Metals · 2025
Copper in City of Thousand Oaks Water Department, CA tap water
City of Thousand Oaks Water Department, CA's 2025 Copper measurement is below the federal limit of 1300 UG/L (Al).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
90th percentile Distribution | 141 UG/L | 1300 UG/L Al |
Highest single sample Distribution | 350 UG/L | None set |
Average Distribution | 57.5 UG/L | None set |
Verbatim from City of Thousand Oaks Water Department, CA's 2025 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 City of Thousand Oaks Water Department, 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 City of Thousand Oaks Water Department, CA tap water?
Yes — City of Thousand Oaks Water Department, CA's 2025 Consumer Confidence Report lists Copper at 141 UG/L. City of Thousand Oaks Water Department, CA's 2025 Copper measurement is below the federal limit of 1300 UG/L (Al).
+What's the federal limit for Copper in drinking water?
The federal Al for Copper is 1300 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 2025 Consumer Confidence Report published by the City of Thousand Oaks Water Department, 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/thousand-oaks-water-department/2025/source.