Brass is safe for drinking water when it meets modern lead-free standards, but older brass fittings can leach lead and other metals into your water supply. The key factor is how much lead the brass contains. Since 2014, U.S. law has required that any brass component touching drinking water contain no more than 0.25% lead by weighted average across its wetted surfaces. Brass manufactured before that standard may contain significantly more.
Why Lead in Brass Is the Main Concern
Brass is an alloy of copper and zinc, and manufacturers historically added lead to make it easier to machine and shape. That lead doesn’t stay locked inside the metal forever. Over time, water flowing through brass fittings, valves, and faucets can dissolve trace amounts of lead from the surface, especially when water sits in contact with the brass for hours overnight or during vacations.
Lead in drinking water is harmful at any meaningful level. It damages the brain and kidneys, interferes with red blood cell production, and disrupts oxygen transport in the body. Children are particularly vulnerable because lead exposure has been linked to lower IQ. Pregnant and nursing women face additional risks since lead crosses the placenta and passes through breast milk, potentially causing miscarriage or harming fetal development. Adults with existing kidney problems or high blood pressure are also more sensitive to low-level exposure.
What “Lead Free” Actually Means
The term “lead free” is a legal definition, not a guarantee of zero lead. Under Section 1417 of the Safe Drinking Water Act, brass pipes, fittings, and fixtures are considered lead free if the weighted average lead content across all surfaces that touch water is 0.25% or less. Solder and flux have an even stricter limit of 0.2%. These thresholds were tightened significantly from the previous standard, which allowed up to 8% lead in brass components.
As of September 2020, the EPA requires manufacturers and importers to certify that their products meet this 0.25% standard before they can be sold for use in drinking water systems. So any new brass fitting you buy today at a hardware store for potable water use should comply. The problem lies with older homes and buildings where pre-2014 brass fittings may still be in place.
How to Identify Compliant Brass Products
When shopping for brass fittings, valves, or faucets intended for drinking water, look for certification marks on the product itself or its packaging. The most common certifications to look for are:
- NSF/ANSI 372: Confirms the product meets the 0.25% weighted average lead content requirement.
- NSF/ANSI 61 Annex G: Goes further by verifying both lead content and the amount of contaminants (metals and non-metals) that actually leach into water during testing.
- CA HSC ยง116875 (AB 1953): California’s lead-free standard, which also uses the 0.25% threshold.
These marks are typically engraved on the product or printed on the packaging. Some products may also carry the text “Low-Lead” alongside the certification mark. If a brass fitting has no certification and no mention of lead-free compliance, don’t use it for drinking water.
Dezincification: A Secondary Risk
Lead isn’t the only concern with brass in water systems. Dezincification is a corrosion process where zinc selectively dissolves out of the alloy, leaving behind a weakened, porous copper structure. This doesn’t just compromise the fitting’s integrity over time. It can also change how the brass surface interacts with water, potentially increasing metal leaching.
Several factors accelerate dezincification. Water with low alkalinity and high sulfate concentration is particularly aggressive toward brass. The internal structure of the alloy matters too: research has identified microstructure as the most critical factor in how quickly brass components break down. Brass alloys containing iron tend to be more prone to this type of corrosion. If you have soft, acidic, or otherwise aggressive water, brass fittings may degrade faster than expected even when they meet lead-free standards.
Practical Steps to Reduce Exposure
Even with compliant brass fittings, metals leach more readily when water sits stagnant in pipes. The simplest way to reduce your exposure is flushing. If water has been sitting in your pipes for several hours (overnight, for example), let the kitchen faucet run for 30 seconds to one minute, or until the water feels noticeably cold, before using it for drinking or cooking. Cold water indicates fresh supply water has reached the tap, pushing out the water that was sitting in contact with your plumbing.
For buildings with longer pipe runs, like schools or office buildings, the EPA recommends a more thorough approach: running the faucet farthest from the service line for up to 10 minutes, then flushing individual drinking outlets for 30 seconds to one minute each. Refrigerated water fountains need about 15 minutes of flushing. Flushing one fixture doesn’t clear another, so each drinking water outlet needs to be flushed individually.
A few other habits help. Always use cold water for drinking and cooking, since hot water dissolves metals from plumbing more readily. If you’re concerned about older brass components in your home, a point-of-use water filter certified for lead removal provides an additional layer of protection.
Stainless Steel as an Alternative
If you want to avoid the lead question entirely, stainless steel fittings are the most common alternative. Stainless steel contains no lead, resists corrosion better than brass (especially in hard or chemically aggressive water), and doesn’t harbor bacteria as easily. It costs more upfront and can be harder to work with during installation, but it eliminates the lead-leaching variable.
Brass still has practical advantages for many applications. It’s easier to machine, widely available, and holds up well under normal water conditions. For most homeowners buying new, certified lead-free brass from a reputable manufacturer, the risk is minimal. The people who should think more carefully are those with older plumbing, aggressive water chemistry, or a particular need for the safest possible option, such as homes with young children or pregnant residents.
The Bigger Picture on Lead Pipes
Brass fittings are just one potential source of lead in a plumbing system. Lead service lines connecting homes to water mains remain a widespread problem across the U.S. In October 2024, the EPA issued a final rule requiring drinking water systems nationwide to identify and replace lead service lines within 10 years. If your home was built before the mid-1980s and you’re unsure whether your service line is lead, contacting your water utility is a reasonable first step. Many utilities now maintain public maps or databases showing which neighborhoods still have lead lines.