Lead Paint Risk in San Mateo County, California
73.3%Pre-1978 Housing
209,399Pre-1978 Units
285,558Total Housing Units
174Census Tracts
How to Interpret This
This is an area-level screening signal based on Census housing-age data. It does not confirm lead paint in any specific home. Homes built before 1978 may contain lead-based paint, and certified inspection or testing is the only way to confirm a property-level hazard.
Reporter / Resident Story Kit
- 209,399 housing units in San Mateo County were built before 1978.
- The county's pre-1978 housing share is 73.3%, compared with the state rate of 56.7%.
- Local questions: Which neighborhoods have the oldest housing stock? Are lead-safe renovation resources available? Do renters and families with young children know how to request testing?
Highest-Risk Census Tracts
Individual census tracts ranked by pre-1978 housing percentage. Showing the top 100 of 174 tracts; download the full county tract CSV.
| Tract | Pre-1978 | Total | Risk Rate | 1970s | 1960s | 1950s | 1940s | ≤1939 |
|---|---|---|---|---|---|---|---|---|
| Census Tract 6116 | 796 | 796 | 100.0% | 29 | 17 | 303 | 373 | 74 |
| Census Tract 6112 | 1,052 | 1,068 | 98.5% | 9 | 68 | 859 | 116 | 0 |
| Census Tract 6069 | 883 | 902 | 97.9% | 139 | 237 | 507 | 0 | 0 |
| Census Tract 6009 | 1,470 | 1,511 | 97.3% | 9 | 205 | 963 | 281 | 12 |
| Census Tract 6120.01 | 975 | 1,003 | 97.2% | 100 | 190 | 367 | 301 | 17 |
| Census Tract 6015.01 | 1,479 | 1,523 | 97.1% | 68 | 426 | 830 | 92 | 63 |
| Census Tract 6067 | 933 | 963 | 96.9% | 210 | 105 | 425 | 156 | 37 |
| Census Tract 6010 | 2,222 | 2,316 | 95.9% | 83 | 848 | 1,259 | 0 | 32 |
| Census Tract 6065 | 1,325 | 1,382 | 95.9% | 145 | 84 | 230 | 311 | 555 |
| Census Tract 6099 | 1,075 | 1,121 | 95.9% | 26 | 127 | 232 | 306 | 384 |
| Census Tract 6071 | 1,051 | 1,100 | 95.5% | 52 | 92 | 631 | 201 | 75 |
| Census Tract 6011 | 1,945 | 2,047 | 95.0% | 188 | 115 | 1,501 | 90 | 51 |
| Census Tract 6073 | 1,241 | 1,312 | 94.6% | 118 | 59 | 471 | 560 | 33 |
| Census Tract 6004.02 | 1,253 | 1,328 | 94.4% | 126 | 98 | 122 | 175 | 732 |
| Census Tract 6007.01 | 1,310 | 1,393 | 94.0% | 187 | 176 | 135 | 215 | 597 |
| Census Tract 6016.05 | 1,813 | 1,930 | 93.9% | 989 | 731 | 33 | 22 | 38 |
| Census Tract 6101 | 858 | 915 | 93.8% | 108 | 157 | 321 | 218 | 54 |
| Census Tract 6046 | 852 | 909 | 93.7% | 63 | 370 | 402 | 11 | 6 |
| Census Tract 6085.01 | 1,687 | 1,807 | 93.4% | 100 | 134 | 815 | 604 | 34 |
| Census Tract 6094 | 1,069 | 1,148 | 93.1% | 82 | 71 | 303 | 524 | 89 |
| Census Tract 6034 | 2,039 | 2,195 | 92.9% | 1,038 | 809 | 170 | 0 | 22 |
| Census Tract 6096.02 | 579 | 623 | 92.9% | 144 | 214 | 180 | 31 | 10 |
| Census Tract 6093 | 1,132 | 1,220 | 92.8% | 30 | 48 | 296 | 616 | 142 |
| Census Tract 6040 | 1,159 | 1,257 | 92.2% | 34 | 19 | 668 | 281 | 157 |
