Soil from Exterior Lead Paint
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Why are we concerned about exposure to lead?
Dust or chips from lead paint can easily poison children. If children
play in areas that contain lead paint chips or dust, they can get lead
dust on their fingers and toys. Since children frequently put their hands
in their mouth and if they have been exposed to lead dust, they will
swallow lead dust. This can cause problems with learning and growth in
children ages 6 years and under. Because they are vulnerable, even small
amounts of lead can be harmful.
How did lead get into my soil?
The most common way for lead to get into soil is from exterior house
lead paint. If your home was built before 1978, it most likely has some
lead in the paint. If your home was built before 1950, the paint contains
more lead. Lead paint can be a danger to your children if the paint is
chipped, peeling, cracked or chalking; or when repairing or remodeling
disturbs it. Approximately 37% of the one million homes in
some lead paint.
Due to natural weathering over time, paint dust and chips fall to the
ground at the base of the home. When owners scrape off the old paint in
preparation for repainting, this too can contaminate the soil. This
contaminated area, known as the drip zone (the area where old paint
dust and chips has fallen), can contain lead levels as high as some
industrial contamination sites.
Keep other sources of lead such as fishing sinkers, ammunition, and
solder out of reach of small children.
How do I know if there is lead in my soil?
If you have an older home and you can see paint chips in the soil next
to your home, you may have a lead problem. However, the only way to know
if your soil contains lead is to test the soil for lead. Many
environmental testing laboratories offer lead soil testing for a small
fee. They can provide you with recommendations on how to collect the
sample. If you feel your soil may have been contaminated with lead but you
do not wish to sample your soil, you may still take the steps listed below
to reduce or prevent exposures.
- Call 1-800-424-LEAD for a list of labs and costs for lead soil
What do the different levels of lead in soil mean?
When a soil sample is collected for lead the results are usually
reported as a number of milligrams per kilogram (mg/Kg), or parts per
million (ppm). These units mean the same thing for soils. The
Environmental Protection Agency (EPA) recommends that lead in soils not
exceed 400 ppm in bare (i.e. no grass or gravel covered) soils where
children may play, and below 1200 ppm in other parts of the yard used less
In areas children play, a higher level of lead in bare soil can mean a
higher risk of lead poisoning to children. If you think your soil may be
contaminated with lead, keep your children out of bare soil unless you
have it tested and know it is safe.
How can I reduce my family’s exposure to exterior lead in soils?
There are several ways to prevent or reduce exposure to lead in soils.
Homeowners will need to identify which method(s) work best for their home:
- Hardy shrubs can be planted around the house to keep children out of
the drip zone.
- Maintain healthy lawns without open bare soil areas.
- Locate play areas and gardens away from the drip zone of your house
- Mulch, wood chips, or gravel can be used as covering over soil in
the drip zone
- Walkways should consist of stepping stones, cement, or gravel to
prevent tracking soil inside
- A thin layer of the most heavily contaminated soils (lead over 5,000
ppm) may need to be removed and taken to a landfill.
In cases where a lot of paint is visible in the bare soil and yard,
consider the following:
- Rake up and dispose all visible chips
- Mow the grass/soil with a thatching blade and collection bag;
- Use a HEPA vacuum to collect visible chips from the surface before
other treatment options
- Install fencing that separates play areas from buildings with lead
paint. This can aid as a temporary solution.
To reduce hazards from lead from automobile exhaust, maintain grass
cover and discourage children from playing in areas near roadways.
For more information, see our
What precautions should I take while working on exterior lead paint?
Because of lead contamination issues, it is important to maintain the
painted surface of a home. If you need to remove lead paint from an
existing surface, lead paint should never be machine sanded, ground, or
blasted (water or sand) unless the equipment is equipped with HEPA vacuum
dust collection system. Never remove paint using heat or open flame. These
methods generate large amounts of contamination for both residents and
also poisoning of the painters.
Certified lead risk assessors and removal contractors can be hired for
lead paint removal and clean up.
For more information
- For information on Lead Safe Housing, see our
- For health related questions, contact the Division of Public Health, Bureau of
Environmental and Occupational Health,
PO Box 2659, Madison, WI 53701-2659
- Contact your Local Public
- For a list of certified lead risk assessors and contractors,
call (608) 261-6876
- Other resources: Maintaining a Lead Safe Home, by Dennis
Livingston is a good resource available through all Wisconsin public
library systems. The US Department of Housing and Urban Development
offers a free book, "Lead Paint Safety, A field Guide for
Painting, Home Maintenance and Renovation Work." Call
1-800-424-LEAD for a copy.
Back to Lead index page
November 07, 2012