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California Blood Lead Data, 2019

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​Number of Individual Children Screened for Lead, by California Local Health Jurisdiction and Highest Level, 2019 (Table)

Number of Individual Children Screened for Lead, by California Local Health Jurisdiction and Highest Level, 2019

Local Health Jurisdiction Age Group (Years)  Blood Lead Level (BLL) <4.5 n  BLL <4.5 % (row)  BLL≥4.5 to <9.5 n  BLL ≥4.5 to <9.5 % (row)  BLL≥9.5 n  BLL ≥9.5 %(row)  Totals 
Alameda Age < 6         16,176 98.16%               229 1.39%                 74 0.45%         16,479
Age 6 to 21            2,549 97.59%                 49 1.88%                 14 0.54%            2,612
Local Total age < 21         18,725 98.08%               278 1.46%                 88 0.46%         19,091
Alpine Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Amador Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                421
Berkeley Age < 6               511 98.27%                   8 1.54%                   1 0.19%               520
Age 6 to 21                 42 97.67%                   1 2.33%  --  --                 43
  Local Total age < 21               553 98.22%                   9 1.60%                   1 0.18%               563
Butte Age < 6            1,679 99.35%                   8 0.47%                   3 0.18%            1,690
Age 6 to 21                 52 94.55%                   3 5.45%  --  --                 55
Local Total age < 21            1,731 99.20%                 11 0.63%                   3 0.17%            1,745
Calaveras Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                380
Colusa Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                349
Contra Costa Age < 6            7,337 98.88%                 66 0.89%                 17 0.23%            7,420
Age 6 to 21               840 98.02%                 15 1.75%                   2 0.23%               857
  Local Total age < 21            8,177 98.79%                 81 0.98%                 19 0.23%            8,277
Del Norte Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                260
El Dorado Age < 6               508 96.03%                 19 3.59%                   2 0.38%               529
Age 6 to 21                 64 98.46%                   1 1.54%  --  --                 65
  Local Total age < 21               572 96.30%                 20 3.37%                   2 0.34%               594
Fresno Age < 6         14,468 98.00%               249 1.69%                 47 0.32%         14,764
Age 6 to 21            1,848 97.83%                 34 1.80%                   7 0.37%            1,889
Local Total age < 21         16,316 97.98%               283 1.70%                 54 0.32%         16,653
Glenn Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                419
Humboldt Age < 6            2,048 95.26%                 91 4.23%                 11 0.51%            2,150
Age 6 to 21                 98 96.08%                   4 3.92%  --  --               102
  Local Total age < 21            2,146 95.29%                 95 4.22%                 11 0.49%            2,252
Imperial Age < 6            5,274 98.78%                 49 0.92%                 16 0.30%            5,339
Age 6 to 21               464 99.78%                   1 0.22%  --  --               465
  Local Total age < 21            5,738 98.86%                 50 0.86%                 16 0.28%            5,804
Inyo Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Kern Age < 6         17,878 98.80%               182 1.01%                 36 0.20%         18,096
Age 6 to 21            1,312 97.98%                 19 1.42%                   8 0.60%            1,339
  Local Total age < 21         19,190 98.74%               201 1.03%                 44 0.23%         19,435
Kings Age < 6            2,005 97.71%                 39 1.90%                   8 0.39%            2,052
Age 6 to 21                 61 98.39%                   1 1.61%  --  --                 62
  Local Total age < 21            2,066 97.73%                 40 1.89%                   8 0.38%            2,114
Lake Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                497
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                  15
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                512
Lassen Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                134
Long Beach Age < 6            5,666 99.28%                 33 0.58%                   8 0.14%            5,707
Age 6 to 21               442 99.33%                   2 0.45%                   1 0.22%               445
  Local Total age < 21            6,108 99.28%                 35 0.57%                   9 0.15%            6,152
Los Angeles Age < 6       122,807 98.96%            1,066 0.86%               227 0.18%       124,100
Age 6 to 21         16,917 98.46%               197 1.15%                 67 0.39%         17,181
  Local Total age < 21       139,724 98.90%            1,263 0.89%               294 0.21%       141,281
Madera Age < 6            4,040 97.89%                 70 1.70%                 17 0.41%            4,127
Age 6 to 21               403 98.53%                   4 0.98%                   2 0.49%               409
