Drinking water quality · 2023
What's in Cal/am Water Company - San Marino — Rosemead, Ca, CA tap water
26 contaminants were measured in the Cal/am Water Company - San Marino — Rosemead, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 26
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
state-level CCR
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Monitoring1 violation on recordresolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1.17–1.53 mg/LRangeRange Detected | 4 mg/LMRDLG | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 2.9 mg/LAverageSan Marino Distribution System | 10 mg/LPublic health goal | Within the limit |
+By source (2)— San Marino Distribution System, MWD Weymouth
| |||
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.81 mg/LAverageSan Marino Distribution System | 1 mg/LPublic health goal | Within the limit |
+By source (2)— San Marino Distribution System, MWD Weymouth
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.226 mg/L90th percentileAt the tap | 0.3 mg/LPublic health goal | Within the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 0.61 ug/LAverageSan Marino Distribution System | 0.004 ug/LPublic health goal | Within the limit |
+By source (2)— San Marino Distribution System, MWD Weymouth
| |||
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0.0 mg/L90th percentileAt the tap | 0.015 mg/LAction level | None detected |
| AluminumA common element sometimes used as a treatment coagulant. | 93 ug/LAverageMWD Weymouth | 600 ug/LPublic health goal | Detected — no federal limit |
+By source (2)— MWD Weymouth, San Marino Distribution System
| |||
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 8.2 ug/LAverageSan Marino Distribution System | 0.02 ug/LPublic health goal | Detected — no federal limit |
+By source (2)— San Marino Distribution System, MWD Weymouth
| |||
| LithiumA naturally occurring element found in some groundwater. | 40 ug/LAverageSystem-wide | None set | Detected — no federal limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 13.4 ug/LRunning annual avgSystem-wide | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 2.3 ug/LRunning annual avgSystem-wide | None set | Within the limit |
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | 0.81 ug/LAverageSan Marino Distribution System | 1 ug/LPublic health goal | Detected — no federal limit |
+By source (2)— San Marino Distribution System, MWD Weymouth
| |||
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 0.95 pCi/LAverageSan Marino Distribution System | 0 pCi/LPublic health goal | Within the limit |
+By source (2)— San Marino Distribution System, MWD Weymouth
| |||
| Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances. | Not detected pCi/LAverageSan Marino Distribution System | 0 pCi/LPublic health goal | Detected — no federal limit |
+By source (2)— MWD Weymouth, San Marino Distribution System
| |||
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 2.65 pCi/LAverageSan Marino Distribution System | 0.43 pCi/LPublic health goal | Detected — no federal limit |
+By source (2)— MWD Weymouth, San Marino Distribution System
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.06 NTUReported levelSystem-wide | None set | Within the limit |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 0.2 ng/LAverageSystem-wide | 4 ng/LMCL | Within the limit |
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 0.1 ng/LAverageSystem-wide | 4 ng/LMCL | Within the limit |
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 0.1 ng/LAverageSystem-wide | None set | Detected — no federal limit |
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 0.2 ng/LAverageSystem-wide | None set | Detected — no federal limit |
| Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' | 0.3 ng/LAverageSystem-wide | None set | Detected — no federal limit |
| PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' | 1 ng/LAverageSystem-wide | None set | Detected — no federal limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0Highest single samplePercentage | 0MCLG | None detected |
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 3.09 %Highest single samplePercentage | 0 %MCLG | Detected — no federal limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| 1,2,3-TCP | Not detected %AverageSan Marino Distribution System | 0.005 %Public health goal | None detected |
+By source (2)— San Marino Distribution System, MWD Weymouth
| |||
| TetrachloroethyleneAn industrial solvent (PCE) used in dry cleaning and degreasing. | 0.44 %AverageSan Marino Distribution System | 0.06 %Public health goal | Detected — no federal limit |
+By source (2)— San Marino Distribution System, MWD Weymouth
| |||
Source: Cal/am Water Company - San Marino — Rosemead, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.
People also ask about Cal/am Water Company - San Marino — Rosemead, Ca, CA's water
+Is Cal/am Water Company - San Marino — Rosemead, Ca, CA tap water safe to drink in 2023?
Every one of the 26 contaminants measured in Cal/am Water Company - San Marino — Rosemead, Ca, 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.
+What contaminants are in Cal/am Water Company - San Marino — Rosemead, Ca, CA tap water?
26 contaminants were measured in Cal/am Water Company - San Marino — Rosemead, Ca, CA's 2023 Consumer Confidence Report, spanning metals, pfas ("forever chemicals"), and disinfection byproducts. 18 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from Cal/am Water Company - San Marino — Rosemead, Ca, 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.
+How often is Cal/am Water Company - San Marino — Rosemead, Ca, CA's water quality data updated?
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.
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