Lead in Your Drinking Water
By David L. Russell, PE, ASP
Global Environmental Operations, Inc. (Lilburn, GA)
Lead is a slow-acting poison with no safe exposure level. Children and pregnant women are especially vulnerable. From the Romans storing wine in lead containers to modern plumbing systems, lead contamination has threatened human health for millennia.
The Water Risk
Water contributes 10-20% of total lead exposure for most people, but 40-60% for formula-fed infants who consume more water relative to body weight. Lead enters drinking water from old service lines, lead-soldered copper pipes (common in homes built 1983-1986), and plumbing fixtures.
The EPA limits lead in drinking water to 15 parts per billion (ppb), but even this level poses health risks. Check your water supplier’s annual Consumer Confidence Report. If you have well water, test it directly.
When to Install a Lead Removal System
Install a system if your water tests above 5 ppb, you have lead service lines or lead-soldered plumbing, if you have infants or young children, if you’re planning pregnancy, or if your utility has had lead issues.
Solutions
Immediate Actions
- Flush taps 30-60 seconds before using water for drinking or cooking, especially first
thing in the morning - Use only cold water for consumption (hot water leaches more lead)
- Replace lead service lines if present
System Features to Look For
- NSF/ANSI 53 or 58 certification specifically for lead
- Reputable manufacturer with good warranty
- Clear filter replacement schedule and reminders
- Easy-to-obtain replacement parts
Filtration Systems
- Reverse Osmosis (Best Performance)
- Reduces lead from 100+ ppb to <1 ppb. Under-sink installation includes pre-filters,
storage tank, and dedicated faucet. - Pros: Removes virtually all lead plus arsenic, nitrates, fluoride, and dissolved minerals.
Proven, reliable technology. - Cons: Wastes 3-4 gallons per gallon filtered (newer models more efficient). Removes
beneficial minerals. Membrane replacement every 2-3 years. Slow processing, reduced
water pressure.
- Reduces lead from 100+ ppb to <1 ppb. Under-sink installation includes pre-filters,
- Nanofiltration
- Removes 80-98% of lead, effective down to 2 ppb. Similar to RO but requires less pressure.
- Pros: Less water waste than RO. Retains some beneficial minerals. Lower operating pressure.
- Cons: Less common residentially. Higher installation cost. Periodic membrane replacement. May not achieve satisfactory results if lead levels are very high.
- Ion Exchange (Whole House)
- Similar to water softeners. Removes up to 95% of lead. Some softener systems already include lead removal. Requires periodic regeneration using sodium or potassium salt, which may add noticeable taste and sodium chloride to your water.
- Ultrafiltration
- Generally not effective for lead removal. If considering, require certified test results from manufacturer.
What to Buy
Required Certifications
- NSF/ANSI Standard 53: Certifies lead reduction to ≤10 ppb from 150 ppb influent
- NSF/ANSI Standard 58: Specific to RO systems for health contaminants
- NSF/ANSI Standard 62: Components don’t leach lead
Brands with good track records: APEC, iSpring, Waterdrop, Home Master (not endorsements, but these appear consistently in independent testing).
Installation and Maintenance
Installation
- Follow manufacturer instructions precisely. Ensure secure connections. Point-of-use systems (under-sink, faucet-mounted) treat water at a single tap—most practical for lead removal. Whole house systems cost more and may be less effective if you have old copper piping delivering treated water to taps.
Maintenance
Do not exceed scheduled maintenance intervals:
- RO membranes: every 2-3 years
- Pre-filters: every 6-12 months
- Post-filters: every 12 months
Hard water or high sediment reduces membrane life. Systems with high flow rates are less effective at lead removal. Consider pre-treatment if needed.
Testing
Test water even with a certified system:
- Before installation (establish baseline)
- 1-2 weeks after installation
- Annually or after filter changes
- Use EPA-certified lab or quality home test kit
Costs
Under-sink systems start around $400. Annual maintenance (filter replacements) runs $150-300. Whole house systems cost significantly more.
Need Help Interpreting Results or Selecting a Treatment Approach?
Global Environmental Operations, Inc. (Lilburn, GA) provides practical guidance on water quality, treatment options, and risk reduction, along with related services including Water Systems, Wastewater Treatment, Hazardous Waste and Site Remediation, Air Pollution Control, and Legal Consulting. Contact David L. Russell, PE, ASP