2019 Texas Childhood Blood Lead Screening Guidelines (pdf) - Revised June 2020

Targeted zip codes have one or more associated census tract in which: 

• The percentage of children age 1-2 years old with a blood lead level = 5 mcg/dL is = 3% among those tested in 2016 (Prevalence), or 
• The percentage of residential structures built before 1950 is = 27% (Housing).