Inorganic chemicals · 2025
Chloride in Contra Costa Water District, CA tap water
Contra Costa Water District, CA's 2025 Chloride measurement is below the federal limit of 500 MG/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Source water | 53 MG/L | 500 MG/L MCL |
Highest single sample Entry point | 38 MG/L | 500 MG/L MCL |
Average Source water | 34.166666666666664 MG/L | 500 MG/L MCL |
Average Entry point | 28.2 MG/L | 500 MG/L MCL |
Verbatim from Contra Costa Water District, CA's 2025 Consumer Confidence Report — source document ↗
About Chloride
A naturally occurring salt compound.
Regulated only as a secondary (cosmetic) standard; high levels cause a salty taste and can corrode pipes.
How Contra Costa Water District, CA compares
5 of the 238 systems measuring Chloride on The Water Map have it at or above the federal limit:
Nearby systems also reporting Chloride:
People also ask
+Is there Chloride in Contra Costa Water District, CA tap water?
Yes — Contra Costa Water District, CA's 2025 Consumer Confidence Report lists Chloride at 34.166666666666664 MG/L. Contra Costa Water District, CA's 2025 Chloride measurement is below the federal limit of 500 MG/L (MCL).
+What's the federal limit for Chloride in drinking water?
The federal MCL for Chloride is 500 MG/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Chloride?
A naturally occurring salt compound. Regulated only as a secondary (cosmetic) standard; high levels cause a salty taste and can corrode pipes.
+Which other U.S. cities have Chloride over the federal limit?
5 of the 238 systems on The Water Map measuring Chloride report it at or above the federal limit. Examples include Lakewood, CO, Torrance-city, Water Dept., CA, Torrance, CA.
+Where does this Chloride measurement come from?
This page reproduces the Chloride entry from the 2025 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/2025/source.