| Census Tract 6108 | 1,506 | 1,634 | 92.2% | 316 | 424 | 459 | 137 | 170 |
| Census Tract 6077.02 | 774 | 840 | 92.1% | 14 | 54 | 618 | 80 | 8 |
| Census Tract 6016.04 | 1,208 | 1,315 | 91.9% | 975 | 216 | 0 | 0 | 17 |
| Census Tract 6033 | 2,276 | 2,481 | 91.7% | 364 | 721 | 1,120 | 71 | 0 |
| Census Tract 6038.02 | 1,940 | 2,121 | 91.5% | 217 | 288 | 1,255 | 144 | 36 |
| Census Tract 6118 | 1,044 | 1,143 | 91.3% | 84 | 49 | 797 | 91 | 23 |
| Census Tract 6051 | 1,306 | 1,441 | 90.6% | 70 | 209 | 200 | 216 | 611 |
| Census Tract 6080.02 | 1,207 | 1,335 | 90.4% | 1,098 | 101 | 8 | 0 | 0 |
| Census Tract 6109.02 | 1,209 | 1,345 | 89.9% | 261 | 74 | 339 | 316 | 219 |
| Census Tract 6041.04 | 1,186 | 1,320 | 89.8% | 252 | 183 | 282 | 288 | 181 |
| Census Tract 6078 | 1,033 | 1,153 | 89.6% | 55 | 136 | 822 | 20 | 0 |
| Census Tract 6047 | 878 | 981 | 89.5% | 151 | 182 | 316 | 209 | 20 |
| Census Tract 6072 | 1,642 | 1,835 | 89.5% | 144 | 273 | 601 | 499 | 125 |
| Census Tract 6081 | 1,165 | 1,304 | 89.3% | 371 | 743 | 51 | 0 | 0 |
| Census Tract 6091 | 538 | 606 | 88.8% | 39 | 43 | 112 | 294 | 50 |
| Census Tract 6028 | 1,392 | 1,572 | 88.5% | 284 | 940 | 157 | 0 | 11 |
| Census Tract 6058 | 856 | 970 | 88.2% | 79 | 76 | 147 | 143 | 411 |
| Census Tract 6018 | 2,032 | 2,308 | 88.0% | 40 | 157 | 1,372 | 419 | 44 |
| Census Tract 6088 | 1,911 | 2,174 | 87.9% | 265 | 821 | 678 | 114 | 33 |
| Census Tract 6039 | 2,019 | 2,301 | 87.7% | 316 | 342 | 682 | 246 | 433 |
| Census Tract 6100 | 1,792 | 2,043 | 87.7% | 246 | 240 | 445 | 197 | 664 |
| Census Tract 6017 | 1,188 | 1,363 | 87.2% | 11 | 130 | 964 | 44 | 39 |
| Census Tract 6050 | 2,745 | 3,148 | 87.2% | 269 | 1,089 | 757 | 427 | 203 |
| Census Tract 6104 | 1,378 | 1,586 | 86.9% | 184 | 285 | 315 | 550 | 44 |
| Census Tract 6038.01 | 1,102 | 1,269 | 86.8% | 920 | 131 | 43 | 0 | 8 |
| Census Tract 6042 | 970 | 1,117 | 86.8% | 82 | 180 | 323 | 306 | 79 |
| Census Tract 6037 | 1,728 | 1,993 | 86.7% | 70 | 452 | 1,107 | 99 | 0 |
| Census Tract 6060 | 2,183 | 2,519 | 86.7% | 179 | 1,042 | 620 | 265 | 77 |
| Census Tract 6053 | 1,800 | 2,078 | 86.6% | 288 | 126 | 256 | 96 | 1,034 |
| Census Tract 6006 | 1,475 | 1,710 | 86.3% | 311 | 209 | 268 | 357 | 330 |
| Census Tract 6102.01 | 1,676 | 1,942 | 86.3% | 212 | 522 | 441 | 352 | 149 |
| Census Tract 6061 | 1,285 | 1,496 | 85.9% | 184 | 197 | 359 | 533 | 12 |
| Census Tract 6052 | 1,244 | 1,456 | 85.4% | 42 | 82 | 128 | 177 | 815 |
| Census Tract 6045 | 1,180 | 1,383 | 85.3% | 145 | 183 | 343 | 482 | 27 |
| Census Tract 6087 | 2,527 | 2,963 | 85.3% | 284 | 989 | 707 | 353 | 194 |
| Census Tract 6021 | 897 | 1,054 | 85.1% | 350 | 71 | 110 | 121 | 245 |
| Census Tract 6012 | 1,832 | 2,186 | 83.8% | 110 | 343 | 537 | 742 | 100 |
| Census Tract 6014 | 1,988 | 2,372 | 83.8% | 436 | 486 | 984 | 69 | 13 |
