In Lincoln, Delaware, Fluoride has been detected in the public water supply — a contaminant that health agencies track because of documented effects associated with prolonged exposure at elevated concentrations.

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-06-04

Fluoride in Lincoln Tap Water

Fluoride has been detected in Lincoln, Delaware drinking water at a maximum level of 1.4 ppb — below the EPA MCL of 4.0 mg/L (MCL) / 2.0 mg/L (SMCL).

This analysis covers 7,083 residents across 1 ZIP code in Lincoln.

Lincoln's overall water quality grade is A (91/100).

Is Fluoride in Lincoln Water Safe?

Fluoride was detected in Lincoln 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 Lincoln: 1.4 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 Lincoln 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
• Delaware Water Quality
• Lincoln Water Quality
• Check Your ZIP Code