Copper in Creston, CA Drinking Water
Copper data for Creston, California · 47,788 residents · 1 ZIP code
Over the past reporting period, water systems in Creston, California have recorded Copper at detectable concentrations in EPA compliance samples.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Copper in Creston Tap Water
Copper has been detected in Creston, California drinking water at a maximum level of 321 ppb — below the EPA action level of 1.3 mg/L (action level).
This analysis covers 47,788 residents across 1 ZIP code in Creston.
Creston's overall water quality grade is D (53/100).
Is Copper in Creston Water Safe?
Copper was detected in Creston 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
| ZIP Code | Copper Level | EPA Limit | Status |
|---|---|---|---|
| 93432 | 321 ppb | 1.3 mg/L (action level) | OK |
Average copper level across Creston: 321 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 Creston Water
- Run water for 30-60 seconds before use (flushes stagnant water)
- Install an NSF 53 or NSF 58 certified filter
- If pH is low, consider a whole-home acid neutralizer
- Test first-draw morning water to check actual copper levels
Look for filters certified under NSF 53 for copper removal.