Water filters are typically not eligible for reimbursement with a Flexible Spending Account (FSA) or Health Savings Account (HSA). In limited cases, a water filtration system may qualify if prescribed by a physician to treat a diagnosed medical condition and supported by a Letter of Medical Necessity (LMN).
Why Are Water Filters Not FSA/HSA Eligible?
Most water filters are considered household improvement or general health products rather than medical equipment. Under IRS Code Section 213(d), eligible medical expenses must be primarily for the diagnosis, treatment, or prevention of disease—not for general wellness or improved drinking water quality.
According to IRS Publication 502, capital improvements to a home are only eligible when they are made primarily for medical care. Because water filters are commonly purchased for taste, convenience, or general health purposes, they are typically not reimbursable.
What’s Not Covered?
Pitcher-style or faucet-mounted water filters
Whole-house filtration systems
Reverse osmosis systems purchased for general use
Replacement filters and cartridges
Water softeners or purification devices for convenience or home improvement
LMN and Exceptions
In rare situations, a water filtration system may qualify if it is medically necessary to treat a diagnosed medical condition.
Examples may include:
Severe immune system disorders requiring highly purified water
Specific allergy or environmental sensitivity diagnosed by a physician
Medical conditions requiring contaminant-free water as part of treatment
To pursue reimbursement:
Obtain a physician’s diagnosis specifying the medical condition.
Request a detailed Letter of Medical Necessity (LMN) explaining why a water filtration system is required.
Confirm eligibility with your FSA/HSA administrator before purchase.
Retain all receipts, installation documentation, and the LMN for submission.
If installed in a home, reimbursement is generally limited to the portion of the expense that does not increase the home’s value, and documentation may be required to support that determination.
Most water filters purchased for general health, taste improvement, or lifestyle reasons remain ineligible for FSA or HSA reimbursement.
