Recently, the U.S. Consumer Product Safety Commission (CPSC) issued a warning regarding certain kitchen and bathroom faucets sold on Amazon. Testing found lead leaching from products associated with nine brands. Three of these brands, involving more than 100,000 faucets in total, have initiated recalls, while the remaining brands received public warnings after failing to establish acceptable recall plans.The CPSC urged consumers to stop using certain China-made faucets sold on Amazon.com because lead exposure from these products may pose health risks, particularly to infants, young children, and pregnant women. Lead exposure may adversely affect the nervous system and has been associated with problems involving attention, cognitive function, and intellectual development.The incident has brought a question that is often overlooked back into focus:Why has lead traditionally been added to copper alloys used in faucets, and what purpose does it serve?
Although lead can pose health risks, it has historically offered practical advantages during the processing of copper alloys. Its main benefits include improved machinability, casting performance, and surface finish.
In leaded brass, lead is typically present as dispersed particles. During machining, these particles can provide a lubricating effect, reducing friction between the cutting tool and the material.For leaded brass containing approximately 2%–4% lead, machinability can be significantly improved. It can also help reduce tool wear, increasing machining efficiency and extending tool life.
Lead can also improve the flow characteristics of copper alloys during casting.When molten alloy enters a complex mold, better flowability helps the material fill the cavity more completely, making complex shapes easier to produce and potentially reducing certain casting defects.
During machining, leaded copper alloys are generally less prone to tearing and burr formation. The presence of lead particles can also help improve the resulting surface finish.These processing advantages are among the reasons leaded copper alloys have historically been widely used in certain plumbing and sanitary products.However, for products that come into direct contact with drinking water, manufacturing performance is not the only consideration. Material safety and the risk of lead leaching are equally important.
As drinking water safety requirements have become increasingly stringent, major markets have established their own standards and regulations for products that come into contact with drinking water.
Under the relevant requirements of GB18145-2014, lead leaching from the product must remain within the specified limit:
Lead leaching: ≤5 μg/L
The U.S. market has strict requirements for lead content and lead leaching in drinking water system components.The main standards and certifications referenced in this context include:
· NSF/ANSI/CAN 372
· NSF/ANSI 61, Annex G
· California AB 1953
NSF/ANSI/CAN 372 primarily addresses lead content in drinking water system components. If the lead content of all wetted components is no more than 0.25%, the product can be evaluated according to the applicable requirements. If any wetted component exceeds 0.25%, a weighted average lead content calculation is required.NSF 61 focuses more specifically on potential chemical contaminants and their health effects in drinking water systems. It establishes limits for the leaching of substances including lead and cadmium, with a lead leaching limit of no more than 5 μg/L.California AB 1953 also defines “lead-free” for drinking water plumbing, fittings, and fixtures based on a weighted average lead content. The weighted average lead content of wetted surfaces must not exceed 0.25%, with additional requirements applying to solder and flux.
Australia also has specific requirements for the safety of materials used in drinking water systems.Relevant requirements include WaterMark certification and standards such as AS/NZS 3718 and AS/NZS 4020.Metal and metal-alloy components that come into contact with hot or cold drinking water must meet applicable requirements for lead content and performance. AS/NZS 4020 also specifies requirements for lead levels in test-water extracts from products that come into contact with drinking water.
In Europe, copper materials used in contact with drinking water are primarily assessed under the requirements of the 4MS Initiative.Examples of copper alloys covered by the relevant material classifications include:
· Machined copper alloys: CuZn40Pb2 / CW617N
· Copper fittings for taps: CuZn37 / CW508L
· Cast copper bodies: CC770S, CC771S, CuZn35Al-C
Although regulatory systems vary from one market to another, they share the same fundamental concern:Products that come into contact with drinking water must meet appropriate material-safety requirements and control the risk of lead leaching.
The Amazon faucet recall serves as another reminder to the plumbing and sanitaryware industry that product safety cannot be judged solely by appearance, price, or ease of manufacturing.Material selection is also a critical factor in product quality and safety.Traditional leaded brass offers clear advantages in machining and manufacturing. However, for products associated with drinking water, reducing heavy-metal risks at the material level has become an increasingly important direction for the industry.Bestware has chosen food-grade stainless steel as an alternative to traditional leaded brass, helping reduce the risk of heavy-metal contamination at the material source.Bestware continues to develop commercial faucet solutions that are lead-free, safer, and built for long-term durability.From material selection and manufacturing processes to real-world applications, Bestware continues to advance stainless steel commercial faucet technology and provide customers with comprehensive stainless steel commercial faucet solutions.Choosing safer materials is more than a product upgrade—it is a commitment to drinking water safety.
