Yes — San Mateo, CA's 2024 Consumer Confidence Report lists Giardia lamblia at 0.02. San Mateo, CA's 2024 report shows Giardia lamblia detected, but the EPA has not set an enforceable federal limit for it.

+What's the federal limit for Giardia lamblia in drinking water?

The federal Public health goal for Giardia lamblia is 0 . The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.

+Where does this Giardia lamblia measurement come from?

This page reproduces the Giardia lamblia 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

Giardia lamblia across the U.S. →

Every public water system measuring Giardia lamblia, ranked.