Guides · Lead
Filters If You Have a Lead Service Line
What to do at the tap while the utility replaces the line — flushing, certified cartridges, and the mistakes that make lead worse.
Where the lead actually comes from
In most homes with a lead problem, the lead is not in the treated water leaving the plant. It dissolves into the water on the way to your glass — from a lead service line, from lead solder in older plumbing, or from brass fittings and faucets.
That is why a utility report can show compliance while your kitchen tap tests high: the report describes the system, your plumbing is downstream of it.
The two things that make lead worse
Stagnation: water sitting in a lead pipe picks up more lead. The first draw in the morning, or after a workday, is the worst glass of the day.
Hot water: heat dissolves lead faster, and hot water also spends time in a tank. Use cold water for drinking and cooking, always.
Flushing, honestly
Running the cold tap for one to two minutes — longer if the line is long — clears the water that sat in the service line. It is free and it is the single biggest reduction available to you today.
Flushing wastes water, so put it to use: fill the kettle base, water plants, or wash dishes. Bottle a pitcher of flushed water for the fridge and you have solved most of the day's exposure.
A filter does not replace flushing. A filter treats the water that reaches it; flushing stops the worst water from reaching the filter at all.
What to look for in a filter
Look for an NSF/ANSI 53 claim that names lead on the exact model. Filter housings and cartridges are certified as a set, so reorder the same cartridge family.
Pitchers: some carry a 53 lead claim, but capacity is small. Check the rated gallons against how much water you actually drink.
Faucet-mount and under-sink: usually the best balance of capacity and flow for a lead concern, and both leave counter space intact.
Reverse osmosis (NSF/ANSI 58) also reduces lead and is worth considering if you are already looking for a broader health-contaminant system.
If the utility is replacing the line
Replacement work disturbs the line and can raise lead at the tap for weeks. Flush after any work, and keep using certified filtration through the transition.
Ask whether the utility is replacing the full line or only the public side; a partial replacement can leave the private side — often the source — untouched.
Retest your tap water after the work is finished. Numbers before and after are the only way to know whether the fix reached your kitchen.
FAQ
Quick answers
+Do I need a whole-house filter for lead?
Usually not. Lead is a drinking-water concern, and point-of-use filtration at the kitchen tap costs far less than treating every gallon used for laundry and toilets.
+Does boiling remove lead?
No. Boiling does not remove lead and slightly concentrates it as water evaporates. Flush, filter, and use cold water instead.
+How do I know if I have a lead service line?
The utility's inventory or a scratch test on the pipe where it enters the house is the usual answer. Many utilities publish their inventories or will check on request.