Data source: EPA SDWIS Last verified: 2026-07-19

ZipCheckup compares 86 ZIP codes across San Antonio, TX. The area averages a grade A (92/100); 86 ZIP codes carry recorded EPA violations.

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.