Across Largo, Florida, federal monitoring data has captured Chromium-6 in water samples at detectable concentrations in the most recent available reporting cycle.

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-04-05

Chromium-6 in Largo Tap Water

Chromium-6 has been detected in Largo, Florida drinking water at a maximum level of 3.8 ppb — below the EPA MCL of 100 ppb (total chromium MCL).

This analysis covers 105,903 residents across 6 ZIP codes in Largo.

Largo's overall water quality grade is B (72/100).

Is Chromium-6 in Largo Water Safe?

If you live in an affected ZIP code, consider installing a reverse osmosis or strong-base anion exchange filter certified under NSF 58 and testing your water independently.

Chromium-6 Levels by ZIP Code

Average chromium-6 level across Largo: 3.8 ppb

Health Effects of Chromium-6

• Stomach and intestinal cancer (likely carcinogen via ingestion)
• Known carcinogen when inhaled
• Liver and kidney damage
• Reproductive and developmental harm

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

How Chromium-6 Gets Into Drinking Water

• Industrial discharge from steel and pulp mills
• Natural erosion of chromium deposits
• Coal ash disposal sites
• Cooling tower discharge

What to Do About Chromium-6 in Largo Water

1. Reverse osmosis systems are most effective
2. Strong-base anion exchange can reduce chromium-6
3. Standard carbon filters are NOT effective for chromium-6
4. Look for NSF 58 certification

Look for filters certified under NSF 58 for chromium-6 removal.

Related

• Chromium-6 — National Overview
• Florida Water Quality
• Largo Water Quality
• Check Your ZIP Code