COUNTY REPORT KY

Jefferson County, Kentucky

72 ZIP codes · Avg score 50/100 · Grade D · Updated

ZipCheckup grade for Jefferson County: D.

Several federal signals point to home-safety risks in this ZIP.

Monitoring across Jefferson County's 72 ZIP codes reveals a persistent pattern of below-average water quality - multiple areas carry documented health violations, and the data has shown little improvement over recent reporting cycles.

How Jefferson County Compares

Jefferson County50/100
Kentucky avg69/100
National avg73/100

How Jefferson County Compares

D
County Grade
50/100
Avg Safety Score
72
ZIP Codes
7
Water Systems

Jefferson County scores 19 points below the Kentucky state average (69/100) and 23 points below the national average (73/100).

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:

D
County Grade
50
Avg Safety Score
72
ZIP Codes
Best ZIP: 40023 (50/100)
Lowest ZIP: 40299 (50/100)
$235K
Median Home Value
$2,253
Avg Remediation (96% of home value)

ZIP Code Risk Map

Water Quality Map: Jefferson County, Kentucky

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Key Risk Factors

Estimated additional annual cost per homeowner: $1,211, driven primarily by flood

Compound Risk Breakdown

Estimated additional annual cost per homeowner: $1,211

Flood $1,467/yr
Energy Code Gap $438/yr
Water Infrastructure $224/yr

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 Jefferson County

$235K
Median Home Value
$2,253
Est. Remediation Cost
1.0%
of Home Value
Remediation as % of home value low burden

Remediation costs are relatively manageable for most homeowners in Jefferson 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 serving Jefferson County

7 community water systems serving Jefferson County.

Show all 7 water systems

All ZIP Codes in Jefferson County

72 ZIP codes tracked in Jefferson County.

# ZIP Code City Safety Score Grade Violations Home Value
1 40023 Fisherville 50 D 0 $430K
2 40025 Glenview 50 D 0 $1202K
3 40041 Masonic Home 50 D 0 $593K
4 40059 Prospect 50 D 0 $534K
5 40118 Fairdale 50 D 0 $141K
6 40202 Louisville 50 D 0 $340K
7 40203 Louisville 50 D 0 $179K
8 40204 Louisville 50 D 0 $315K
9 40205 Louisville 50 D 0 $362K
10 40206 Louisville 50 D 0 $276K
11 40207 Louisville 50 D 0 $402K
12 40208 Louisville 50 D 0 $153K
13 40209 Louisville 50 D 0 $128K
14 40210 Louisville 50 D 0 $93K
15 40211 Louisville 50 D 0 $98K
16 40212 Louisville 50 D 0 $78K
17 40213 Louisville 50 D 0 $169K
18 40214 Louisville 50 D 0 $177K
19 40215 Louisville 50 D 0 $107K
20 40216 Louisville 50 D 0 $155K
21 40217 Louisville 50 D 0 $221K
22 40218 Louisville 50 D 0 $196K
23 40219 Louisville 50 D 0 $186K
24 40220 Louisville 50 D 0 $250K
25 40222 Louisville 50 D 0 $347K
26 40223 Louisville 50 D 0 $344K
27 40228 Louisville 50 D 0 $220K
28 40229 Louisville 50 D 0 $197K
29 40241 Louisville 50 D 0 $349K
30 40242 Louisville 50 D 0 $293K
31 40243 Louisville 50 D 0 $298K
32 40245 Louisville 50 D 0 $433K
33 40258 Louisville 50 D 0 $173K
34 40272 Louisville 50 D 0 $170K
35 40280 Louisville 50 D 0
36 40291 Louisville 50 D 0 $265K
37 40299 Louisville 50 D 0 $275K
38 40018 Eastwood
39 40027 Harrods Creek
40 40221 Louisville
41 40224 Louisville
42 40225 Louisville
43 40231 Louisville 0
44 40232 Louisville
45 40233 Louisville
46 40250 Louisville
47 40251 Louisville
48 40252 Louisville
49 40253 Louisville
50 40255 Louisville
51 40256 Louisville
52 40257 Louisville
53 40259 Louisville
54 40261 Louisville
55 40266 Louisville
56 40268 Louisville
57 40269 Louisville
58 40270 Louisville
59 40281 Louisville
60 40282 Louisville
61 40283 Louisville
62 40285 Louisville
63 40287 Louisville
64 40289 Louisville
65 40290 Louisville
66 40292 Louisville
67 40293 Louisville
68 40294 Louisville
69 40295 Louisville
70 40296 Louisville
71 40297 Louisville
72 40298 Louisville

Recommended Buyer Guides for Jefferson County

Editorial methodology pairs each documented risk in this county with the buyer category that addresses it, drawing on water-quality detections, housing-stock lead exposure, EPA Radon Zone designation, and FEMA flood and wildfire ratings. NSF-certified options surface where applicable, and products that match the specific contaminant take priority.

Overview

Jefferson County in Kentucky covers 72 tracked ZIP records with an average Home Safety Score of D (50/100) across 37 scored records.

The available EPA record reports 0 violations for 38 ZIP codes with a reported violation count.

← Back to Kentucky Home Safety Profile

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

What You Can Do

Jefferson County has a grade of D. Here are steps to protect your household.

1

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.

2

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

3

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.

Frequently Asked Questions

Is water safe in Jefferson County?
Jefferson County receives a grade of D. 0 of 72 ZIP codes have health-based violations. Independent water testing is recommended.
How many water systems serve Jefferson County?
Jefferson County is served by 7 public water systems that supply drinking water to residents across 72 ZIP codes.
What is the biggest environmental risk in Jefferson County?
The primary environmental risk factor in Jefferson County is flood. This contributes to an estimated additional annual cost of $1,211 per homeowner.
How does Jefferson County compare to Kentucky?
Jefferson County has an average Home Safety Score of 50/100 under model 4.0.0, which is below the Kentucky state average of 69/100.

How to cite this page

APA ZipCheckup. (2026). Jefferson County, KY: HSS 50/100; High Radon Risk. https://zipcheckup.com/county/kentucky/jefferson/
BibTeX
@misc{zipcheckup-county-kentucky-jefferson,
  author = {{ZipCheckup}},
  title  = {{Jefferson County, KY: HSS 50/100; High Radon Risk}},
  year   = {2026},
  url    = {https://zipcheckup.com/county/kentucky/jefferson/}
}

Page version: August 2026.

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