Lead & Copper in Home Drinking Water

Already know you need help? Contact Us or use our contact form.

Where it comes from

Lead and copper almost always come from plumbing, not the source

Unlike many drinking water contaminants that originate in the source water itself, lead and copper in tap water are overwhelmingly a plumbing issue. Water leaving a treatment plant is typically lead-free; it picks up lead (and, less commonly, copper) through contact with lead-containing materials somewhere between the treatment plant and your faucet — most often a lead service line connecting your home to the water main, lead solder used at pipe joints in homes built before 1986 (when lead solder was banned in the federal Safe Drinking Water Act amendments), or certain older brass fixtures. This is why lead risk is closely tied to a home's age and plumbing history rather than which utility serves the area.

The regulation

How the Lead and Copper Rule works

Under the federal Lead and Copper Rule, public water systems are required to periodically sample a representative set of higher-risk homes in their service area (typically ones more likely to have lead plumbing) and treat the water to make it less corrosive to any lead or copper it contacts — commonly by adjusting pH or adding a corrosion inhibitor. If sampling shows lead above the EPA's action level of 15 parts per billion (ppb) in more than 10% of samples, the utility must take additional steps, which can include enhanced corrosion control treatment, public education, and (increasingly, under updated federal requirements) lead service line replacement programs.

It's worth noting this 15 ppb action level is a system-wide compliance trigger for utilities, not a per-home safety guarantee — an individual home with a lead service line can still have an elevated result even when its utility is fully in compliance system-wide. This is a different context from the 5 ppb action level New York schools follow for individual outlets under 10 NYCRR Subpart 67-4, which we cover on our NY School Lead Testing Overview page.

What homeowners can do

Testing and reducing exposure at home

• Check whether your utility has published a lead service line inventory, and whether your address is listed as lead, non-lead, or unknown
• Request a tap water test through your utility or a certified lab, particularly if your home was built before 1986 or has an unknown service line material
• Run cold water for a minute or two before drinking or cooking use, especially after water has sat unused for several hours
• Use cold water rather than hot for drinking, cooking, and infant formula preparation, since hot water dissolves lead more readily
• Consider an NSF/ANSI Standard 53-certified filter rated for lead reduction if a test confirms elevated levels, or a full replacement of any confirmed lead service line where feasible

Related reading

See also

Our PFAS (Forever Chemicals) guide covers a different, unrelated class of contaminants, and our Private Well Water Testing guide covers lead testing specifically for well owners, whose homes aren't subject to the Lead and Copper Rule at all since it applies only to public water systems.

Get help

Want help with testing or a filtration option?

a qualified local provider can help you understand a lead test result and recommend certified filtration or other next steps if you'd rather not navigate it alone.

Official sources

Official source links

• EPA: Lead and Copper Rule
• EPA: Basic Information About Lead in Drinking Water
• NYSDOH: Bureau of Safe Drinking Water

FAQ

Frequently asked questions

Does New York test my tap water for lead automatically?

Per EPA's Lead and Copper Rule: public water systems test at a sample of representative homes, but this is not the same as testing every individual home's tap. If you want to know your own home's specific result, you generally need to request a test yourself, often through your utility or a certified lab.

How would lead get into my water if the source water doesn't have any?

Lead typically enters drinking water through contact with lead-containing plumbing materials — lead service lines connecting a home to the water main, lead solder used in older copper pipe joints (common before 1986), or certain brass fixtures. Water picks up lead as it sits in contact with these materials, which is why first-draw water (the water that's been sitting in the pipe overnight) typically has the highest lead levels of the day.

How do I know if my home has a lead service line?

Many NY utilities have published lead service line inventories in recent years as part of federal requirements; check your provider's website or contact them directly. Homes built before 1950 are more likely to have a lead service line, though it depended heavily on local plumbing codes and practices at the time.

What's a simple way to reduce my exposure without a whole-house system?

Running your cold tap for a minute or two before using it for drinking or cooking (especially first thing in the morning, or after water has sat unused for several hours) flushes out water that's had the most contact time with plumbing. Using cold water for drinking and cooking rather than hot is also a simple habit, since hot water dissolves lead more readily. Neither of these fully eliminates a real lead source, but both reduce exposure while you look into further testing or filtration.

Last reviewed: July 9, 2026