Metals · 2023
Manganese in Contra Costa Water District, CA tap water
Contra Costa Water District, CA's 2023 Manganese level is between 80% and 100% of the federal limit (50 UG/L MCL) — measured but not in violation.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Source water | 42.6 UG/L | 50 UG/L MCL |
Highest single sample Entry point | 82 UG/L | 50 UG/L MCL |
Average Entry point | 35.4 UG/L | 50 UG/L MCL |
Highest single sample Distribution | Not detected UG/L | 50 UG/L MCL |
Highest single sample Source water | 74 UG/L | 50 UG/L MCL |
Verbatim from Contra Costa Water District, CA's 2023 Consumer Confidence Report — source document ↗
About Manganese
A naturally occurring metal from soil and rock.
No enforceable federal limit; high levels stain fixtures and laundry and can affect taste, with a health advisory for infants.
How Contra Costa Water District, CA compares
5 of the 249 systems measuring Manganese on The Water Map have it at or above the federal limit:
Nearby systems also reporting Manganese:
People also ask
+Is there Manganese in Contra Costa Water District, CA tap water?
Yes — Contra Costa Water District, CA's 2023 Consumer Confidence Report lists Manganese at 42.6 UG/L. Contra Costa Water District, CA's 2023 Manganese level is between 80% and 100% of the federal limit (50 UG/L MCL) — measured but not in violation.
+What's the federal limit for Manganese in drinking water?
The federal MCL for Manganese is 50 UG/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Manganese?
A naturally occurring metal from soil and rock. No enforceable federal limit; high levels stain fixtures and laundry and can affect taste, with a health advisory for infants.
+Which other U.S. cities have Manganese over the federal limit?
5 of the 249 systems on The Water Map measuring Manganese report it at or above the federal limit. Examples include Green Bay, WI, Mesa Del Toro Mwc, CA, Kent, WA.
+Where does this Manganese measurement come from?
This page reproduces the Manganese 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.