  Local Total age < 21            4,443 97.95%                 74 1.63%                 19 0.42%            4,536
Marin Age < 6            1,958 98.54%                 23 1.16%                   6 0.30%            1,987
Age 6 to 21               262 97.04%                   5 1.85%                   3 1.11%               270
  Local Total age < 21            2,220 98.36%                 28 1.24%                   9 0.40%            2,257
Mariposa Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                  91
Mendocino Age < 6            1,117 97.73%  Suppressed   Suppressed   Suppressed   Suppressed             1,143
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                  56
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed             1,199
Merced Age < 6            3,434 98.73%                 35 1.01%                   9 0.26%            3,478
Age 6 to 21               216 98.63%                   2 0.91%                   1 0.46%               219
  Local Total age < 21            3,650 98.73%                 37 1.00%                 10 0.27%            3,697
Modoc Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Mono Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Monterey Age < 6            7,620 98.32%                 92 1.19%                 38 0.49%            7,750
Age 6 to 21               908 96.39%                 21 2.23%                 13 1.38%               942
  Local Total age < 21            8,528 98.11%               113 1.30%                 51 0.59%            8,692
Napa Age < 6               893 99.33%                   6 0.67%  --  --               899
Age 6 to 21                 57 96.61%                   1 1.69%                   1 1.69%                 59
  Local Total age < 21               950 99.16%                   7 0.73%                   1 0.10%               958
Nevada Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                259
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                  18
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                277
Orange Age < 6         31,105 99.09%               234 0.75%                 52 0.17%         31,391
Age 6 to 21            3,430 99.16%                 24 0.69%                   5 0.14%            3,459
  Local Total age < 21         34,535 99.10%               258 0.74%                 57 0.16%         34,850
Pasadena Age < 6            1,309 99.17%                   7 0.53%                   4 0.30%            1,320
Age 6 to 21               133 100.00%  --  --  --  --               133
  Local Total age < 21            1,442 99.24%                   7 0.48%                   4 0.28%            1,453
Placer Age < 6            1,171 98.57%                 14 1.18%                   3 0.25%            1,188
Age 6 to 21               133 99.25%                   1 0.75%  --  --               134
  Local Total age < 21            1,304 98.64%                 15 1.13%                   3 0.23%            1,322
Plumas Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Riverside Age < 6         34,688 99.47%               147 0.42%                 38 0.11%         34,873
Age 6 to 21            2,278 99.22%                 12 0.52%                   6 0.26%            2,296
  Local Total age < 21         36,966 99.45%               159 0.43%                 44 0.12%         37,169
Sacramento Age < 6         15,801 97.11%               361 2.22%               109 0.67%         16,271
Age 6 to 21            1,807 83.89%               282 13.09%                 65 3.02%            2,154
  Local Total age < 21         17,608 95.57%               643 3.49%               174 0.94%         18,425
San Benito Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                786
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                  36
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                822
San Bernardino Age < 6         32,869 99.29%               192 0.58%                 42 0.13%         33,103
Age 6 to 21            2,835 99.30%                 16 0.56%                   4 0.14%            2,855
  Local Total age < 21         35,704 99.29%               208 0.58%                 46 0.13%         35,958
San Diego Age < 6         40,829 98.97%               337 0.82%                 87 0.21%         41,253
Age 6 to 21            2,127 96.51%                 55 2.50%                 22 1.00%            2,204
  Local Total age < 21         42,956 98.85%               392 0.90%               109 0.25%         43,457
San Francisco Age < 6            8,368 98.18%               123 1.44%                 32 0.38%            8,523
Age 6 to 21            1,268 98.29%                 18 1.40%                   4 0.31%            1,290
  Local Total age < 21            9,636 98.20%               141 1.44%                 36 0.37%            9,813
San Joaquin Age < 6         11,373 98.97%                 80 0.70%                 38 0.33%         11,491
Age 6 to 21               783 98.49%                   9 1.13%                   3 0.38%               795
  Local Total age < 21         12,156 98.94%                 89 0.72%                 41 0.33%         12,286
San Luis Obispo Age < 6            1,304 98.86%                 14 1.06%                   1 0.08%            1,319
