Physical & aggregate · 2026
Specific Conductance in Contra Costa Water District, CA tap water
Contra Costa Water District, CA's 2026 Specific Conductance measurement is below the federal limit of 1600 UMHO/CM (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Source water | 261 UMHO/CM | 1600 UMHO/CM MCL |
Average Source water | 261 UMHO/CM | 1600 UMHO/CM MCL |
Verbatim from Contra Costa Water District, CA's 2026 Consumer Confidence Report — source document ↗
About Specific Conductance
A measure of how well water conducts electricity, which tracks dissolved mineral content.
Not federally regulated for health; used as a proxy for total dissolved solids.
How Contra Costa Water District, CA compares
5 of the 213 systems measuring Specific Conductance on The Water Map have it at or above the federal limit:
Nearby systems also reporting Specific Conductance:
People also ask
+Is there Specific Conductance in Contra Costa Water District, CA tap water?
Yes — Contra Costa Water District, CA's 2026 Consumer Confidence Report lists Specific Conductance at 261 UMHO/CM. Contra Costa Water District, CA's 2026 Specific Conductance measurement is below the federal limit of 1600 UMHO/CM (MCL).
+What's the federal limit for Specific Conductance in drinking water?
The federal MCL for Specific Conductance is 1600 UMHO/CM. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Specific Conductance?
A measure of how well water conducts electricity, which tracks dissolved mineral content. Not federally regulated for health; used as a proxy for total dissolved solids.
+Which other U.S. cities have Specific Conductance over the federal limit?
5 of the 213 systems on The Water Map measuring Specific Conductance report it at or above the federal limit. Examples include Inglewood, CA, El Cajon, CA, Overland Park, KS.
+Where does this Specific Conductance measurement come from?
This page reproduces the Specific Conductance entry from the 2026 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/2026/source.