Metals · 2026
Copper in Rialto, City of, CA tap water
Rialto, City of, CA's 2026 Consumer Confidence Report tested for Copper and reported no detectable amount.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Source water | Not detected UG/L | 1000 UG/L MCL |
Verbatim from Rialto, City of, CA's 2026 Consumer Confidence Report — source document ↗
About Copper
A metal that enters water from corroding household plumbing.
Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.
How Rialto, City of, CA compares
5 of the 442 systems measuring Copper on The Water Map have it at or above the federal limit:
Nearby systems also reporting Copper:
People also ask
+Is there Copper in Rialto, City of, CA tap water?
Rialto, City of, CA's 2026 Consumer Confidence Report tested for Copper and found no detectable amount.
+What's the federal limit for Copper in drinking water?
The federal MCL for Copper is 1000 UG/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Copper?
A metal that enters water from corroding household plumbing. Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.
+Which other U.S. cities have Copper over the federal limit?
5 of the 442 systems on The Water Map measuring Copper report it at or above the federal limit. Examples include Town of Denton, MD, High Point, NC, Anchorage, AK.
+Where does this Copper measurement come from?
This page reproduces the Copper entry from the 2026 Consumer Confidence Report published by the Rialto, City of, CA water utility — the annual drinking-water report every U.S. utility is required by federal law to publish. The original source document is archived at /water/ca/rialto/2026/source.