Lead in drinking water — the new action level, and the two things you are owed

By Andrew Bates, FounderPublished 2026-09-10Updated 2026-09-10

EPA lowered the lead action level from 15 to 10 micrograms per litre, and most utilities must now replace lead service lines within 10 years. Two things you can act on today: your utility must publish its service line inventory, and after repeated exceedances it must supply certified filters.

The rule changed, and two parts of it are yours to use

EPA’s Lead and Copper Rule Improvements lowered the lead action level from 15 to 10 micrograms per litre, and require the vast majority of water systems to replace lead service lines within 10 years. EPA puts the scale at up to 9 million homes and businesses still connected through legacy lead pipes.

Most coverage stops there, because the rest is about utilities. Two provisions are directly actionable by a household, and they are the reason to read on.

Your utility must publish its inventory. Water systems are required to make their lead service line inventory and replacement plans available to the public. That means you can look up whether a lead line serves your address rather than guessing from the age of the house.

After repeated exceedances, your utility must supply filters. Systems with multiple exceedances of the action level are required to “make filters that are certified to reduce lead available to all consumers”, alongside continued treatment adjustment and outreach. Most people in affected systems do not know this exists.

Where the lead is actually coming from

EPA is specific about the ranking. Where a home has a lead service line connecting it to the water main, “these pipes are typically the most significant source of lead in the water.” Lead pipes are more likely in older cities and in homes built before 1986, the year new lead pipe installation was banned.

Without a lead service line, the common problem shifts to brass or chrome-plated brass faucets and plumbing with lead solder.

→ What your own pipes and fittings add after the meter

Which is where a legal definition catches people out. Under the Safe Drinking Water Act, “lead free” means a weighted average of 0.25 percent lead across the wetted surfaces of pipes, fittings and fixtures, and 0.2 percent for solder and flux.

Lead free is a threshold, not an absence. A fully compliant fixture can still contribute lead to the water standing in it overnight.

Corrosion is what mobilises it. EPA notes lead dissolves into water that “has high acidity or low mineral content” — the same chemistry that drives blue-green staining from copper.

The number that is not a safety threshold

EPA sets the Maximum Contaminant Level Goal for lead at zero, and says why in one sentence: “there is no safe level of exposure to lead.”

So the 10 µg/L action level is not a line below which water is established as safe. It is the point at which a system must act. Read any “meets EPA standards” statement about lead with that distinction intact.

Exposure share matters when deciding how hard to treat. EPA estimates drinking water is 20 percent or more of total lead exposure — but for infants fed mostly on mixed formula, 40 to 60 percent. That single figure is why formula preparation is the strongest case for point-of-use treatment in this entire guide.

The decision path

Your situation	What to do first	Where that lands you
Home built before 1986, line material unknown	Check the utility’s published inventory	Lead line confirmed → filter now, replacement is owed within 10 years
Inventory lists your line as unknown	Ask the utility, or have the line identified	Unknown is not lead-free; treat as suspect until identified
System has had multiple action-level exceedances	Ask the utility for a certified filter	It is required to make them available to all consumers
No lead service line, older fixtures	Test first-draw water at the tap you drink from	Lead from solder or brass → point-of-use filter with a lead claim
Infant fed on mixed formula	Treat the tap used for formula regardless	40 to 60 percent of that infant’s exposure runs through this water
Post-1986 home, confirmed non-lead line	No action indicated	Retest only if plumbing is altered

Choose point-of-use filtration if

The inventory shows a lead service line, or lists your line as unknown.
Your home predates 1986 and has original fixtures or solder.
An infant in the house is fed on mixed formula. EPA puts water at 40 to 60 percent of that infant’s lead exposure.
The model carries an NSF/ANSI 53 claim for lead specifically, not a general filtration badge.

Choose to contact your utility first if

You do not know your service line material. The inventory is required to be public and costs nothing to consult.
Your system has exceeded the action level more than once. It is then required to make certified lead filters available to all consumers.
You want to know where your address sits in the ten-year replacement plan.

Choose to test before acting if

There is no lead service line but the plumbing is old, so brass and solder are the open question.
You need a number for your own tap rather than a system-wide compliance figure. Draw first-draw water from the tap you actually drink from.

Mistakes that cost the most money

Reading “meets EPA standards” as lead-free. The action level is a utility trigger. The health goal is zero, and EPA says no exposure level is safe.

Trusting “lead free” on a fixture. It permits 0.25 percent by weighted average. It is a compliance label, not a statement that no lead is present.

Assuming an unknown line is a safe line. Inventories record what the utility knows. Unknown means unidentified, not cleared.

Buying a whole-house system for lead. Lead is picked up in the service line and household plumbing, which sits downstream of where a whole-house unit is installed. Point-of-use at the tap you drink from is the treated route.

