Over the past reporting period, water systems in Lewistown, Pennsylvania have recorded Fluoride at detectable concentrations in EPA compliance samples.

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

Fluoride in Lewistown Tap Water

Fluoride has been detected in Lewistown, Pennsylvania drinking water at a maximum level of 1.43 ppb — below the EPA MCL of 4.0 mg/L (MCL) / 2.0 mg/L (SMCL).

This analysis covers 26,765 residents across 1 ZIP code in Lewistown.

Lewistown's overall water quality grade is D (40/100).

Is Fluoride in Lewistown Water Safe?

Fluoride was detected in Lewistown 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 activated alumina filter can reduce fluoride levels further.

Fluoride Levels by ZIP Code

Average fluoride level across Lewistown: 1.43 ppb

Health Effects of Fluoride

• Skeletal fluorosis at levels above 4 mg/L (bone pain, joint stiffness)
• Dental fluorosis in children at levels above 2 mg/L
• At 0.7 mg/L (water fluoridation level), helps prevent tooth decay
• Possible thyroid effects at high chronic exposure

Health risk severity: Moderate. Governed by the National Primary Drinking Water Regulations.

How Fluoride Gets Into Drinking Water

• Intentional water fluoridation (0.7 mg/L target, beneficial)
• Natural deposits in certain rock formations
• Industrial discharge (aluminum, fertilizer production)
• Naturally elevated in some groundwater (especially arid regions)

What to Do About Fluoride in Lewistown Water

1. Reverse osmosis removes 90%+ of fluoride
2. Activated alumina filters are effective for fluoride
3. Bone char carbon can reduce fluoride
4. Standard activated carbon filters do NOT remove fluoride

Look for filters certified under NSF 58 for fluoride removal.

Related

• Fluoride — National Overview
• Fluoride in Pennsylvania
• Pennsylvania Water Quality
• Lewistown Water Quality
• Check Your ZIP Code