Metals · 2026
Iron in Golden State Water Company - Los Osos, CA tap water
Golden State Water Company - Los Osos, CA's 2026 Iron level is between 80% and 100% of the federal limit (300 UG/L MCL) — measured but not in violation.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Entry point | Not detected UG/L | 300 UG/L MCL |
Highest single sample Source water | 1100 UG/L | 300 UG/L MCL |
Average Source water | 256.6666666666667 UG/L | 300 UG/L MCL |
Verbatim from Golden State Water Company - Los Osos, CA's 2026 Consumer Confidence Report — source document ↗
About Iron
A naturally occurring metal common in groundwater.
Regulated only as a secondary (cosmetic) standard; causes rusty color, staining, and metallic taste.
How Golden State Water Company - Los Osos, CA compares
5 of the 236 systems measuring Iron on The Water Map have it at or above the federal limit:
Nearby systems also reporting Iron:
People also ask
+Is there Iron in Golden State Water Company - Los Osos, CA tap water?
Yes — Golden State Water Company - Los Osos, CA's 2026 Consumer Confidence Report lists Iron at 256.6666666666667 UG/L. Golden State Water Company - Los Osos, CA's 2026 Iron level is between 80% and 100% of the federal limit (300 UG/L MCL) — measured but not in violation.
+What's the federal limit for Iron in drinking water?
The federal MCL for Iron is 300 UG/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Iron?
A naturally occurring metal common in groundwater. Regulated only as a secondary (cosmetic) standard; causes rusty color, staining, and metallic taste.
+Which other U.S. cities have Iron over the federal limit?
5 of the 236 systems on The Water Map measuring Iron report it at or above the federal limit. Examples include Bakersfield, City of, CA, City of San Jose - Evg/edv/coy, CA, City of Vallejo, CA.
+Where does this Iron measurement come from?
This page reproduces the Iron entry from the 2026 Consumer Confidence Report published by the Golden State Water Company - Los Osos, 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/golden-state-water-company-los-osos/2026/source.