Within Prescott, Arizona, Chromium-6 has been detected in water samples drawn from the public supply — the results are part of the official EPA compliance record for systems here.

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

Chromium-6 in Prescott Tap Water

Chromium-6 has been detected in Prescott, Arizona drinking water at a maximum level of 0.14 ppb — below the EPA MCL of 100 ppb (total chromium MCL).

This analysis covers 48,456 residents across 6 ZIP codes in Prescott.

Prescott's overall water quality grade is F (32/100).

Is Chromium-6 in Prescott Water Safe?

Chromium-6 was detected in Prescott 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 strong-base anion exchange filter can reduce chromium-6 levels further.

Chromium-6 Levels by ZIP Code

Average chromium-6 level across Prescott: 0.14 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 Prescott 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
• Chromium-6 in Arizona
• Arizona Water Quality
• Prescott Water Quality
• Check Your ZIP Code