Not all disinfectants are created equal — and marketing language like 'kills 99.9% of germs' can be misleading without understanding what's actually been tested and registered. The EPA's registration process for antimicrobial products is the standard that determines whether a disinfectant actually does what it claims. This guide explains how the registration system works and how facility managers can verify that their cleaning company is using properly registered products.
How EPA Disinfectant Registration Works
Before a disinfectant can be sold in the United States, the manufacturer must submit efficacy data to the EPA demonstrating that the product kills specific organisms under specific conditions. The EPA reviews this data and, if satisfied, assigns a registration number (EPA Reg. No.) that appears on the product label. This number is your guarantee that the product's claims have been independently verified. Products without EPA registration numbers are not legally disinfectants — they're cleaners. The distinction matters enormously in healthcare, childcare, food service, and any regulated environment.
Understanding EPA Lists (N, K, and Others)
The EPA maintains several lists of registered products organized by target organisms. List N identifies products effective against SARS-CoV-2 and other emerging viral pathogens — this list was created during the COVID-19 pandemic and remains relevant for respiratory virus season protocols. List K covers products effective against Clostridioides difficile (C. diff) spores, which are among the hardest organisms to kill and are particularly relevant in healthcare settings. List G covers products effective against norovirus and other gastrointestinal pathogens — critical for schools and food service environments. When selecting disinfectants, start with the organisms you need to target, then verify that your products appear on the appropriate EPA list.
What 'Hospital-Grade' Actually Means
The term 'hospital-grade disinfectant' has a specific EPA definition: a product registered as effective against Staphylococcus aureus (a Gram-positive bacterium), Salmonella choleraesuis (a Gram-negative bacterium), and Pseudomonas aeruginosa (a particularly resistant Gram-negative bacterium). Passing efficacy testing against all three organisms earns the hospital-grade designation. However, hospital-grade registration alone doesn't mean a product is effective against viruses, fungi, or bacterial spores. A hospital-grade disinfectant may not kill norovirus, C. diff, or tuberculosis unless separately tested and registered for those organisms. Always verify the specific claim needed for your facility rather than relying on the hospital-grade label alone.
Dwell Time: The Most Ignored Factor
Every EPA-registered disinfectant has a specified dwell time (also called contact time or wet contact time) — the duration the product must remain wet on the surface to achieve its registered kill claims. Dwell times range from 30 seconds to 10 minutes depending on the product and target organism. The critical point: if a cleaning staff member sprays a disinfectant and wipes it off after 15 seconds, and the required dwell time is 5 minutes, the surface has not been disinfected regardless of how potent the product is. Dwell time compliance is the single most common failure point in disinfection programs. Ask your cleaning company how they ensure dwell time compliance — if they don't have a specific answer, their disinfection protocols are likely ineffective.
How to Verify Product Claims
Facility managers can verify any disinfectant's EPA registration and claims using the EPA's Pesticide Product and Label System (PPLS) at epa.gov. Search by registration number or product name to access the approved product label, which lists every organism the product is registered to kill and the required dwell time for each claim. If your cleaning company can't provide the EPA registration numbers of the disinfectants they use in your facility, this is a significant red flag — they may be using unregistered products or consumer-grade products that don't meet commercial facility requirements.
GreenPoint uses EPA-registered, hospital-grade disinfectants across all facilities, with product selection matched to facility type and risk profile. Every product's EPA registration number, target organisms, and required dwell times are documented in your facility's cleaning specification. We can provide this information on request — because transparency in product selection is a baseline expectation, not a special request.