ZipCheckup's reading of PFAS in Louisville, Kentucky: the highest detected level is 0.0107 ppt; the EPA limit is 4 ppt (PFOA/PFOS individually). PFAS carries a high health-risk designation.

Across the water systems that serve Louisville, Kentucky, PFAS has appeared in EPA compliance samples - standard municipal treatment targets this contaminant, though detections in the compliance record indicate it has reached household taps at measurable levels.

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-07-13

PFAS in Louisville Tap Water

PFAS has been detected in Louisville, Kentucky drinking water at a maximum level of 0.0107 detections — relative to the EPA MCL of 4 ppt (PFOA/PFOS individually).

This analysis covers 765,842 residents across 66 ZIP codes in Louisville.

Louisville's overall water quality grade is C (65/100).

Is PFAS in Louisville Water Safe?

PFAS was detected in Louisville water but currently falls within EPA limits. However, some health organizations argue the EPA MCL may not be protective enough.

If you are concerned, a reverse osmosis or granular activated carbon filter can reduce pfas levels further.

PFAS Levels by ZIP Code

Average pfas level across Louisville: 6.56 ppt

Health Effects of PFAS

• Increased risk of kidney and testicular cancer
• Thyroid disease and immune system suppression
• Reproductive problems and reduced fertility
• Elevated cholesterol and liver effects
• Developmental effects in infants and children

Health risk severity: High. Governed by the PFAS National Primary Drinking Water Regulation (2024).

How PFAS Gets Into Drinking Water

• Firefighting foam (AFFF) used at military bases and airports
• Industrial manufacturing (non-stick coatings, stain-resistant fabrics)
• Wastewater treatment plants that receive industrial discharge
• Landfill leachate from PFAS-containing consumer products

What to Do About PFAS in Louisville Water

1. Install a reverse osmosis system (most effective — removes 90%+ of PFAS)
2. Granular activated carbon (GAC) filters remove some PFAS compounds
3. Look for NSF 53 or NSF 58 certification specifically tested for PFAS
4. Pitcher filters with activated carbon provide partial reduction

Look for filters certified under NSF 53 / NSF 58 for pfas removal.

Related

• PFAS — National Overview
• PFAS in Kentucky
• Kentucky Water Quality
• Louisville Water Quality
• Check Your ZIP Code