Is reverse osmosis safe during a boil order?
When a boil water notice is issued in Houston, many homeowners with reverse osmosis systems ask the same question:
Can I safely use my reverse osmosis (RO) system during a boil order?
The answer depends on understanding what boil orders address, what RO systems are designed to remove, and why cities still issue blanket guidance.
What a boil order is designed to protect against:
Boil water notices are issued when there is a potential risk of microbial contamination, such as:
Bacteria
Viruses
Parasites
These risks usually arise from pressure loss, infrastructure damage, or treatment disruption — not chemical contamination.
Boiling water is effective because it kills microorganisms.
What reverse osmosis systems remove:
Reverse osmosis systems are designed to remove:
Dissolved solids
Chloramines
Metals
Nitrates
PFAS and other chemicals
Many RO membranes are also capable of removing microorganisms due to their extremely small pore size. However, most residential RO systems are not certified as primary disinfection devices.
This distinction matters during a boil order.
Why cities still recommend boiling:
Even if an RO system is functioning properly, cities recommend boiling because:
They cannot verify the condition of every home system
Not all systems are maintained equally
Certification standards differ by system design
For this reason, public guidance is conservative and applies to all households.
What many Houston homeowners choose to do:
During boil orders, homeowners often:
Use bottled water for drinking and formula
Boil tap water as instructed
Continue using RO water for added peace of mind, while still following city guidance
RO systems provide an extra layer of protection, but they do not officially replace boil instructions unless specifically certified for microbial disinfection.
Why boil orders prompt homeowners to upgrade:
Boil notices highlight how quickly access to reliable drinking water can change. Many homeowners decide to install or upgrade RO systems afterward to improve:
Daily drinking water quality
Confidence during disruptions
Long-term control over water purity
Just a few reasons why customers choose Environmental ProTech
PS. We have over 30 years experience in bringing clean water to the Houston Homeowners. Our reviews speak for themselves! If you want clean drinking water from your faucet, contact us at 281-495-4420 to schedule your free water test today.
Sources
U.S. Environmental Protection Agency – Boil Water Advisories
https://www.epa.gov/ground-water-and-drinking-water/emergency-response-drinking-waterCenters for Disease Control and Prevention – Drinking Water Emergencies
https://www.cdc.gov/healthywater/emergency