What's in Walnut Creek, CA tap water

Every one of the 0 contaminants measured in Walnut Creek, CA's 2023 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.

0 contaminants were measured in Walnut Creek, CA's 2023 Consumer Confidence Report. 0 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.

Every value is transcribed from Walnut Creek, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.

Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2023 report; a new report will replace it once the utility publishes its next annual update.