Filtering hot water. Hot water dissolves more lead and most filters are not rated for it. Use cold for drinking and cooking, and for formula.

Assuming the utility’s sample represents your tap. Compliance sampling is system-wide at selected sites. It is not a reading for your house.

Three situations, and what changes

Pre-1986 home in an older city. Highest prior probability of a lead service line. Start at the inventory, filter at the tap while you wait, and hold the utility to the replacement timeline.

Newer home, older fixtures. No service line risk, but brass and solder remain. A first-draw test at the kitchen tap answers it, because that is the water that sat against the fixture overnight.

Household with an infant on formula. The exposure share changes the maths entirely. EPA puts formula-fed infants at 40 to 60 percent of lead exposure from water, so treat that tap before establishing anything else.

The objections worth answering

“Our water report says lead is fine.” Compliance sampling is taken at selected sites across a system and reported as system performance. It is not a measurement of your tap, and the action level it is judged against is not a safety threshold.

“The city says they will replace the line eventually.” Ten years is the outer bound for most systems. Filtering at the tap covers the interval, and the inventory tells you where you sit in the queue.

“Won’t running the tap clear it?” Flushing reduces water that has been standing, which is why the rule samples the fifth litre as well as the first. It is a mitigation, not a treatment, and it does not address the pipe.

Who this is for

Households on a public water system trying to establish whether lead reaches their tap, and what the utility owes them while service line replacement is pending.

What to ask your utility

Is my address served by a lead service line in your published inventory, where does it sit in the replacement plan, and has this system had multiple lead action level exceedances?

That last clause is the one worth asking out loud. It is the difference between buying a filter and being given one.

Choosing and verifying a filter:

→ The 615 filters certified for lead, and the category with none → What NSF/ANSI 53 certification does and does not cover → Why lead is a point-of-use problem, not a whole-house one → Chlorine vs chloramine, and why the filter claim differs

Where the lead is coming from:

→ Copper: the visible half of the Lead and Copper Rule → Why acidic water dissolves metal from your own plumbing → How to read the water report your utility sends you → City water treatment, and the three gaps a utility cannot close → Testing city water for lead, and what EPA says it costs → Boil water notices: boiling concentrates lead rather than removing it → Lead in school drinking water, where the federal programme is voluntary → Cross-connections, and who owns the plumbing after the meter → Home plumbing materials, and what “lead free” actually permits

The bottom line

The action level is now 10 micrograms per litre, down from 15, and most systems must replace lead service lines within 10 years. Start with your utility's published inventory, because it is required to be public and it tells you whether a lead line serves your address. If your system has had multiple exceedances it must make certified lead-reduction filters available to you. Filter at the tap with an NSF/ANSI 53 lead claim while replacement is pending, and remember EPA sets the health goal for lead at zero — the action level is a trigger for the utility, not a safe threshold for you.

Who this is not for

This page cannot tell you whether your tap has lead. Utility sampling is a system-wide compliance measure taken at selected sites, not a reading for your house, and an inventory may record your line as unknown rather than confirmed. Only a lab test of your own first-draw water gives you a number. It also does not cover lead in paint, soil or dust, which EPA names as exposure routes alongside water.

Questions

What is the lead action level in drinking water?

Ten micrograms per litre, lowered from 15 by EPA's Lead and Copper Rule Improvements. Exceeding it obliges the water system to inform the public and reduce exposure. It is a trigger for utility action, not a safe level — EPA sets the health goal for lead at zero.

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

Check your water system's lead service line inventory. The rule requires systems to make both the inventory and their replacement plans available to the public. Note that a line may be listed as unknown, which is not the same as confirmed lead-free.

Does "lead free" plumbing contain no lead?

No. Under the Safe Drinking Water Act, lead free means a weighted average of up to 0.25 percent lead across wetted surfaces, and 0.2 percent for solder and flux. It is a legal threshold rather than an absence, which is why first-draw water still matters.

Can I get a free lead filter from my water utility?

Possibly. Systems with multiple exceedances of the lead action level are required to make filters certified to reduce lead available to all consumers, alongside continued treatment adjustment and community outreach. Ask your utility whether that obligation has been triggered.

How much of my lead exposure comes from water?

EPA estimates drinking water can be 20 percent or more of total exposure. For infants fed mostly with mixed formula it rises to between 40 and 60 percent, which is why formula preparation is the case where water treatment matters most.

Why does my utility sample the first and fifth litre?

At sites with lead service lines the rule requires both, using the higher value for compliance. The fifth litre reaches water that sat in the service line itself. It shows why one convenience sample can understate lead at a tap.

