States › Kentucky › Jefferson County

Jefferson County, KY Water Quality

Water quality data for 1 public water systems serving Jefferson County, Kentucky — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 1 water systems · 84 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Jefferson County Earns a A

Jefferson County: 84 communities across 1 water system. 100.0% have no open violations.

  • Median lead where detected: 1.10 ppb
  • 84 communities with a lead detection, 0 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
1.1 ppb
Median Lead Level
County-wide, 90th percentile
1
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
⚠ Needs Attention
County Lead Level — Median 1.1 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.1 ppb — 7.3% of the federal action level
Systems by Lead Level
Under 5 ppb
84

All Cities in Jefferson County

Louisville/Jefferson County metro government (balance) 1.10 ppb A
Louisville 1.10 ppb A
Jeffersontown 1.10 ppb A
St. Matthews 1.10 ppb A
Shively 1.10 ppb A
Lyndon 1.10 ppb A
Middletown 1.10 ppb A
Douglass Hills 1.10 ppb A
Hurstbourne 1.10 ppb A
Prospect 1.10 ppb A
Indian Hills 1.10 ppb A
Graymoor-Devondale 1.10 ppb A
Anchorage 1.10 ppb A
Windy Hills 1.10 ppb A
Hurstbourne Acres 1.10 ppb A
Worthington Hills 1.10 ppb A
Audubon Park 1.10 ppb A
St. Regis Park 1.10 ppb A
West Buechel 1.10 ppb A
Coldstream 1.10 ppb A
Beechwood Village 1.10 ppb A
Barbourmeade 1.10 ppb A
Heritage Creek 1.10 ppb A
Watterson Park 1.10 ppb A
Northfield 1.10 ppb A
Woodlawn Park 1.10 ppb A
Lynnview 1.10 ppb A
Rolling Hills 1.10 ppb A
Bellemeade 1.10 ppb A
Langdon Place 1.10 ppb A
Fincastle 1.10 ppb A
Plantation 1.10 ppb A
Hollow Creek 1.10 ppb A
Blue Ridge Manor 1.10 ppb A
Woodland Hills 1.10 ppb A
Meadow Vale 1.10 ppb A
Rolling Fields 1.10 ppb A
Green Spring 1.10 ppb A
Strathmoor Village 1.10 ppb A
Spring Valley 1.10 ppb A
Seneca Gardens 1.10 ppb A
Brownsboro Farm 1.10 ppb A
Parkway Village 1.10 ppb A
Glenview 1.10 ppb A
Westwood 1.10 ppb A
Murray Hill 1.10 ppb A
Wellington 1.10 ppb A
Hollyvilla 1.10 ppb A
Bancroft 1.10 ppb A
Riverwood 1.10 ppb A
Houston Acres 1.10 ppb A
Briarwood 1.10 ppb A
Forest Hills 1.10 ppb A
Norbourne Estates 1.10 ppb A
Moorland 1.10 ppb A
Richlawn 1.10 ppb A
Kingsley 1.10 ppb A
Poplar Hills 1.10 ppb A
Norwood 1.10 ppb A
Glenview Hills 1.10 ppb A
Old Brownsboro Place 1.10 ppb A
Strathmoor Manor 1.10 ppb A
Bellewood 1.10 ppb A
Brownsboro Village 1.10 ppb A
Creekside 1.10 ppb A
Goose Creek 1.10 ppb A
Druid Hills 1.10 ppb A
Spring Mill 1.10 ppb A
Wildwood 1.10 ppb A
Broeck Pointe 1.10 ppb A
Manor Creek 1.10 ppb A
Crossgate 1.10 ppb A
Glenview Manor 1.10 ppb A
Thornhill 1.10 ppb A
Maryhill Estates 1.10 ppb A
Meadowview Estates 1.10 ppb A
Mockingbird Valley 1.10 ppb A
Sycamore 1.10 ppb A
Cambridge 1.10 ppb A
Hills and Dales 1.10 ppb A
Lincolnshire 1.10 ppb A
Hickory Hill 1.10 ppb A
Meadowbrook Farm 1.10 ppb A
Ten Broeck 1.10 ppb A
Showing 84 cities
No active violations Active violations

About Jefferson County Drinking Water

Jefferson County is served by 1 water system covering 84 communities. No community here has an open violation on record.

Of the communities reporting lead results, 84 recorded a detection, with a median of 1.10 ppb — 7% of the federal action level. 0 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Jefferson County tap water safe to drink?▼
No community in Jefferson County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Jefferson County?▼
Among communities with a detection the median is 1.10 ppb, 7% of the 15 ppb action level. 0 reported none detected and 0 reported no result.
How many water systems serve Jefferson County?▼
1 community water system serves 84 communities here.
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