Missouri — 1st District
119th Congress · 108 ZIP codes · Avg score 56/100 · Grade C · Updated 2026-06-03
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-06-03
Top Contaminants
ZIP Codes in This District
100 ZIP codes tracked in Missouri's 1st District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 63099 | Fenton | 81 | B | 3 (2 health) |
| 2 | 63348 | Foristell | 79 | B | 3 |
| 3 | 63385 | Wentzville | 77 | B | 2 |
| 4 | 63070 | Pevely | 76 | B | 4 |
| 5 | 63012 | Barnhart | 73 | B | 0 |
| 6 | 63028 | Festus | 73 | B | 1 |
| 7 | 63048 | Herculaneum | 73 | B | 0 |
| 8 | 63049 | High Ridge | 73 | B | 0 |
| 9 | 63020 | De Soto | 72 | B | 3 |
| 10 | 63368 | O Fallon | 71 | B | 6 |
| 11 | 63052 | Imperial | 70 | B | 3 |
| 12 | 63023 | Dittmer | 65 | C | 3 |
| 13 | 63030 | Fletcher | 63 | C | 0 |
| 14 | 63032 | Florissant | 63 | C | 0 |
| 15 | 63040 | Grover | 63 | C | 0 |
| 16 | 63053 | Kimmswick | 63 | C | 0 |
| 17 | 63103 | Saint Louis | 63 | C | 0 |
| 18 | 63104 | Saint Louis | 63 | C | 0 |
| 19 | 63106 | Saint Louis | 63 | C | 0 |
| 20 | 63110 | Saint Louis | 63 | C | 0 |
| 21 | 63113 | Saint Louis | 63 | C | 0 |
| 22 | 63115 | Saint Louis | 63 | C | 0 |
| 23 | 63140 | Saint Louis | 63 | C | 0 |
| 24 | 63145 | Saint Louis | 63 | C | 0 |
| 25 | 63157 | Saint Louis | 63 | C | 0 |
| 26 | 63166 | Saint Louis | 63 | C | 0 |
| 27 | 63177 | Saint Louis | 63 | C | 0 |
| 28 | 63373 | Portage Des Sioux | 63 | C | 0 |
| 29 | 63626 | Blackwell | 63 | C | 0 |
| 30 | 63016 | Cedar Hill | 61 | C | 35 (4 health) |
| 31 | 63026 | Fenton | 61 | C | 3 (2 health) |
| 32 | 63366 | O Fallon | 61 | C | 6 |
| 33 | 63019 | Crystal City | 58 | C | 10 (10 health) |
| 34 | 63034 | Florissant | 55 | C | 0 |
| 35 | 63066 | Morse Mill | 55 | C | 0 |
| 36 | 63101 | Saint Louis | 55 | C | 0 |
| 37 | 63102 | Saint Louis | 55 | C | 0 |
| 38 | 63105 | Saint Louis | 55 | C | 0 |
| 39 | 63107 | Saint Louis | 55 | C | 0 |
| 40 | 63108 | Saint Louis | 55 | C | 0 |
| 41 | 63109 | Saint Louis | 55 | C | 0 |
| 42 | 63112 | Saint Louis | 55 | C | 0 |
| 43 | 63117 | Saint Louis | 55 | C | 0 |
| 44 | 63118 | Saint Louis | 55 | C | 0 |
| 45 | 63120 | Saint Louis | 55 | C | 0 |
| 46 | 63134 | Saint Louis | 55 | C | 0 |
| 47 | 63139 | Saint Louis | 55 | C | 0 |
| 48 | 63147 | Saint Louis | 55 | C | 0 |
| 49 | 63367 | Lake Saint Louis | 55 | C | 0 |
| 50 | 63025 | Eureka | 53 | D | 9 |
Overview
Missouri's 1st District serving an estimated 781,912 residents encompasses 108 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (56/100).
95 EPA violations have been recorded across this district's water systems. 18 are health-based violations. About 14% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Consumer Confidence Report Rule — 26 violations
- Haloacetic Acids (HAA5) — 12 violations
- Contaminant 0700 — 12 violations
- Surface Water Treatment Rule — 8 violations
- Stage 1 DBP Rule — 7 violations
Housing Context
Homes in this district were built on average around 1960 (~66 years old). Older homes may have lead pipes or solder — consider a water filter if your home predates 1986.
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 108 ZIP codes in Missouri's 1st District.