Number of Individual Children Screened for Lead, by California Local Health Jurisdiction and Highest, 2020

Table Notes:

• Data are from the RASSCLE surveillance database archive of 7/30/2021.
• Each individual is counted only once, using their highest blood lead level (BLL) during 2020.
• Measures are in micrograms per deciliter (µg/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 µg/dL" are included in the category "BLL < 4.5 µg/dL."
• Patient jurisdiction is determined by geocoding the address associated with the child's highest BLL using Esri's StreetMap Premium North America locator.
• Data are suppressed for local health jurisdictions that did not have enough blood lead tests in 2020 to meet the California Health and Human Services Agency's Data De-Identification Guidelines for public release.
  

Blood Lead Maps and Data

Map 1. Percent of Children Under 6 Years Old with a Blood Lead Level of 4.5 µg/dL or Greater, by California Local Health Jurisdiction, 2020

Map 1 Notes:

• Data are from the RASSCLE surveillance database archive of 7/30/2021.
• Each individual is counted only once, using their highest blood lead level (BLL) during 2020.
• Measures are in micrograms per deciliter (µg/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 positives 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 as "< 5 µg/dL" from an analyzing laboratory that routinely reported "< 5 µg/dL" as their limit of detection in 2020 are included in the category "BLL < 4.5 µg/dL".
• Patient jurisdiction is determined by geocoding the address associated with the child's highest BLL using Esri's StreetMap Premium North America locator.
• Data are suppressed for local health jurisdictions that did not have enough blood lead tests in 2020 to meet the California Health and Human Services Agency's Data De-Identification Guidelines for public release. Therefore, not all jurisdictions are shown in this map.
• Refer to Table 2 for data.
  

Table 1. California Local Health Jurisdictions, by Percent of Children Under 6 Years Old with a Blood Lead Level of 4.5 µg/dL or Greater, 2020

Table 1 Notes:

• Data are from the RASSCLE surveillance database archive of 7/30/2021.
• Each individual is counted only once, using their highest blood lead level (BLL) during 2020.
• Measures are in micrograms per deciliter (µg/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 positives 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 as "< 5 µg/dL" from an analyzing laboratory that routinely reported   "< 5 µg/dL" as their limit of detection in 2020 are included in the category "BLL < 4.5 µg/dL."
• Patient jurisdiction is determined by geocoding the address associated with the child's highest BLL using Esri's StreetMap Premium North America locator.
• Data are suppressed for local health jurisdictions that did not have enough blood lead tests in 2020 to meet the California Health and Human Services Agency's Data De-Identification Guidelines for public release. Therefore, not all jurisdictions are shown in this table. Suppressed jurisdictions include Alpine, Amador, Calaveras, Colusa, Del Norte, Glenn, Inyo, Lake, Lassen, Mariposa, Modoc, Mono, Nevada, Plumas, San Benito, Sierra, Siskiyou, Trinity, Tuolumne, and Yuba.