Texas — 21st District
119th Congress · 53 ZIP codes · Avg score 80/100 · Grade B · Updated 2026-07-19
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-19
ZipCheckup tracks water safety for 53 ZIP codes in Texas's 21st District: the district earns a grade B (80/100). 377 EPA violations on record, 93 health-based.
Top Contaminants
ZIP Codes in This District
53 ZIP codes tracked in Texas's 21st District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 78135 | New Braunfels | 98 | A | 4 (1 health) |
| 2 | 78671 | Stonewall | 98 | A | 2 (1 health) |
| 3 | 78131 | New Braunfels | 94 | A | 4 (1 health) |
| 4 | 78261 | San Antonio | 94 | A | 2 (1 health) |
| 5 | 78029 | Kerrville | 91 | A | 7 (4 health) |
| 6 | 78833 | Camp Wood | 91 | A | 14 (4 health) |
| 7 | 78055 | Medina | 90 | A | 1 |
| 8 | 78231 | San Antonio | 89 | A | 2 (1 health) |
| 9 | 78247 | San Antonio | 89 | A | 2 (1 health) |
| 10 | 78259 | San Antonio | 89 | A | 2 (1 health) |
| 11 | 78266 | San Antonio | 89 | A | 2 (1 health) |
| 12 | 78620 | Dripping Springs | 89 | A | 6 (1 health) |
| 13 | 78735 | Austin | 89 | A | 3 (1 health) |
| 14 | 78736 | Austin | 89 | A | 3 (1 health) |
| 15 | 78737 | Austin | 89 | A | 3 (1 health) |
| 16 | 78873 | Leakey | 87 | A | 3 |
| 17 | 78025 | Ingram | 86 | A | 4 (1 health) |
| 18 | 78667 | San Marcos | 85 | A | 1 |
| 19 | 78003 | Bandera | 84 | B | 12 (1 health) |
| 20 | 78024 | Hunt | 84 | B | 9 (1 health) |
| 21 | 78163 | Bulverde | 84 | B | 12 (1 health) |
| 22 | 78213 | San Antonio | 84 | B | 2 (1 health) |
| 23 | 78216 | San Antonio | 84 | B | 2 (1 health) |
| 24 | 78230 | San Antonio | 84 | B | 2 (1 health) |
| 25 | 78232 | San Antonio | 84 | B | 2 (1 health) |
| 26 | 78610 | Buda | 84 | B | 3 |
| 27 | 78636 | Johnson City | 83 | B | 22 |
| 28 | 78010 | Center Point | 81 | B | 21 (3 health) |
| 29 | 78028 | Kerrville | 81 | B | 7 (4 health) |
| 30 | 78063 | Pipe Creek | 81 | B | 5 |
| 31 | 78070 | Spring Branch | 79 | B | 4 |
| 32 | 78132 | New Braunfels | 79 | B | 4 (1 health) |
| 33 | 78133 | Canyon Lake | 79 | B | 17 (3 health) |
| 34 | 78209 | San Antonio | 79 | B | 2 (1 health) |
| 35 | 78623 | Fischer | 74 | B | 14 (5 health) |
| 36 | 78004 | Bergheim | 73 | B | 0 |
| 37 | 78027 | Kendalia | 73 | B | 0 |
| 38 | 78058 | Mountain Home | 73 | B | 0 |
| 39 | 78074 | Waring | 73 | B | 0 |
| 40 | 78675 | Willow City | 73 | B | 0 |
| 41 | 78885 | Vanderpool | 73 | B | 0 |
| 42 | 78013 | Comfort | 71 | B | 60 (11 health) |
| 43 | 78676 | Wimberley | 69 | C | 11 (1 health) |
| 44 | 78006 | Boerne | 68 | C | 55 (11 health) |
| 45 | 78606 | Blanco | 67 | C | 18 (8 health) |
| 46 | 78631 | Harper | 66 | C | 0 |
| 47 | 78635 | Hye | 66 | C | 0 |
| 48 | 78883 | Tarpley | 66 | C | 0 |
| 49 | 78619 | Driftwood | 65 | C | 0 |
| 50 | 78624 | Fredericksburg | 65 | C | 28 (17 health) |
Overview
Texas's 21st District encompasses 53 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is B (80/100).
377 EPA violations have been recorded across this district's water systems. 93 are health-based violations. About 75% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Lead and Copper Rule - 78 violations
- Consumer Confidence Report Rule - 49 violations
- Stage 1 DBP Rule - 41 violations
- Revised Total Coliform Rule - 39 violations
- Stage 2 DBP Rule - 32 violations
Housing Context
Homes in this district were built on average around 1991 (~35 years old). Most homes were built after lead pipe regulations were tightened.
Data Sources
- Water quality violations: EPA Safe Drinking Water Information System (SDWIS)
- Congressional district boundaries: U.S. Census Bureau, 119th Congress
- Housing age: U.S. Census Bureau American Community Survey
Updated daily. Data covers 53 ZIP codes in Texas's 21st District.