Age 6 to 21                 49 94.23%                   2 3.85%                   1 1.92%                 52
  Local Total age < 21            1,353 98.69%                 16 1.17%                   2 0.15%            1,371
San Mateo Age < 6            5,933 98.64%                 66 1.10%                 16 0.27%            6,015
Age 6 to 21               671 97.53%                 16 2.33%                   1 0.15%               688
  Local Total age < 21            6,604 98.52%                 82 1.22%                 17 0.25%            6,703
Santa Barbara Age < 6            5,690 98.89%                 49 0.85%                 15 0.26%            5,754
Age 6 to 21               278 95.86%                   9 3.10%                   3 1.03%               290
  Local Total age < 21            5,968 98.74%                 58 0.96%                 18 0.30%            6,044
Santa Clara Age < 6         18,976 98.59%               209 1.09%                 62 0.32%         19,247
Age 6 to 21            2,543 96.84%                 68 2.59%                 15 0.57%            2,626
  Local Total age < 21         21,519 98.38%               277 1.27%                 77 0.35%         21,873
Santa Cruz Age < 6            2,300 98.16%                 32 1.37%                 11 0.47%            2,343
Age 6 to 21               317 97.24%                   8 2.45%                   1 0.31%               326
  Local Total age < 21            2,617 98.05%                 40 1.50%                 12 0.45%            2,669
Shasta Age < 6               529 98.51%                   7 1.30%                   1 0.19%               537
Age 6 to 21                 26 100.00%  --  --  --  --                 26
  Local Total age < 21               555 98.58%                   7 1.24%                   1 0.18%               563
Sierra Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Siskiyou Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                175
Solano Age < 6            4,396 97.91%                 83 1.85%                 11 0.24%            4,490
Age 6 to 21               196 95.61%                   9 4.39%  --  --               205
  Local Total age < 21            4,592 97.81%                 92 1.96%                 11 0.23%            4,695
Sonoma Age < 6            2,799 99.36%                 12 0.43%                   6 0.21%            2,817
Age 6 to 21               367 98.66%                   3 0.81%                   2 0.54%               372
  Local Total age < 21            3,166 99.28%                 15 0.47%                   8 0.25%            3,189
Stanislaus Age < 6            7,089 98.94%                 62 0.87%                 14 0.20%            7,165
Age 6 to 21               662 93.90%                 35 4.96%                   8 1.13%               705
  Local Total age < 21            7,751 98.49%                 97 1.23%                 22 0.28%            7,870
Sutter Age < 6            1,328 98.88%  Suppressed   Suppressed   Suppressed   Suppressed             1,343
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                  83
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed             1,426
Tehama Age < 6            1,506 99.01%  Suppressed   Suppressed   Suppressed   Suppressed             1,521
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                  61
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed             1,582
Trinity Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Tulare Age < 6            6,166 98.09%               102 1.62%                 18 0.29%            6,286
Age 6 to 21               280 98.25%                   3 1.05%                   2 0.70%               285
  Local Total age < 21            6,446 98.10%               105 1.60%                 20 0.30%            6,571
Tuolumne Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                444
Ventura Age < 6            9,241 99.53%                 32 0.34%                 12 0.13%            9,285
Age 6 to 21               551 99.28%                   4 0.72%  --  --               555
  Local Total age < 21            9,792 99.51%                 36 0.37%                 12 0.12%            9,840
Yolo Age < 6            2,144 97.99%                 34 1.55%                 10 0.46%            2,188
Age 6 to 21                 90 98.90%                   1 1.10%  --  --                 91
  Local Total age < 21            2,234 98.03%                 35 1.54%                 10 0.44%            2,279
Yuba Age < 6  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
Age 6 to 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed 
  Local Total age < 21  Suppressed   Suppressed   Suppressed   Suppressed   Suppressed   Suppressed                990
 CLPPB Age < 6                 61 100.00%  --  --  --  --                 61
Age 6 to 21                 19 100.00%  --  --  --  --                 19
  Local Total age < 21                 80 100.00%  --  --  --  --                 80
California Totals Age < 6       467,693 98.80%            4,575 0.97%            1,128 0.24%       473,396
Age 6 to 21         47,884 97.54%               948 1.93%               262 0.53%         49,094
  Local Total age < 21       515,577 98.68%            5,523 1.06%            1,390 0.27%       522,490