Sources — 12 claims

EPA — Basic Information about Lead in Drinking Water
EPA has set the Maximum Contaminant Level Goal for lead in drinking water at zero, because the best available science shows there is no safe level of exposure to lead. (captured 2026-09-10)
Limits: The MCLG is a non-enforceable health goal, not a limit a utility must meet. The enforceable trigger is the action level, which is a separate and higher number.
EPA — Basic Information about Lead in Drinking Water
EPA estimates drinking water can make up 20 percent or more of a person’s total lead exposure, and that infants consuming mostly mixed formula can receive 40 to 60 percent of their exposure from drinking water. (captured 2026-09-10)
Limits: These are exposure shares, not concentrations. Lead also reaches people through paint, dust, soil, air and food, so treating water addresses part of a total exposure.
EPA — Basic Information about Lead in Drinking Water
EPA states that where a home has a lead service line connecting it to the water main, that pipe is typically the most significant source of lead in the water, and lead pipes are more likely in older cities and homes built before 1986. (captured 2026-09-10)
Limits: Homes without a lead service line can still have lead from brass or chrome-plated brass faucets and from lead solder, which EPA names as the most common problem in those homes.
EPA — Basic Information about Lead in Drinking Water
Under the Safe Drinking Water Act, "lead free" plumbing means a weighted average of no more than 0.25 percent lead across the wetted surfaces of pipes, fittings and fixtures, and no more than 0.2 percent for solder and flux. (captured 2026-09-10)
Limits: "Lead free" is a legal threshold, not an absence of lead. A compliant fixture may still contribute lead, which is why first-draw water matters.
EPA — Fact Sheet: EPA’s Lead and Copper Rule Improvements (October 2024)
EPA’s Lead and Copper Rule Improvements lower the lead action level from 15 micrograms per litre to 10 micrograms per litre. (captured 2026-09-10)
Limits: The action level is a trigger for utility action, not a health-based safe level — EPA sets the health goal for lead at zero. Exceeding it obliges the system to act; it does not by itself mean an individual tap is above or below it.
EPA — Fact Sheet: EPA’s Lead and Copper Rule Improvements (October 2024)
The Lead and Copper Rule Improvements require the vast majority of water systems to replace lead service lines within 10 years, and EPA states up to 9 million homes and businesses are still connected through legacy lead pipes. (captured 2026-09-10)
Limits: EPA notes that a limited number of systems in limited circumstances receive additional time. The requirement is on the utility for the service line, and does not cover lead in a household’s own internal plumbing.
EPA — Fact Sheet: EPA’s Lead and Copper Rule Improvements (October 2024)
Water systems must make their lead service line inventory and replacement plans available to the public. (captured 2026-09-10)
Limits: An inventory records what the utility knows or has assumed about each service line. Material may be listed as unknown, which is not the same as confirmed lead-free.
EPA — Fact Sheet: EPA’s Lead and Copper Rule Improvements (October 2024)
Water systems with multiple exceedances of the lead action level are required to make filters certified to reduce lead available to all consumers. (captured 2026-09-10)
Limits: This obligation is triggered by multiple exceedances, not by a single one, and the rule text governs what "available" requires of a given system.
EPA — Fact Sheet: EPA’s Lead and Copper Rule Improvements (October 2024)
For sites with lead service lines, the Lead and Copper Rule Improvements require water systems to collect and analyse the first litre and the fifth litre, and to use the higher of the two values for compliance. (captured 2026-09-10)
Limits: This is the utility’s compliance sampling protocol. It is not guidance for a household test, though it shows why a single convenience sample can understate lead.
EPA — Fact Sheet: EPA’s Lead and Copper Rule Improvements (October 2024)
The Lead and Copper Rule Improvements require Consumer Confidence Reports to include clear health language about the dangers of lead, information about testing for lead in schools and childcare facilities, and where to find the system’s lead service line replacement plan. (captured 2026-09-10)
Limits: This governs what the report must contain. It does not establish what the lead result for any particular household will be.
NSF — NSF/ANSI 42, 53 and 401: Filtration Systems Standards (page dated 2025-12-16)
NSF lists the contaminant claims available under NSF/ANSI 42 as chlorine, taste and odor, chloramine, particulate, iron, manganese, zinc, and total dissolved solids. (captured 2026-09-09)
Limits: NSF does not state whether this list is complete. Do not present it as the full set of claims available under the standard.
EPA — National Primary Drinking Water Regulations
EPA's Maximum Contaminant Level for nitrate (measured as nitrogen) is 10 mg/L. It is a legally enforceable standard. (captured 2026-09-09)
Limits: A legally enforceable federal health standard for public water systems. It does not apply to private wells, which are unregulated — the number is still the right reference point, but no one is testing a private well on the homeowner's behalf.