• Data are from the RASSCLE surveillance database archive of 1/3/2019.
• Each individual is counted only once, using their highest BLL during 2016.
• Measures are in mcg/dL of whole blood and include arterial, cord, venous, capillary, and unknown samples. Not all elevated capillary samples are confirmed by a follow-up venous sample.
• Results later determined to be false positive and errors have been excluded.
• All results of blood lead analyses are reportable under California law, and the State works to ensure complete reporting. Results that are not submitted to the State, however, would not be included here.
• Those BLLs reported from the analyzing laboratory as "<5 mcg/dL" are included in the category "BLL <4.5 mcg/dL."
• If an individual moved between two jurisdictions, then the child's residence at the time of their highest BLL is the one counted. 
• Patient jurisdiction is determined by spatially joining the XY coordinates from the patient's geocoded address for their highest BLL to a jurisdiction boundary layer.
• Data are suppressed for local health jurisdictions that did not have enough blood lead tests in 2016 to meet the California Health and Human Services Agency's Data De‑Identification Guidelines for public release. However, the California Totals include the data from suppressed jurisdictions.
  

Blood Lead Maps and Data

Map 1: Percent of Children Under 6 Years Old with a Blood Lead Level of 4.5 mcg/dL or Greater, by California Local Health Jurisdiction, 2016

Data are suppressed for local health jurisdictions that did not meet the California Health and Human Services Agency's Data De-Identification Guidelines for public release.
Suppressed jurisdictions include Alpine, Amador, Calaveras, Colusa, Del Norte, Glenn, Inyo, Lake, Lassen, Mariposa, Modoc, Mono, Plumas, Sierra, Siskiyou, Trinity, and Tuolumne.

• Data are from the RASSCLE surveillance database archive of 1/3/2019.
• Each individual is counted only once, using their highest BLL during 2016.
• Measures are in mcg/dL of whole blood and include arterial, cord, venous, capillary and unknown samples. Not all elevated capillary samples are confirmed by a follow-up venous sample.
• Results later determined to be false positive and errors have been excluded.
  
• All results of blood lead analyses are reportable under California law, and the State works to ensure complete reporting. Results that are not submitted to the State, however, would not be included here.
• Those BLLs reported from the analyzing laboratory as "<5 mcg/dL" are included in the category "BLL <4.5 mcg/dL."
• If an individual moved between two jurisdictions, then the child's residence at the time of their highest BLL is the one counted.
• Patient jurisdiction is determined by spatially joining the XY coordinates from the patient's geocoded address for their highest BLL to a jurisdiction boundary layer.
  

Table 1. California Local Health Jurisdictions, by Percent of Children Under 6 Years Old with a Blood Lead Level of 4.5 mcg/dL or Greater, in Descending Order, 2016