Physical & aggregate · 2025
Odor in Contra Costa Water District, CA tap water
Contra Costa Water District, CA's 2025 Consumer Confidence Report shows Odor at or above the federal limit (3 TON MCL). Measured value is 4.5× the threshold.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Entry point | 13.4 TON | 3 TON MCL |
Highest single sample Source water | 20 TON | 3 TON MCL |
Highest single sample Entry point | 40 TON | 3 TON MCL |
Average Source water | 7.4 TON | 3 TON MCL |
Verbatim from Contra Costa Water District, CA's 2025 Consumer Confidence Report — source document ↗
About Odor
A measure of detectable smell in the water.
Regulated only as a secondary (cosmetic) standard.
How Contra Costa Water District, CA compares
5 of the 193 systems measuring Odor on The Water Map have it at or above the federal limit:
Nearby systems also reporting Odor:
People also ask
+Is there Odor in Contra Costa Water District, CA tap water?
Yes — Contra Costa Water District, CA's 2025 Consumer Confidence Report lists Odor at 13.4 TON. Contra Costa Water District, CA's 2025 Consumer Confidence Report shows Odor at or above the federal limit (3 TON MCL). Measured value is 4.5× the threshold.
+What's the federal limit for Odor in drinking water?
The federal MCL for Odor is 3 TON. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Odor?
A measure of detectable smell in the water. Regulated only as a secondary (cosmetic) standard.
+Which other U.S. cities have Odor over the federal limit?
5 of the 193 systems on The Water Map measuring Odor report it at or above the federal limit. Examples include Santa Rosa, CA, Escondido, City of, CA, City of Martinez, CA.
+Where does this Odor measurement come from?
This page reproduces the Odor 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.