Yes — San Mateo, CA's 2024 Consumer Confidence Report lists Specific Conductance at 193. San Mateo, CA's 2024 Specific Conductance measurement is below the federal limit of 1600 (MCL).

+What's the federal limit for Specific Conductance in drinking water?

The federal MCL for Specific Conductance is 1600 . 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 88 systems on The Water Map measuring Specific Conductance report it at or above the federal limit. Examples include Ventura, CA, Torrance, CA, Irvine, CA.

+Where does this Specific Conductance measurement come from?

This page reproduces the Specific Conductance entry from the 2024 Consumer Confidence Report published by the San Mateo, 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/san-mateo/2024/source.

Full report

All San Mateo, CA water-quality data →

Every contaminant measured in the 2024 report.

Contaminant pillar

Specific Conductance across the U.S. →

Every public water system measuring Specific Conductance, ranked.