  • Data are from the RASSCLE surveillance database archive of 3/2/2021.
  • Each individual is counted only once, using their highest blood lead level (BLL) during 2019.
  • Measures are in micrograms per deciliter (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.”
  • 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 2019 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 mcg/dL or Greater, by California Local Health Jurisdiction, 2019

Map 1: Percent of Children Under 6 with a Blood Lead Level of 4
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, Nevada, Plumas, San Benito, Sierra, Siskiyou, Trinity, Tuolumne and Yuba.

  • Data are from the RASSCLE surveillance database archive of 3/2/2021.
  • Each individual is counted only once, using their highest blood lead level (BLL) during 2019.
  • Measures are in micrograms per deciliter (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 as "< 5 mcg/dL" from an analyzing laboratory that routinely reported "< 5 mcg/dL" as their limit of detection in 2019 are included in the category "BLL < 4.5 mcg/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 2019 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 1 for data table.

​​Table 1. California Local Health Jurisdictions, by Percent of Children Under 6 Years Old with a Blood Lead Level of 4.5 mcg/dLor Greater, in Descending Order, 2019

Local Health JurisdictionBLL < 4.5 nBLL < 4.5 % (row)BLL ≥ 4.5 nBLL ≥ 4.5 % (row)Total number of children under 6 screened
Humboldt2,04895.26%1024.74%2,150
El Dorado50896.03%213.97%529
Sacramento15,80197.11%4702.89%16,271
Kings2,00597.71%472.29%2,052
Mendocino1,11797.73%262.27%1,143
Madera4,04097.89%872.11%4,127
Solano4,39697.91%942.09%4,490
Yolo2,14497.99%442.01%2,188
Fresno14,46898.00%2962.00%14,764
Tulare6,16698.09%1201.91%6,286
Alameda16,17698.16%3031.84%16,479
Santa Cruz2,30098.16%431.84%2,343
San Francisco8,36898.18%1551.82%8,523
Berkeley51198.27%
91.73%520
Monterey7,62098.32%1301.68%7,750
Suppressed Jurisdictions5,29998.46%831.54%
5,382
Shasta52998.51%81.49%537
Marin1,95898.54%291.46%1,987
Placer1,17198.57%171.43%1,188
Santa Clara18,97698.59%2711.41%19,247
San Mateo5,93398.64%821.36%6,015
Merced3,43498.73%441.27%3,478
Imperial5,27498.78%651.22%5,339
Kern17,87898.80%2181.20%18,096
San Luis Obispo1,30498.86%151.14%1,319
Contra Costa7,33798.88%831.12%7,420
Sutter1,32898.88%151.12%1,343
Santa Barbara5,69098.89%641.11%5,754
Stanislaus7,08998.94%761.06%7,165
Los Angeles122,80798.96%1,2931.04%124,100
San Diego40,82998.97%4241.03%41,253
San Joaquin11,37398.97%1181.03%11,491
Tehama1,50699.01%150.99%1,521
Orange31,10599.09%2860.91%31,391
Pasadena1,30999.17%110.83%1,320
Long Beach5,66699.28%41
0.72%5,707
San Bernardino32,86999.29%2340.71%33,103
Napa89399.33%60.67%899
Butte1,67999.35%110.65%1,690
Sonoma2,79999.36%180.64%2,817
Riverside34,68899.47%1850.53%34,873
Ventura9,24199.53%440.47%9,285
Tests with unknown jurisdictions61100.00%00.00%61
California Totals467,69398.80%5,7031.20%473,396

