Metals · 2023
Copper in Contra Costa Water District, CA tap water
Contra Costa Water District, CA's 2023 Copper measurement is below the federal limit of 1000 UG/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Source water | 11 UG/L | 1000 UG/L MCL |
Highest single sample Distribution | Not detected UG/L | 1000 UG/L MCL |
Highest single sample Entry point | 18 UG/L | 1000 UG/L MCL |
Average Entry point | 11.6 UG/L | 1000 UG/L MCL |
Average Source water | 6.2 UG/L | 1000 UG/L MCL |
Verbatim from Contra Costa Water District, CA's 2023 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 Contra Costa Water District, 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 Contra Costa Water District, CA tap water?
Yes — Contra Costa Water District, CA's 2023 Consumer Confidence Report lists Copper at 11.6 UG/L. Contra Costa Water District, CA's 2023 Copper measurement is below the federal limit of 1000 UG/L (MCL).
+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 2023 Consumer Confidence Report published by the Contra Costa Water District, 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/contra-costa-water-district/2023/source.