The question of lead in brass and drinking water safety is one of the most important conversations in our industry, and it deserves a straight answer — including the parts that are sometimes glossed over in supplier marketing.
The short answer: properly certified brass fittings from a reputable manufacturer are safe for drinking water use. The longer answer involves understanding which grades are acceptable, which certifications actually mean something, and why you should not simply take a supplier's word for it.
The Lead Question
Traditional machineable brass contains lead — 2.2–3.5% in CW614N and 1.6–2.2% in CW617N. Lead improves machinability dramatically, which is why it has been used for decades. The concern: in contact with drinking water, a small amount of lead can leach from the alloy into the water, particularly in stagnant conditions (water that has sat in the pipe for several hours).
The health implications of lead in drinking water are serious and well-documented, which is why regulators globally have tightened limits significantly over the past 20 years.
The two big markets restrict lead in different ways. The USA sets a content limit: since 4 January 2014, federal law (Safe Drinking Water Act, Section 1417) defines "lead free" as a weighted average of no more than 0.25% lead across the wetted surfaces, verified to NSF/ANSI 372. The EU works with positive lists of accepted metallic compositions under the Drinking Water Directive 2020/2184: the European list, which applies from 31 December 2026, names the lead-free silicon brass CW724R and the low-lead brasses CW510L and CW509L, and no leaded brass. The lead value in the water itself falls from 10 to 5 µg/L in January 2036. In both markets, the free-machining grade CW614N (2.2–3.5% lead) is not an alloy for wetted drinking-water parts.
Brass Grades and Lead Content
| Grade | Lead Content | Potable Water Status | Notes |
|---|---|---|---|
| CW614N (EN 12164) | 2.2–3.5% | Not used for wetted drinking-water parts | Free-machining reference alloy for non-potable components |
| CW617N (EN 12165) | 1.6–2.2% | In Europe under national approvals, usable until 31 December 2032 — not on the European positive list; cannot meet the US 0.25% rule | Forging brass; traditional plumbing grade; not dezincification-resistant |
| CW602N / C35330 (DZR) | 1.7–2.8% / 1.5–3.5% | Widely used in approved UK fittings; not on the European positive list; cannot meet the US 0.25% rule or the Australian lead-free rule in force since 1 May 2026 | Dezincification-resistant, but a leaded alloy — not lead-free |
| CW724R / C69300 (silicon brass) | ≤ 0.10% / ≤ 0.09% | Lead-free; CW724R is on the European positive list, and both grades are within the US 0.25% limit | Dezincification-resistant; harder on tools, higher cost |
| C6802 (bismuth brass) | ≤ 0.10% | Lead-free; used mainly for North American programmes | Bismuth replaces lead as the chip-breaker |
What Certifications Actually Guarantee
A certification mark on a fitting is not a blanket guarantee of safety — it is a guarantee that the specific product, as tested, meets the specific standard the certification covers. The distinctions matter:
WRAS (UK): WRAS approval is voluntary evidence that a fitting complies with the Water Supply (Water Fittings) Regulations 1999. Non-metallic materials are tested to BS 6920 — odour and flavour, appearance, growth of micro-organisms and extraction of substances — and the complete fitting is tested mechanically; BS 6920 itself does not apply to metals. An approval belongs to one specific product and is valid for five years. Verify it in the approvals directory at wrasapprovals.co.uk.
NSF/ANSI 61 (USA): Tests for health effects — covers all substances that might leach from the fitting into drinking water. NSF/ANSI 372 adds the specific lead-free requirement (no more than 0.25% lead as a weighted average of the wetted surfaces). Both are required for plumbing code compliance in most US states.
WaterMark (Australia): Mandatory certification for fittings installed in Australian plumbing. Also requires DZR grade (AS 2345, marked “DR”) for copper-alloy fittings in contact with water; since 1 May 2026 new products for drinking water must also be lead free and carry the Lead Free WaterMark.
ACS (France) / KTW (Germany) / DVGW (Germany): the national schemes of France and Germany. From 31 December 2026 the European system applies in every member state: the alloy has to be on the European positive list, a notified body certifies the product (the certificate is valid for five years), and the product carries the marking "suitable for drinking water". Products whose national certificate is still valid on that date move to the European procedure by 31 December 2032.
The "First Flush" Issue
Even certified brass fittings with low lead content can show elevated lead readings in "first draw" water — the water that has been sitting in contact with the fitting overnight or for several hours. This is why health guidance in many countries recommends running the tap for 30 seconds before using drinking water in the morning, especially in buildings with new plumbing.
This is not a defect. It is a physics and chemistry reality — lead concentration is highest when water is stagnant in contact with brass. Flushing the line reduces it to background levels quickly.
New Builds vs Legacy Systems
For new installations, specify an alloy that is accepted in the market concerned — lead-free brass in the USA and, since 1 May 2026, in Australia; an alloy on the European positive list in the EU; DZR brass where the UK rules call for it — and a product that holds the local approval. These approvals are non-negotiable in regulated markets.
For legacy systems with older fittings: the risk is generally lower than people fear, particularly if the plumbing is in regular daily use (stagnation is the main risk factor). Replacing all fittings proactively is expensive and not always necessary. The practical guidance: test your water if there is any concern, run taps briefly in the morning in older buildings, and prioritise replacement at fitting failure or major renovation.
Our Approach at Brassland
We machine components to your drawing in the alloy you specify — leaded grades for non-potable and industrial parts, lead-free CW724R, C69300 or C6802 for drinking-water parts, and the leaded DZR grade CW602N where the market still accepts it, as in the UK — and every shipment carries an EN 10204 3.1 material certificate that shows the actual lead content of the heat. Brassland holds no product approvals: WRAS, NSF, WaterMark or ACS approval belongs to the finished product and to the company that places it on the market. We will tell you clearly which alloys are in use for your market.
Practical Buying Guidance
- For UK potable water: specify fittings with evidence of Regulation 4 compliance — WRAS approval is the usual one. Check the approvals directory to verify the specific product is listed.
- For USA: specify products certified to NSF/ANSI 61 and NSF/ANSI 372. The 0.25% lead limit is federal law in every state.
- For Australia: specify fittings with Lead Free WaterMark certification — since 1 May 2026, new copper-alloy products in contact with drinking water must have a weighted average lead content of not more than 0.25%. In aggressive water areas, explicitly specify a lead-free, dezincification-resistant grade such as CW724R.
- For the EU: specify an alloy on the European positive list, which applies from 31 December 2026 — for example CW724R, CW510L or CW509L. Leaded brass is not on the list; compositions approved nationally between 13 July 2021 and 31 December 2026 may be used until 31 December 2032.
- For non-potable applications (irrigation, industrial process, compressed air): standard leaded brass grades are perfectly acceptable and often preferred for machinability.
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Frequently asked questions
Are brass fittings safe for drinking water?
How much lead is allowed in drinking-water brass?
Which brass grades are used for potable water?
Sources & references
Potable-water references:
Last reviewed: September 2026. Standards and regulatory references are checked at each review.
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