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, 2018

Data are suppressed for local health jurisdictions that did not meet the California Health and Human Service 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, San Benito, Sierra, Siskiyou, Trinity, Tuolumne and Yuba.

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, with Estimates of Children in Medi-Cal and Total Population, 2018

Notes for BLL data:

• Data are from the RASSCLE surveillance database archive of 4/3/2019. Analysis was completed on 12/11/2019.
• Each individual is counted only once, using their highest BLL during 2018.
• 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 jurisdiction at the time of their highest BLL is the one counted. 
• Patient jurisdiction is determined by geocoding the address associated with the child's highest BLL and spatially joining it to a jurisdiction boundary layer. This analysis used the Web Mercator Auxiliary Sphere projection.
• Data are suppressed for local health jurisdictions that did not have enough blood lead tests in 2018 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.
• Notes for estimates of number of children on Medi-Cal and number of children under 6 in California for 2018:
• The estimate of the number of children under 6 was based on the California Department of Finance County Population Projections by Age. We also created estimates for the following cities: Berkeley, Long Beach, and Pasadena,
• The estimate of the number of children on Medi-Cal in 2018 were based on the percentage of under 6-year-olds that are on Medicaid were based on the 2013-2017 American Community Survey (ACS; 5-Year Estimates).
• The smallest geographic areas in the available ACS data were Public Use Microdata Areas (PUMAs). Since PUMAs must contain at least 100,000 people, some counties are grouped together in one PUMA. Therefore, we do not have estimates for several individual counties. We did not try to create estimates for the following cities: Berkeley, Long Beach, and Pasadena.
• For some of the smaller geographies, we have less certainty of the percentage. Confidence intervals were calculated but are not shown in the table.
  

Table 2. California Local Health Jurisdictions, by Percent of Children Under 6 Years Old with a Blood Lead Level of 9.5 mcg/dL or Greater, in Descending Order, 2018

• Data are from the RASSCLE surveillance database archive of 4/3/2019.
• Each individual is counted only once, using their highest BLL during 2018.
• 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.
• If an individual moved between two jurisdictions, then the child's jurisdiction at the time of their highest BLL is the one counted. 
• Patient jurisdiction is determined by geocoding the address associated with the child's highest BLL and spatially joining it to a jurisdiction boundary layer. This analysis used the Web Mercator Auxiliary Sphere projection.
• Data are suppressed for local health jurisdictions that did not have enough blood lead tests in 2018 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. Suppressed jurisdictions include Alpine, Amador, Calaveras, Colusa, Del Norte, Glenn, Inyo, Lake, Lassen, Mariposa, Mendocino, Modoc, Mono, Nevada, Plumas, San Benito, Sierra, Siskiyou, Sutter, Tehama, Trinity, Tuolumne, and Yuba.