Pennsylvania — 4th District
119th Congress · 103 ZIP codes · Avg score 48/100 · Grade D · 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 Pennsylvania's 4th District. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 18041 | East Greenville | 69 | C | 898 (1 health) |
| 2 | 19603 | Reading | 68 | C | 23 (2 health) |
| 3 | 19609 | Reading | 68 | C | 23 (2 health) |
| 4 | 19612 | Reading | 64 | C | 23 (2 health) |
| 5 | 19510 | Blandon | 63 | C | 2 |
| 6 | 19565 | Wernersville | 63 | C | 8 |
| 7 | 19601 | Reading | 63 | C | 23 (2 health) |
| 8 | 19604 | Reading | 63 | C | 23 (2 health) |
| 9 | 19607 | Reading | 63 | C | 23 (2 health) |
| 10 | 19608 | Reading | 63 | C | 23 (2 health) |
| 11 | 19610 | Reading | 63 | C | 23 (2 health) |
| 12 | 19611 | Reading | 63 | C | 23 (2 health) |
| 13 | 19562 | Topton | 61 | C | 26 (1 health) |
| 14 | 17050 | Mechanicsburg | 60 | C | 1 |
| 15 | 18969 | Telford | 59 | C | 13 |
| 16 | 19506 | Bernville | 58 | C | 6 |
| 17 | 19508 | Birdsboro | 58 | C | 29 (2 health) |
| 18 | 19512 | Boyertown | 58 | C | 4 |
| 19 | 19602 | Reading | 58 | C | 23 (2 health) |
| 20 | 19605 | Reading | 58 | C | 23 (2 health) |
| 21 | 19606 | Reading | 58 | C | 23 (2 health) |
| 22 | 19525 | Gilbertsville | 57 | C | 0 |
| 23 | 17073 | Newmanstown | 56 | C | 36 |
| 24 | 18054 | Green Lane | 56 | C | 3 |
| 25 | 17055 | Mechanicsburg | 55 | C | 1 |
| 26 | 19555 | Shoemakersville | 55 | C | 9 (2 health) |
| 27 | 19504 | Barto | 54 | D | 174 (5 health) |
| 28 | 19567 | Womelsdorf | 54 | D | 11 (3 health) |
| 29 | 18070 | Palm | 53 | D | 0 |
| 30 | 18964 | Souderton | 53 | D | 0 |
| 31 | 19437 | Gwynedd Valley | 53 | D | 0 |
| 32 | 19472 | Sassamansville | 53 | D | 0 |
| 33 | 19477 | Spring House | 53 | D | 0 |
| 34 | 19507 | Bethel | 53 | D | 0 |
| 35 | 19519 | Earlville | 53 | D | 0 |
| 36 | 19523 | Geigertown | 53 | D | 0 |
| 37 | 19538 | Maxatawny | 53 | D | 0 |
| 38 | 19539 | Mertztown | 53 | D | 0 |
| 39 | 19541 | Mohrsville | 53 | D | 0 |
| 40 | 19548 | Pine Forge | 53 | D | 0 |
| 41 | 19564 | Virginville | 53 | D | 0 |
| 42 | 19048 | Fort Washington | 51 | D | 24 (8 health) |
| 43 | 19468 | Royersford | 51 | D | 83 (3 health) |
| 44 | 19526 | Hamburg | 51 | D | 23 |
| 45 | 19435 | Frederick | 50 | D | 16 |
| 46 | 19518 | Douglassville | 50 | D | 5 |
| 47 | 18069 | Orefield | 49 | D | 16 |
| 48 | 19046 | Jenkintown | 49 | D | 3 |
| 49 | 19044 | Horsham | 46 | D | 205 |
| 50 | 19473 | Schwenksville | 46 | D | 20 |
Overview
Pennsylvania's 4th District serving an estimated 2,896,168 residents encompasses 103 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is D (48/100).
2547 EPA violations have been recorded across this district's water systems. 75 are health-based violations. About 50% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Contaminant 0700 — 291 violations
- Lead and Copper Rule — 236 violations
- Consumer Confidence Report Rule — 113 violations
- Total Trihalomethanes (TTHM) — 109 violations
- Haloacetic Acids (HAA5) — 106 violations
Housing Context
Homes in this district were built on average around 1966 (~60 years old). Older homes may have lead pipes or solder — consider a water filter if your home predates 1986.
Lead Alert: 6 ZIP codes in this district exceed the EPA action level for lead. Consider using a certified lead-removal filter.
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 103 ZIP codes in Pennsylvania's 4th District.