Chester County, Pennsylvania
90 ZIP codes · Avg score 47/100 · Grade D · Updated 2026-06-04
Across Chester County, EPA compliance records for 90 ZIP codes fall well below average — documented health-based violations affect multiple areas, and the county's sustained low grade points to structural rather than temporary shortfalls in the underlying water systems.
How Chester County Compares
How Chester County Compares
Chester County scores 8 points below the Pennsylvania state average (55/100) and 21 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Chester County, Pennsylvania
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Estimated additional annual cost per homeowner: $4,115, driven primarily by sea_level
Infrastructure: 0.412% avg pipe failure probability, 54% of ZIPs at high risk
Violation History (2021–2026)
→ Stable trendEPA violation counts by year across Chester County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 49 violations. Past 5 years: 126 total (126 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $4,115
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Chester County
Remediation costs are relatively manageable for most homeowners in Chester County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Water Systems with Most Violations
Top 5 systems in Chester County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Chester Water Authority | 140,437 | 132 |
| 2 | Aqua Pa West Chester | 48,600 | 109 |
| 3 | Aqua Pa Main System | 822,600 | 90 |
| 4 | Devereux Foundation Brandywine | 300 | 66 |
| 5 | Westtown School | 900 | 60 |
74 total water systems serve Chester County.
All ZIP Codes in Chester County
90 ZIP codes tracked in Chester County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 19475 | Spring City | 65 | C | 0 | $363K |
| 2 | 19310 | Atglen | 62 | C | 1 | $289K |
| 3 | 19360 | New London | 62 | C | 1 | — |
| 4 | 19344 | Honey Brook | 61 | C | 12 (1 health) | $304K |
| 5 | 19381 | West Chester | 61 | C | 12 (1 health) | — |
| 6 | 19390 | West Grove | 60 | C | 17 (2 health) | $378K |
| 7 | 19330 | Cochranville | 59 | C | 7 | $390K |
| 8 | 19374 | Toughkenamon | 58 | C | 5 | $289K |
| 9 | 19355 | Malvern | 57 | C | 1 | $662K |
| 10 | 19312 | Berwyn | 56 | C | 17 (1 health) | $805K |
| 11 | 19520 | Elverson | 56 | C | 7 | $404K |
| 12 | 19363 | Oxford | 55 | C | 14 | $342K |
| 13 | 19343 | Glenmoore | 54 | D | 6 | $544K |
| 14 | 19383 | West Chester | 54 | D | 12 (1 health) | — |
| 15 | 19388 | West Chester | 54 | D | 12 (1 health) | — |
| 16 | 19442 | Kimberton | 54 | D | 5 (1 health) | — |
| 17 | 17505 | Bird In Hand | 53 | D | 0 | $374K |
| 18 | 17576 | Smoketown | 53 | D | 0 | — |
| 19 | 17978 | Spring Glen | 53 | D | 0 | $233K |
| 20 | 19320 | Coatesville | 53 | D | 11 | $303K |
| 21 | 19345 | Immaculata | 53 | D | 0 | — |
| 22 | 19352 | Lincoln University | 53 | D | 0 | $459K |
| 23 | 19354 | Lyndell | 53 | D | 0 | — |
| 24 | 19358 | Modena | 53 | D | 0 | $161K |
| 25 | 19367 | Pomeroy | 53 | D | 0 | — |
| 26 | 19372 | Thorndale | 53 | D | 0 | $293K |
| 27 | 19395 | Westtown | 53 | D | 0 | — |
| 28 | 19409 | Fairview Village | 53 | D | 0 | — |
| 29 | 19421 | Birchrunville | 53 | D | 0 | — |
| 30 | 19423 | Cedars | 53 | D | 0 | — |
| 31 | 19425 | Chester Springs | 53 | D | 0 | $622K |
| 32 | 19451 | Mainland | 53 | D | 0 | — |
| 33 | 19490 | Worcester | 53 | D | 0 | $1214K |
