Data source: EPA SDWIS Last verified: 2026-06-04

Water quality varies significantly across San Antonio, TX. We analyzed 86 ZIP codes to help you compare neighborhoods by water safety, lead risk, and EPA compliance.

City Overview: Grade A (92/100)

Grade	Neighborhoods	%
A	74	86%
B	12	14%
C	0	0%
D	0	0%
F	0	0%

Neighborhood Rankings

Every ZIP code in San Antonio ranked by Home Safety Score:

Rank	ZIP Code	Score	Grade	Violations	Lead Risk
1	78203	98	A	2	0.0016 mg/L
2	78206	98	A	2	0.0016 mg/L
3	78234	98	A	2	0.0016 mg/L
4	78235	98	A	2	0.0016 mg/L
5	78243	98	A	2	0.0016 mg/L
6	78246	98	A	2	0.0016 mg/L
7	78268	98	A	2	0.0016 mg/L
8	78269	98	A	2	0.0016 mg/L
9	78270	98	A	2	0.0016 mg/L
10	78278	98	A	2	0.0016 mg/L
11	78279	98	A	2	0.0016 mg/L
12	78280	98	A	2	0.0016 mg/L
13	78283	98	A	2	0.0016 mg/L
14	78284	98	A	2	0.0016 mg/L
15	78285	98	A	2	0.0016 mg/L
16	78286	98	A	2	0.0016 mg/L
17	78287	98	A	2	0.0016 mg/L
18	78288	98	A	2	0.0016 mg/L
19	78289	98	A	2	0.0016 mg/L
20	78292	98	A	2	0.0016 mg/L
21	78293	98	A	2	0.0016 mg/L
22	78294	98	A	2	0.0016 mg/L
23	78295	98	A	2	0.0016 mg/L
24	78296	98	A	2	0.0016 mg/L
25	78297	98	A	2	0.0016 mg/L
26	78298	98	A	2	0.0016 mg/L
27	78299	98	A	2	0.0016 mg/L
28	78202	94	A	2	0.0016 mg/L
29	78204	94	A	2	0.0016 mg/L
30	78208	94	A	2	0.0016 mg/L
31	78222	94	A	2	0.0016 mg/L
32	78224	94	A	2	0.0016 mg/L
33	78225	94	A	2	0.0016 mg/L
34	78226	94	A	2	0.0016 mg/L
35	78229	94	A	2	0.0016 mg/L
36	78241	94	A	2	0.0016 mg/L
37	78244	94	A	2	0.0016 mg/L
38	78251	94	A	2	0.0016 mg/L
39	78252	94	A	2	0.0016 mg/L
40	78256	94	A	2	0.0016 mg/L
41	78261	94	A	2	0.0016 mg/L
42	78263	94	A	2	0.0016 mg/L
43	78264	94	A	2	0.0016 mg/L
44	78265	94	A	2	0.0016 mg/L
45	78291	94	A	2	0.0016 mg/L
46	78205	89	A	2	0.0016 mg/L
47	78207	89	A	2	0.0016 mg/L
48	78210	89	A	2	0.0016 mg/L
49	78211	89	A	2	0.0016 mg/L
50	78214	89	A	2	0.0016 mg/L
51	78215	89	A	2	0.0016 mg/L
52	78219	89	A	2	0.0016 mg/L
53	78220	89	A	2	0.0016 mg/L
54	78221	89	A	2	0.0016 mg/L
55	78223	89	A	2	0.0016 mg/L
56	78231	89	A	2	0.0016 mg/L
57	78233	89	A	2	0.0016 mg/L
58	78237	89	A	2	0.0016 mg/L
59	78239	89	A	2	0.0016 mg/L
60	78240	89	A	2	0.0016 mg/L
61	78242	89	A	2	0.0016 mg/L
62	78245	89	A	2	0.0016 mg/L
63	78247	89	A	2	0.0016 mg/L
64	78248	89	A	2	0.0016 mg/L
65	78249	89	A	2	0.0016 mg/L
66	78250	89	A	2	0.0016 mg/L
67	78253	89	A	2	0.0016 mg/L
68	78254	89	A	2	0.0016 mg/L
69	78255	89	A	2	0.0016 mg/L
70	78257	89	A	2	0.0016 mg/L
71	78258	89	A	2	0.0016 mg/L
72	78259	89	A	2	0.0016 mg/L
73	78260	89	A	2	0.0016 mg/L
74	78266	89	A	2	0.0016 mg/L
75	78201	84	B	2	0.0016 mg/L
76	78212	84	B	2	0.0016 mg/L
77	78213	84	B	2	0.0016 mg/L
78	78216	84	B	2	0.0016 mg/L
79	78217	84	B	2	0.0016 mg/L
80	78218	84	B	2	0.0016 mg/L
81	78227	84	B	2	0.0016 mg/L
82	78228	84	B	2	0.0016 mg/L
83	78230	84	B	2	0.0016 mg/L
84	78232	84	B	2	0.0016 mg/L
85	78238	84	B	2	0.0016 mg/L
86	78209	79	B	2	0.0016 mg/L

How Neighborhoods Compare

Each ZIP code compared to county and state averages:

• 46 neighborhoods score better than county average
• 40 neighborhoods score worse than county average

EPA Violations

• 172 total violations across San Antonio
• 86 health-based violations
• 86 of 86 ZIP codes have violations
• 0 ZIP codes exceed EPA lead action level

Top Contaminants

Contaminant	Violations	ZIPs
Total Coliform	86	86
Stage 1 DBP Rule	86	86

Frequently Asked Questions

What is the safest neighborhood in San Antonio?

ZIP code 78203 has the highest safety score in San Antonio at 98/100 (grade A). Check the full report for details.

Is San Antonio water safe to drink?

San Antonio has an average water safety score of 92/100 (A). Water quality varies by neighborhood — no ZIP codes currently exceed EPA lead limits. Always check your specific ZIP code.

Related Pages

• San Antonio, TX city page
• Texas state rankings
• All Texas alerts

Data Sources

• EPA SDWIS
• U.S. Census Bureau

Updated daily.