| Census Tract 6096.03 | 1,610 | 1,933 | 83.3% | 641 | 366 | 386 | 120 | 97 |
| Census Tract 6109.01 | 1,153 | 1,384 | 83.3% | 96 | 197 | 377 | 122 | 361 |
| Census Tract 6111 | 1,906 | 2,291 | 83.2% | 255 | 273 | 1,301 | 44 | 33 |
| Census Tract 6024 | 2,300 | 2,768 | 83.1% | 166 | 451 | 827 | 819 | 37 |
| Census Tract 6098 | 1,464 | 1,764 | 83.0% | 177 | 259 | 490 | 398 | 140 |
| Census Tract 6130 | 1,266 | 1,531 | 82.7% | 492 | 667 | 82 | 13 | 12 |
| Census Tract 6080.23 | 686 | 831 | 82.6% | 573 | 100 | 6 | 7 | 0 |
| Census Tract 6041.03 | 1,265 | 1,535 | 82.4% | 75 | 193 | 327 | 249 | 421 |
| Census Tract 6105 | 1,167 | 1,418 | 82.3% | 110 | 210 | 263 | 246 | 338 |
| Census Tract 6121.01 | 1,372 | 1,691 | 81.1% | 238 | 443 | 459 | 50 | 182 |
| Census Tract 6090 | 825 | 1,018 | 81.0% | 109 | 106 | 388 | 142 | 80 |
| Census Tract 6005.02 | 993 | 1,227 | 80.9% | 521 | 35 | 390 | 24 | 23 |
| Census Tract 6049 | 990 | 1,232 | 80.4% | 200 | 415 | 299 | 63 | 13 |
| Census Tract 6125 | 1,666 | 2,072 | 80.4% | 343 | 539 | 518 | 201 | 65 |
| Census Tract 6086 | 1,604 | 2,010 | 79.8% | 360 | 555 | 536 | 142 | 11 |
| Census Tract 6062.01 | 951 | 1,196 | 79.5% | 238 | 139 | 156 | 145 | 273 |
| Census Tract 6106.02 | 886 | 1,116 | 79.4% | 61 | 5 | 394 | 160 | 266 |
| Census Tract 6013.01 | 999 | 1,262 | 79.2% | 344 | 128 | 338 | 144 | 45 |
| Census Tract 6110 | 1,822 | 2,303 | 79.1% | 415 | 365 | 678 | 289 | 75 |
| Census Tract 6008 | 2,406 | 3,047 | 79.0% | 636 | 695 | 931 | 67 | 77 |
| Census Tract 6089 | 2,498 | 3,165 | 78.9% | 1,442 | 788 | 196 | 53 | 19 |
| Census Tract 6095 | 1,368 | 1,733 | 78.9% | 168 | 317 | 534 | 194 | 155 |
| Census Tract 6140 | 1,626 | 2,063 | 78.8% | 288 | 983 | 326 | 12 | 17 |
| Census Tract 6022.01 | 1,454 | 1,848 | 78.7% | 150 | 254 | 390 | 325 | 335 |
| Census Tract 6031 | 939 | 1,194 | 78.6% | 163 | 188 | 460 | 86 | 42 |
| Census Tract 6057 | 1,512 | 1,927 | 78.5% | 458 | 282 | 355 | 119 | 298 |
| Census Tract 6068 | 1,050 | 1,339 | 78.4% | 452 | 307 | 291 | 0 | 0 |
| Census Tract 6082 | 1,135 | 1,450 | 78.3% | 496 | 522 | 54 | 18 | 45 |
| Census Tract 6020.01 | 1,299 | 1,669 | 77.8% | 207 | 311 | 406 | 93 | 282 |
| Census Tract 6048 | 1,587 | 2,040 | 77.8% | 365 | 166 | 259 | 417 | 380 |
| Census Tract 6083 | 1,078 | 1,392 | 77.4% | 442 | 577 | 59 | 0 | 0 |
| Census Tract 6025 | 1,189 | 1,548 | 76.8% | 217 | 790 | 130 | 7 | 45 |
| Census Tract 6070 | 1,135 | 1,477 | 76.8% | 508 | 385 | 200 | 0 | 42 |
| Census Tract 6064 | 2,024 | 2,640 | 76.7% | 371 | 391 | 403 | 387 | 472 |
| Census Tract 6128 | 811 | 1,067 | 76.0% | 24 | 57 | 396 | 320 | 14 |
| Census Tract 6029 | 1,263 | 1,671 | 75.6% | 153 | 270 | 500 | 255 | 85 |
| Census Tract 6023 | 1,091 | 1,445 | 75.5% | 75 | 186 | 306 | 376 | 148 |
| Census Tract 6055.01 | 1,339 | 1,779 | 75.3% | 435 | 298 | 332 | 99 | 175 |