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