Summary
Food safety professors Ben Chapman (North Carolina State University) and Don Chapman (Rutgers University) tackle the question of whether using a neti pot with tap water is risky. Prompted by a CDC paper in Emerging Infectious Diseases documenting 10 cases of acanthamoeba infection linked to nasal rinsing over nearly 30 years, they break down the actual risk level for everyday users. The hosts explain that all documented cases involved immunocompromised patients, and the CDC itself does not discourage nasal irrigation for the general population. They review Mayo Clinic guidelines recommending distilled, sterilized, or boiled water and note that the CDC paper's own limitations include the inability to definitively confirm nasal rinsing as the transmission route. Both professors conclude the practice is not risky for healthy adults who follow basic water safety precautions, but strongly caution immunocompromised individuals to use only sterilized water.
Key Points
- A CDC paper documented only 10 acanthamoeba infections linked to nasal rinsing over a nearly 30-year period in the United States
- All 10 documented patients were immunocompromised, and the infection carries an 82% fatality rate
- The CDC does not discourage nasal irrigation generally but recommends safe water practices for immunocompromised persons
- Mayo Clinic guidelines recommend distilled, sterilized, or boiled water for neti pot use
- Tap water can be made safe by boiling for at least one minute (three minutes above 1980 meters elevation)
- Water filters with one micron or smaller pore size are also acceptable alternatives
- Both professors rate neti pot use with tap water as "not risky" for healthy adults, with a caveat for immunocompromised users
- The CDC paper acknowledges causation cannot be determined and nasal rinsing was not definitively confirmed as the transmission route
Key Moments
CDC study on acanthamoeba infections from nasal rinsing
The hosts discuss an Ars Technica article about a CDC paper documenting 10 cases of acanthamoeba infection linked to nasal rinsing over a nearly 30-year period. All patients were immunocompromised, and the infection carries an 82% fatality rate.
"The headline is death by neti pot. Why you shouldn't use tap water to clean your sinuses. And it was related to a paper in emerging infectious diseases."
Mayo Clinic guidance on safe neti pot water preparation
Prof. Chapman reads Mayo Clinic guidelines recommending distilled or sterilized water for neti pot use, with tap water boiled for several minutes as an alternative. Filters with one micron or smaller pore size are also acceptable.
"To start, use water labeled as distilled or sterilized. To use tap water, boil it for several minutes and let it cool until it's only slightly warm, called lukewarm."
Verdict on neti pot tap water safety for healthy adults
Both food safety professors conclude that using a neti pot with tap water is not risky for healthy adults, but carries meaningful risk for immunocompromised individuals. They note the CDC paper itself does not discourage nasal irrigation generally, only recommending safe water practices.
"We can both definitively say using a neti pot if you are immunocompromised where you don't have some sort of sanitation or sterilization step is most definitely risky."