| 34 | 19465 | Pottstown | 52 | D | 21 (3 health) | $383K |
| 35 | 19348 | Kennett Square | 50 | D | 49 (2 health) | $518K |
| 36 | 19375 | Unionville | 50 | D | 15 (4 health) | $614K |
| 37 | 19335 | Downingtown | 49 | D | 7 | $464K |
| 38 | 19341 | Exton | 48 | D | 27 (4 health) | $487K |
| 39 | 19380 | West Chester | 46 | D | 12 (1 health) | $530K |
| 40 | 19382 | West Chester | 46 | D | 12 (1 health) | $542K |
| 41 | 17582 | Washington Boro | 45 | D | 0 | $289K |
| 42 | 19003 | Ardmore | 45 | D | 0 | $441K |
| 43 | 19350 | Landenberg | 45 | D | 0 | $494K |
| 44 | 19422 | Blue Bell | 45 | D | 0 | $573K |
| 45 | 19456 | Oaks | 45 | D | 0 | $588K |
| 46 | 19457 | Parker Ford | 45 | D | 0 | — |
| 47 | 19462 | Plymouth Meeting | 45 | D | 0 | $452K |
| 48 | 19474 | Skippack | 45 | D | 0 | $327K |
| 49 | 19365 | Parkesburg | 42 | D | 20 (3 health) | $300K |
| 50 | 17503 | Bart | 40 | D | 0 | — |
| 51 | 17504 | Bausman | 40 | D | 0 | $205K |
| 52 | 17528 | Goodville | 40 | D | 0 | — |
| 53 | 17535 | Kinzers | 40 | D | 0 | $347K |
| 54 | 17564 | Penryn | 40 | D | 0 | — |
| 55 | 17585 | Witmer | 40 | D | 0 | — |
| 56 | 17836 | Leck Kill | 40 | D | 0 | $175K |
| 57 | 17941 | Klingerstown | 40 | D | 0 | $210K |
| 58 | 19008 | Broomall | 40 | D | 0 | $470K |
| 59 | 19026 | Drexel Hill | 40 | D | 0 | $243K |
| 60 | 19064 | Springfield | 40 | D | 0 | $390K |
| 61 | 19316 | Brandamore | 40 | D | 0 | — |
| 62 | 19318 | Chatham | 40 | D | 0 | — |
| 63 | 19346 | Kelton | 40 | D | 0 | — |
| 64 | 19347 | Kemblesville | 40 | D | 0 | — |
| 65 | 19351 | Lewisville | 40 | D | 0 | — |
| 66 | 19369 | Sadsburyville | 40 | D | 0 | — |
| 67 | 19371 | Suplee | 40 | D | 0 | — |
| 68 | 19376 | Wagontown | 40 | D | 0 | — |
| 69 | 19397 | Southeastern | 40 | D | 0 | — |
| 70 | 19398 | Southeastern | 40 | D | 0 | — |
| 71 | 19399 | Southeastern | 40 | D | 0 | — |
| 72 | 19405 | Bridgeport | 40 | D | 0 | $315K |
| 73 | 19407 | Audubon | 40 | D | 0 | — |
| 74 | 19408 | Eagleville | 40 | D | 0 | — |
| 75 | 19415 | Eagleville | 40 | D | 0 | — |
| 76 | 19429 | Conshohocken | 40 | D | 0 | — |
| 77 | 19443 | Kulpsville | 40 | D | 0 | — |
| 78 | 19450 | Lederach | 40 | D | 0 | — |
| 79 | 19453 | Mont Clare | 40 | D | 0 | $256K |
| 80 | 19470 | Saint Peters | 40 | D | 0 | — |
| 81 | 19480 | Uwchland | 40 | D | 0 | — |
| 82 | 19484 | Valley Forge | 40 | D | 0 | — |
| 83 | 19493 | Valley Forge | 40 | D | 0 | — |
| 84 | 19494 | Valley Forge | 40 | D | 0 | — |
| 85 | 19495 | Valley Forge | 40 | D | 0 | — |
| 86 | 19496 | Valley Forge | 40 | D | 0 | — |
| 87 | 19311 | Avondale | 38 | F | 15 | $525K |
| 88 | 19087 | Wayne | 35 | F | 0 | $693K |
| 89 | 19428 | Conshohocken | 35 | F | 0 | $446K |
| 90 | 19317 | Chadds Ford | 34 | F | 2 (1 health) | $589K |
Recommended Buyer Guides for Chester County
Below: editorial picks, no sponsored placements.
- Best Water Filters for Lead — Lead above EPA action level in 2 ZIP codes
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Chester County, Pennsylvania
Overview
Chester County in Pennsylvania covers 90 ZIP codes with an average Home Safety Score of D (47/100).
26 of 90 ZIP codes have recorded EPA violations. 27 health-based violations have been documented.
← Back to Pennsylvania water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.
What You Can Do
Chester County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.