The One Certification Every Macerator Must Have And How to Check If Yours Has It

If you've been researching macerating toilets, you've probably come across the string "ASME A112.3.4/CSA B45.9" on a product page or a plumbing code reference. It looks like regulatory fine print. It isn't. It's the single most important thing to check when buying a macerating toilet in the United States — and most cheap imports fail it completely.

What the Standard Is
ASME A112.3.4/CSA B45.9 is the joint North American product standard for macerating toilet systems and waste-pumping systems. It is published by two organizations:
ASME — the American Society of Mechanical Engineers, one of the most respected engineering standards bodies in the world
CSA Group — a testing and certification organization recognized by OSHA as a Nationally Recognized Testing Laboratory (NRTL)

The standard specifies requirements for materials, construction, performance, testing, and markings for any system designed to collect, grind, and pump waste from a toilet, lavatory, shower, or bathtub to the main drainage system. A product that has been certified to this standard has been pulled apart, stress-tested, and verified by an independent lab, not declared compliant by the brand selling it.

What It Actually Tests
Earning this certification is not a paperwork exercise. It requires independent, third-party testing across five areas:
 

• Materials Certified material grades are required for all components in contact with
  wastewater or electrical systems. This level of material scrutiny alone disqualifies
  many budget imports, which are produced with lower-grade components that would
  not pass independent review.
• Construction The housing, motor assembly, blade system, and seals must
  withstand defined stress tests, ensuring the product holds up under real-world
  conditions, not just a controlled factory demonstration.
• Performance Pump capacity, grinding efficiency, maximum vertical discharge
  height, and flow rates are all tested against minimum thresholds. A product can't just
  move water — it must do so reliably, at volume, over the distances real installations
  require.
• Independent Testing All testing must be conducted by an accredited third-party
  laboratory — not self-certified by the manufacturer. This is the critical distinction
  between a genuine certification and a marketing claim.
• Markings The certified product must display the certification mark on the product
  itself so field inspectors can verify compliance at the installation site.

The Two Marks That Matter in the U.S.
The CSA Mark (CSA Group) Issued by CSA Group, accredited by OSHA as a Nationally Recognized Testing Laboratory. A product bearing the CSA mark with "US" or "C+US" indicators is certified for both U.S. and Canadian markets and is recognized under both the International Plumbing Code (IPC) and Uniform Plumbing Code (UPC) jurisdictions. The CSA mark is the most universally applicable
certification for macerating products in North America — covering the broadest range of products across the category. The mark must be physically present on the product housing — not just on the box or website.

The cUPC Mark (IAPMO R&T) Issued by IAPMO R&T, the testing arm of the International Association of Plumbing and Mechanical Officials, which has been certifying plumbing products since the 1940s. The cUPC mark is recognized by building officials across all UPC and IPC states. Note that not all certified products carry this mark — CSA certification is the broader and more universal benchmark.
The mark must be physically present on the product housing.

Why Most Cheap Imports Don't Have Either
The testing process required to earn ASME A112.3.4/CSA B45.9 certification takes time, costs money, and requires a product to be manufactured to a consistently high-standard. Many low-cost imports sold through online marketplaces have never been submitted for independent testing, or use materials and construction methods that would not withstand the scrutiny.

Some of these products display a CE mark a European self-declaration that carries no third-party validation and is not accepted under any U.S. plumbing code.
Others claim to "meet standards" in their marketing copy without specifying which standard or providing any verification. The majority of low-cost macerator brands available on Amazon and through discount suppliers simply cannot be verified through the CSA Group Product Listing, because they have never been certified.
The results range from failed inspections to product failures causing sewage backups in finished spaces. We've documented real cases of this outcome. 

How to Verify in Under 2 Minutes
1. Go to the CSA Group Product Listing at csagroup.org/testing-certification/product-listing/the primary certification
database for ASME A112.3.4 certified products
2. Search by manufacturer name or model number
3. If listed, you'll see the certification details and the applicable standard
4. If not listed, the product may not be certified request a certification letter
from the manufacturer to confirm

You can also check the IAPMO R&T Product Listing Directory at pld.iapmo.org for products carrying the cUPC mark as an additional verification step.
All Saniflo products in our current lineup are certified by CSA Group to ASME
A112.3.4/CSA B45.9. Certification documentation is available on request for permit
packages.