Notes for BLL data:

  • Data are from the RASSCLE surveillance database archive of 3/2/2021.
  • Each individual is counted only once, using their highest blood lead level (BLL) during 2019.
  • Measures are in micrograms per deciliter (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 as "< 5 mcg/dL" from an analyzing laboratory that routinely reported "< 5 mcg/dL" as their limit of detection in 2019 are included in the category "BLL < 4.5 mcg/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 2019 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.

Map 2: Percent of Children Under 6 Years Old with a Blood Lead Level of 9.5 mcg/dL or Greater, by California Local Health Jurisdiction, 2019

Map 2: Percent of Children Under 6 with a Blood Lead Level of 9

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, Mendocino, Modoc, Mono, Nevada, Plumas, San Benito, Sierra, Siskiyou, Sutter, Tehama, Trinity, Tuolumne, and Yuba.

  • Data are from the RASSCLE surveillance database archive of 3/2/2021.
  • Each individual is counted only once, using their highest blood lead level (BLL) during 2019.
  • Measures are in micrograms per deciliter (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.
  • 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 jurisdictions that did not have enough blood lead tests in 2019 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.

Table2. 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, 2019

Local Health JurisdictionBLL < 9.5 nBLL < 9.5 % (row)BLL ≥ 9.5 nBLL ≥ 9.5 % (row)Totals
Sacramento16,162
99.33%1090.67%16,271
Humboldt2,13999.49%110.51%2,150
Monterey7,71299.51%380.49%7,750
Santa Cruz2,33299.53%110.47%2,343
Yolo2,17899.54%100.46%2,188
Alameda16,40599.55%740.45%16,479
Madera4,11099.59%170.41%4,127
Kings2,04499.61%80.39%2,052
El Dorado52799.62%20.38%529
San Francisco8,49199.62%320.38%8,523
San Joaquin11,45399.67%380.33%11,491
Fresno14,71799.68%47
0.32%14,764
Santa Clara19,18599.68%620.32%19,247
Imperial5,32399.70%160.30%5,339
Marin1,98199.70%60.30%1,987
Pasadena1,31699.70%40.30%1,320
Tulare6,26899.71%180.29%6,286
Suppressed Jurisdictions9,36399.72%260.28%9,389
San Mateo5,99999.73%160.27%6,015
Merced3,46999.74%90.26%3,478
Santa Barbara5,73999.74%150.26%5,754
Placer1,18599.75%30.25%1,188
Solano4,47999.76%110.24%4,490
Contra Costa7,40399.77%170.23%7,420
San Diego41,16699.79%870.21%41,253
Sonoma2,81199.79%60.21%2,817
Kern18,06099.80%360.20%18,096
Stanislaus7,15199.80%140.20%7,165
Berkeley51999.81%10.19%520
Shasta53699.81%10.19%537
Butte1,68799.82%30.18%1,690
Los Angeles123,87399.82%2270.18%124,100
Orange31,33999.83%520.17%31,391
Long Beach5,69999.86%80.14%5,707
San Bernardino33,06199.87%420.13%33,103
Ventura9,27399.87%120.13%9,285
Riverside34,83599.89%380.11%34,873
San Luis Obispo1,31899.92%10.08%1,319
Napa899100.00%00.00%899
Tests with unknown jurisdictions61100.00%00.00%61
California Totals472,26899.76%1,1280.24%473,396

Notes for BLL data:

  • Data are from the RASSCLE surveillance database archive of 3/2/2021.
  • Each individual is counted only once, using their highest blood lead level (BLL) during 2019.
  • Measures are in micrograms per deciliter (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.
  • 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 2019 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, Mendocino, Modoc, Mono, Nevada, Plumas, San Benito, Sierra, Siskiyou, Sutter, Tehama, Trinity, Tuolumne, and Yuba.

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