Selecting Certified Pumping Systems for Drinking Water
Specifying pumping systems for potable water requires more than meeting performance requirements. Engineers also need to account for drinking water standards such as NSF/ANSI 61, which establishes health requirements for materials and products that come into contact with drinking water. Certification can extend beyond individual pump components to the complete system configuration, operating conditions and manufacturing location.
Understanding how these requirements apply during specification can help engineers select compliant pumping systems, avoid approval issues and support long-term reliability.
- What Does NSF/ANSI 61 Mean for Drinking Water Pumping Systems?
- Does NSF/ANSI 61 Apply to the Complete Pumping System?
- What Should Engineers Verify When Selecting a Certified Pumping System?
- How Can Engineers Verify NSF/ANSI 61 Certification?
- How Can Engineers Maintain Compliance Throughout the Pumping System Life Cycle?
What Does NSF/ANSI 61 Mean for Drinking Water Pumping Systems?
NSF/ANSI 61 evaluates materials and products that come into contact with drinking water to help ensure substances leaching from system components do not pose a risk to human health. For municipal pumping systems, this means considering all wetted components rather than evaluating only the primary pump.
Components that may require evaluation include:
Does NSF/ANSI 61 Apply to the Complete Pumping System?
Compliance is not always limited to individual components. Certification may apply to a defined pumping system configuration, including how its components are manufactured, assembled and used. A system using compliant materials or components should not automatically be assumed to meet the requirements of the complete certified configuration.
Manufacturing location can also affect certification. A system assembled using compliant materials may not meet certification requirements if it is manufactured or assembled at a facility that has not been evaluated and approved as part of the certification process.
What Should Engineers Verify When Selecting a Certified Pumping System?
Engineers should evaluate the complete certification scope rather than relying on general claims of compliance. Before specifying a pumping system for drinking water, verify:
- Wetted materials: Confirm that surfaces in contact with potable water meet applicable NSF/ANSI 61 requirements for the intended operating conditions.
- System configuration: Verify that the specific configuration is covered, since changes to seals, coatings or auxiliary components may affect compliance.
- Operating conditions: Confirm that pressure, temperature and flow remain within certified limits.
- Manufacturing location: Determine whether the location where the system is manufactured or assembled has been evaluated as part of the certification.
- Service and maintenance requirements: Consider whether replacement parts, lubricants or future modifications could affect compliance.
How Can Engineers Verify NSF/ANSI 61 Certification?
Engineers can verify certification by reviewing listings from independent certifying bodies along with manufacturer documentation for the specified pumping system. These listings define the scope of certification and can identify approved materials, configurations, operating limitations and manufacturing locations.
Digital configuration and selection tools from some manufacturers help engineers ensure they select only certified system configurations. This helps maintain compliance in design, approval and submittal stages, and can significantly reduce the likelihood of delays or redesigns during project execution.
Confirming these details early in specification can reduce the risk of approval issues or system redesign later in the project.
How Can Engineers Maintain Compliance Throughout the Pumping System Life Cycle?
Full-length version featured in the Pumps and Systems article: Specifying Pumping Systems for Potable Water Applications