lens case regularly
Follow the manufacturer's cleaning instructions and replace your contact lens case at the recommended intervals.
6. Follow your replacement schedule
Never wear disposable contact lenses for longer than recommended. Avoid sleeping in lenses unless your eye care professional has specifically advised that your lens type is suitable for overnight wear.
7. Wash and dry your hands before handling lenses
Clean hands help reduce the transfer of bacteria and other microorganisms when inserting or removing contact lenses.
Is Tap Water Safe for Nasal Rinsing?
The Louisiana Department of Health has also warned people against using untreated tap water in nasal irrigation devices.
Neti pots and other nasal rinsing equipment are commonly used to relieve congestion and clear nasal passages. However, using unsafe water in these devices can introduce harmful microorganisms into the nasal cavity.
For nasal rinsing, health authorities recommend using distilled or sterile water, or water that has been boiled and allowed to cool according to established safety guidance.
The distinction is important: water that is suitable for drinking is not automatically suitable for nasal irrigation or contact lens cleaning.
The health department also advises people with weakened immune systems to be particularly careful when using medical devices and water-based hygiene products.
When Should You Seek Medical Attention?
Although Acanthamoeba infections are rare, certain symptoms require immediate medical attention.
People with weakened immune systems should be especially alert to unusual or worsening symptoms.
These may include severe headaches, confusion, seizures, weakness, fever, sinus problems, visual disturbances or unexplained skin changes.
Anyone experiencing these symptoms should seek urgent medical assessment.
Contact lens wearers should also arrange prompt professional evaluation if they develop severe eye pain, redness, light sensitivity or blurred vision.
Early diagnosis and appropriate treatment can be important in reducing the risk of serious complications.
Final Thoughts
The Louisiana health warning is an important reminder that seemingly harmless everyday habits can sometimes carry unexpected health risks.
Using tap water to rinse or store contact lenses may expose the eyes to microorganisms such as Acanthamoeba, which can cause serious infections and potentially permanent vision damage.
The safest approach is simple: use approved contact lens solutions, keep lenses away from water, follow proper hygiene instructions and seek professional advice if unusual symptoms develop.
Protecting your eyesight starts with understanding the risks and making small but important changes to your daily routine.
Sources and References
- Louisiana Department of Health (LDH): State health advisory and public health information concerning Acanthamoeba infections, contact lens hygiene and safe water practices.
- Centers for Disease Control and Prevention (CDC): Acanthamoeba Infection.
- Centers for Disease Control and Prevention (CDC): Preventing Acanthamoeba Keratitis.
- Centers for Disease Control and Prevention (CDC): About Contact Lenses.
- Original news report: Daily Mail, October 30, 2026, reporting on the Louisiana Department of Health warning.
Medical Disclaimer
This article is intended for general informational and educational purposes only. It does not constitute medical advice, diagnosis or treatment. The information provided should not replace consultation with a qualified healthcare professional, ophthalmologist or optometrist. If you experience eye pain, redness, blurred vision or other concerning symptoms, seek professional medical attention promptly. Always follow the instructions provided by your eye care professional and the manufacturer of your contact lenses and cleaning solutions.