If you rely on a public water system in Plymouth, Washington, Copper is a contaminant your utility has been required to test for — and EPA records show it has been detected at measurable levels, making it worth understanding as part of your tap water's detection record.

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

Copper in Plymouth Tap Water

Copper has been detected in Plymouth, Washington drinking water at a maximum level of 0.652 ppb — below the EPA action level of 1.3 mg/L (action level).

This analysis covers 114,468 residents across 1 ZIP code in Plymouth.

Plymouth's overall water quality grade is D (53/100).

Is Copper in Plymouth Water Safe?

Copper was detected in Plymouth water but currently falls within EPA limits. However, some health organizations argue the EPA action level may not be protective enough.

If you are concerned, a reverse osmosis or nsf 53 carbon block filter can reduce copper levels further.

Copper Levels by ZIP Code

Average copper level across Plymouth: 0.65 ppb

Health Effects of Copper

• Nausea, vomiting, and diarrhea (short-term, high levels)
• Liver and kidney damage (long-term)
• Particularly dangerous for people with Wilson's disease
• Infants are more sensitive than adults

Health risk severity: Moderate. Governed by the Lead and Copper Rule.

How Copper Gets Into Drinking Water

• Corrosion of copper household plumbing
• Acidic (low pH) water accelerates copper leaching
• New copper pipes leach more than aged ones
• Mining and industrial discharge (rare for tap water)

What to Do About Copper in Plymouth Water

1. Run water for 30-60 seconds before use (flushes stagnant water)
2. Install an NSF 53 or NSF 58 certified filter
3. If pH is low, consider a whole-home acid neutralizer
4. Test first-draw morning water to check actual copper levels

Look for filters certified under NSF 53 for copper removal.

Related

• Copper — National Overview
• Copper in Washington
• Washington Water Quality
• Plymouth Water Quality
• Check Your ZIP Code