Lead in Water: A Guide for Owners of Pre-1986 Homes

Why 1986 Is the Cutoff

The Safe Drinking Water Act amendments of 1986 banned lead solder in plumbing. Before that date, 50/50 lead-tin solder was the industry standard for joining copper pipes. Lead service lines (the pipe connecting your home to the water main) were also common before 1986, particularly in northeastern and midwestern cities built during the early-to-mid 1900s.

If your home was built before 1986, there is a reasonable probability that lead is leaching into your drinking water. The EPA estimates that 6-10 million lead service lines remain in use across the United States. Even homes built between 1986 and 2014 may have "lead-free" brass fittings that contain up to 8% lead (the definition of "lead-free" was tightened to 0.25% in 2014).

How Lead Gets Into Your Water

Lead does not typically come from the water supply itself. It leaches from plumbing materials inside your home and in the service line connecting your home to the water main. Several factors accelerate leaching:

• Acidic water (low pH): Water below pH 7.0 is more corrosive and dissolves lead faster
• Soft water: Water with low mineral content is more aggressive toward lead solder and pipes
• Hot water: Heat increases lead dissolution. This is why you should never use hot tap water for cooking or drinking
• Stagnation: Water sitting in lead pipes for hours absorbs more lead. First-draw morning water has the highest concentrations
• New plumbing work: Disturbing old pipes during renovations can dislodge lead particles and expose fresh lead surfaces

EPA Standards and Health Effects

The EPA\'s Lead and Copper Rule sets an action level of 15 ppb (parts per billion) at the tap. This is not a safety threshold; it is a regulatory trigger. If more than 10% of samples in a water system exceed 15 ppb, the utility must take corrective action. The EPA has stated that there is no safe level of lead exposure, particularly for children.

Lead Level (ppb)	Context
0 ppb	EPA\'s stated goal; no safe level of lead
1-5 ppb	Common in older homes; low but not zero risk
5-15 ppb	Elevated; filtration recommended, especially with children
15 ppb	EPA action level; utility must respond if 10%+ of samples exceed
Above 15 ppb	Significant exposure; immediate filtration or alternative water source recommended

Health effects

Lead exposure is most dangerous for children under 6 and pregnant women. In children, lead affects brain development, causing reduced IQ, learning disabilities, behavioral problems, and slowed growth. In adults, chronic exposure contributes to high blood pressure, kidney damage, and reproductive problems. The CDC sets the blood lead reference value for children at 3.5 micrograms per deciliter.

How to Test for Lead

First-draw sampling

The most accurate way to test for lead is a first-draw sample. Collect the first liter of water from your kitchen cold tap after at least 6 hours of no water use (first thing in the morning is ideal). This water has been sitting in contact with lead solder and pipes overnight, representing the highest lead concentration you would encounter.

Flush sampling

After collecting the first-draw sample, let the water run for 2-3 minutes and collect a second sample. This "flushed" sample represents water that has been flowing through the pipes and typically has much lower lead. Comparing the two tells you whether the lead source is inside your home (first-draw high, flush low) or in the service line (both elevated).

Where to get tested

• Your water utility: Many utilities offer free or low-cost lead testing. Call and ask
• State-certified labs: The EPA maintains a list of certified labs by state at epa.gov. Costs $20-50 per sample
• Home test kits: Strip tests detect lead but are not as precise as lab analysis. They can tell you if lead is present but not the exact concentration. Use them as a screening tool, not a final answer

For detailed testing instructions, see our water testing guide.

Immediate Steps to Reduce Exposure

While you wait for test results or filter installation, these steps reduce lead exposure right away:

• Flush before use: Run cold water for 30 seconds to 2 minutes before drinking or cooking. This clears water that has been sitting in contact with lead
• Use cold water only: Never use hot tap water for cooking, drinking, or preparing baby formula. Hot water dissolves more lead from pipes
• Clean aerators: Unscrew faucet aerator screens monthly and clean out sediment. Lead particles accumulate in these screens
• Do not boil to remove lead: Boiling concentrates lead by evaporating water. It makes the problem worse

Filtration: The Most Effective Home Solution

Point-of-use filters certified to NSF/ANSI Standard 53 for lead removal are the most reliable home solution. These filters must reduce lead from 150 ppb to below 10 ppb to earn certification.

Filter options

Filter Type	Lead Removal	Cost	Filter Life	Best For
Under-sink carbon block	99%+	$100-250	6-12 months	Permanent installation for drinking/cooking
Under-sink reverse osmosis	99%+	$150-400	Membrane: 2-3 years	Multi-contaminant removal including lead
Faucet-mount filter	97-99%	$25-50	2-3 months	Quick, affordable, no installation
Certified pitcher (Brita, PUR)	96-99%	$25-40	2 months	Renters or temporary solution

Unlike PFAS, lead is effectively removed by many common filters. The key is NSF 53 certification. Check that the specific model and cartridge are certified, not just the brand name. Visit our under-sink filter guide for specific recommendations.

Lead Service Line Replacement

If your home has a lead service line (the pipe from the water main to your house), filtration addresses the symptoms but not the root cause. The EPA\'s revised Lead and Copper Rule (effective 2024) requires water systems to replace lead service lines over a 10-year period. Contact your water utility to find out:

• Whether your service line is lead, copper, or galvanized steel
• If there is a replacement program and when your neighborhood is scheduled
• Whether the utility covers the full replacement cost or only their portion (the line from the main to the property boundary)

Private-side replacement (from the property boundary to your home) can cost $3,000-8,000. Some utilities and state programs offer financial assistance.

Check Your City

Check your city\'s water to see lead testing results from your water system. Keep in mind that system-wide results may not reflect what is happening inside your specific home. If your home was built before 1986, test your own tap water regardless of what the city report shows. For more detailed information, see our full lead guide.