Recent water testing in Middleton, Wisconsin has returned PFAS readings above detection thresholds.

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14

PFAS in Middleton Tap Water

PFAS has been detected in Middleton, Wisconsin drinking water at a maximum level of 0.0465 ppt — below the EPA MCL of 4 ppt (PFOA/PFOS individually).

This analysis covers 24,234 residents across 1 ZIP code in Middleton.

Middleton's overall water quality grade is C (63/100).

Is PFAS in Middleton Water Safe?

PFAS was detected in Middleton 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 Middleton: 6 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 Middleton 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 Wisconsin
• Wisconsin Water Quality
• Middleton Water Quality
• Check Your ZIP Code