ASME A112.18.1 / CSA B125.1 & ASME A112.18.6 / CSA B125.6 Certification
ASME A112.18.1 / CSA B125.1 & ASME A112.18.6 / CSA B125.6 establish harmonised requirements for plumbing supply fittings and flexible water connectors across North America.
These standards define mechanical performance, durability and functional requirements for products installed at the point of use within plumbing systems.
A structured approach helps clarify applicable requirements, coordinate certification activities and ensure products meet the expectations of both US and Canadian markets.
What are ASME A112.18.1 / CSA B125.1 & ASME A112.18.6 / CSA B125.6?
ASME A112.18.1 / CSA B125.1 applies to plumbing supply fittings such as faucets, shower heads and associated components used within residential, commercial and public buildings.
It defines requirements for:
- Mechanical performance and durability
- Flow rate and functional performance
- Material suitability for water contact
- Backflow protection and product integrity
ASME A112.18.6 / CSA B125.6 applies to flexible water connectors used to connect plumbing fixtures to the water supply.
It includes requirements for:
- Pressure resistance and sealing performance
- Temperature and environmental durability
- Material construction and suitability
- Installation conditions, including accessibility for inspection and maintenance
Together, these standards ensure that plumbing components perform reliably under operating conditions and are suitable for long-term use within pressurised water systems.
Where ASME A112.18.1 / CSA B125.1 & ASME A112.18.6 / CSA B125.6 Apply?
This commonly includes:
- Kitchen and bathroom faucets
- Shower heads and shower systems
- Plumbing supply fittings and valves
- Flexible water connectors for taps, toilets and appliances
- Products requiring compliance with US and Canadian plumbing codes
Understanding applicability early is important, particularly where products must meet both performance and material-related requirements for market access and specification.
Certification & Compliance Process
Achieving compliance with ASME / CSA plumbing standards requires alignment with defined performance requirements and certification body processes.
This typically involves:
- Identification of applicable standards based on product type and function
- Review of product design, materials and intended use
- Laboratory testing for mechanical performance, flow characteristics and durability
- Assessment of product construction, sealing and integrity
- Certification, product listing and ongoing compliance requirements
Certification is typically delivered through recognised certification body programmes, which may include product testing, documentation review and ongoing monitoring activities.
Requirements may vary depending on product type, design complexity and certification body approach.
How AquaCompliance Supports
AquaCompliance provides structured advisory and project guidance across ASME / CSA plumbing certification, supporting manufacturers from initial assessment through to certification.
- Regulatory Pathway Definition — Establishing applicable standards based on product type, configuration and intended use
- Documentation Review — Evaluating product specifications, materials and supporting technical data to identify gaps and opportunities to utilise existing information
- Laboratory & Certification Coordination — Working with laboratories and certification bodies to define testing requirements and align programme timelines
- Certification Engagement — Supporting communication with certification bodies to address queries and progress approvals.
- Commercial & Technical Alignment — Identifying how ASME / CSA requirements align with related standards such as NSF/ANSI 61 & 372 to reduce duplication and optimise testing strategies
- Application & Project Management — Coordinating activities across internal teams, laboratories and certification bodies to support delivery from initial assessment through to certification.
Key Considerations
ASME / CSA plumbing standards are influenced by several product-specific and application-driven factors that should be defined early in the certification process:
- Product type, configuration and intended application
- Functional requirements, including flow rate and operating conditions
- Material selection and suitability for water contact
- Availability and completeness of technical documentation
- Laboratory capability and testing scope
- Certification body requirements and timelines
In addition, several technical and commercial factors can influence certification scope, timelines and cost:
- Product design complexity — Including moving components, sealing systems and functional features
- Performance expectations — Durability, life cycle testing and pressure resistance requirements
- Integration with other components — Including compatibility with connectors and system interfaces
- Alignment with material standards — Where products also require compliance with NSF/ANSI 61 & 372
- Product range variation — Multiple models, finishes or configurations may expand testing scope
- Certification body approac — Differences in testing, audit and surveillance requirements may impact timelines and ongoing obligations
Certification requirements are defined within the ASME / CSA standards and applied through certification body programmes, with testing conducted by accredited laboratories.
Clear definition of product scope and intended use supports efficient certification and reduces the risk of rework.
Related Requirements
ASME / CSA plumbing standards are typically applied alongside other North American requirements, depending on product type and system integration.
This may include:
- NSF/ANSI 61 and 372 – Where material safety and lead content requirements apply, typically forming a prerequisite for certification of drinking water treatment devices
Although ASME / CSA standards focus on mechanical performance and functional requirements, these standards address material safety, system performance and product integration across broader plumbing applications.
A coordinated approach helps ensure requirements are clearly defined, reducing duplication and supporting efficient progression across multiple certification pathways.
While UK and European frameworks such as WRAS approval and BS 6920 testing and the EU Drinking Water Directive (DWD) are not directly interchangeable with North American standards, the technical data, material assessments and supporting documentation developed through ASME / CSA certification programmes can be used to inform wider compliance strategies.
Considering these requirements early allows manufacturers to align certification activities, reduce duplication and plan more effectively across multiple regulatory frameworks.
If you are planning certification, or market entry in North America, early clarity on applicable standards and requirements is essential.
AquaCompliance works with manufacturers to define certification pathways, coordinate testing and certification activities, and maintain alignment across multiple standards and approval programmes.
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