Contaminant guide

Copper

Copper can leach from household plumbing. Short-term high levels can cause stomach upset; long-term high exposure can affect the liver and kidneys.

Health context

Acute copper exposure may cause nausea and vomiting. People with Wilson’s disease are especially sensitive.

EPA standard notes

EPA Lead and Copper Rule action level for copper is 1.3 mg/L at the 90th percentile of tap samples.

Standards and rules change—confirm on epa.gov/sdwa.

What you can do

Flush cold water after stagnation.
Avoid using hot tap water for drinking or cooking.
If levels are high, a certified filter or plumbing changes may help.

FAQ

Is a filter required?

Not automatically. Many systems meet standards without point-of-use filters. Filters can be useful for taste, specific contaminants, or home plumbing issues—match certifications to the problem.

Where should I verify numbers?

Your utility’s Consumer Confidence Report, public notices, TCEQ resources, and EPA ECHO/SDWIS records.