Environmental Public Health Tracking: Lead Poisoning Data

Lead is a naturally occurring metal. It may be found by itself or with other minerals. Lead has no nutritional value, but it is useful in manufacturing. When lead enters the body, it is toxic and at high enough levels, it can cause lead poisoning.

Lead was used in house paint until it was banned in 1978. Daily activities that create friction, such as raising and lowering painted windows or climbing porch stairs, causing an impact on painted floors and stairs, can cause lead based paint (LBP) to break down into lead-contaminated dust. Lead dust can also be created when LBP is disturbed through home renovation or repair. That dust is mostly invisible and can be ingested by a young child unknowingly.

Lead is common in industries including construction, mining, and manufacturing, where workers are at risk of being exposed to lead by breathing it in, ingesting it, or coming in contact with it. People may also come into contact with lead through other jobs and hobbies. Lead poisoning can occur when working near lead dust, lead-based products, and lead fumes. Lead dust can also be taken home on workers’ clothing, shoes, or tools, which can expose children and other household members to lead (this is called “take-home lead”).

There is no safe level of lead in the human body. Even very low levels of exposure can cause adverse health effects.

Lead poisoning is commonly determined by measuring the amount of lead in a person’s body by using a blood test. The results are measured in micrograms per deciliter (µg/dL). Wisconsin statute (Wis. Stat. § 254.11[9]) defines lead poisoning in a child as a blood lead level of 5 or more µg/dL. The CDC (Centers for Disease Control and Prevention) in 2022 updated their definition to include blood lead levels of 3.5 or more µg/dL. However, there is no safe blood lead level; even very low levels of lead exposure can cause permanent brain damage and negatively affect learning, behavior, and health throughout a child’s life. Parents who would like to have their child tested for lead poisoning should contact their doctor or the local health department. CDC recommends a blood lead level of less than 3.5 µg/dL for adults as well.

This fact sheet (PDF) provides more information about the health effects of childhood lead poisoning. Visit the Prevention and Intervention for Lead Exposure webpage for more information on childhood lead poisoning.

Wisconsin Tracking tracks lead poisoning because it is a preventable threat to adults and children. By tracking the patterns for lead poisoning, professionals can better target their resources for the best prevention strategies.

Banning lead in gasoline, paint, and other products has helped reduce how much lead we come in contact with.

Children are more likely to get lead poisoning than adults. The CDC identifies lead as the number one environmental health threat to young children. Lead poisoning in children is preventable.

Prevention efforts are focused on children younger than 6 years old because:

• Their growing bodies absorb more lead than adults.
• Their brains and nervous systems are more sensitive to the damaging effects of lead. At this age, the brain is still developing, and lead poisoning can stunt this development.
• Children crawl and put objects in their mouths. They can come into contact with any lead that is present in their environment, such as lead dust on toys or on the floor.

Tracking childhood lead poisoning will help identify:

• Lead testing and poisoning rate changes over time
• Seasonal variations
• Geographic differences
• Differences in lead testing and poisoning by age, gender, and race/ethnicity
• Populations in need of targeted interventions

The website provides data from the Adult Lead Program and the Wisconsin Childhood Lead Poisoning Prevention Program at the Wisconsin Department of Health Services.

Adult lead

• Number and rate of all adults with blood lead levels at or over 3.5, 5, 10, 25, and 40 µg/dL
• Number and rate of adults newly recorded for the year with blood lead levels at or over 3.5, 5, 10, 25, and 40 µg/dL

Rates are adults per 100,000 employed adults in the state or county. All measures are available at the state and county level.

Childhood lead poisoning

• Number of children under 6 tested for lead poisoning
• Number of children under 6 testing positive for lead poisoning (in other words, number of children poisoned)
• Percent of children under 6 poisoned by lead among those who were tested for lead

All measures are available at the state, county, and census tract level on this map.

For more boundary and map-mark options (lead contractors, municipal boundaries, local health department boundaries, and congressional districts) you can use the Childhood Lead Data Explorer map.

• The data collected are based on the number of children or adults tested and not based on all children or adults living in the state or local community.
• Data users should keep in mind that many factors contribute to a disease. These factors should be considered when interpreting the data. Factors include:
  • Demographics (race, gender, age)
  • Socioeconomic status (income level, education)
  • Geography (rural, urban)
  • Changes in the medical field (diagnosis patterns, reporting requirements)
  • Individual behavior (diet, smoking)

• Wisconsin Department of Health Services - Lead-Safe Wisconsin
• Wisconsin Department of Health Services - Adult Lead Program
• Wisconsin Department of Health Services - Children and the Environment
• Wisconsin Department of Health Services – Lead and Your Health, P-01738 (PDF)
• Wisconsin Department of Health Services - Take-Home Lead, P-01737
• Wisconsin Department of Natural Resources – Lead in Drinking Water
• U.S. Environmental Protection Agency - Lead Filter Identification Tool

Click the link below to download the data you're looking for:

• Census Tract Data (CSV)
• County Data (CSV)
• State Data (CSV)