Drinking water quality · 2023
· Verified
What's in Tesoro Viejo Master Mwc, Inc. — San Jose, Ca, CA tap water
15 contaminants were measured in the Tesoro Viejo Master Mwc, Inc. — San Jose, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 15
- Over federal limit
- 0
- Approaching the limit
- 1
- Service area
- CA
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 66 ug/LAverageAnnual Average | None set | Approaching the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 46 ug/LAverageAnnual Average | None set | Within the limit |
| NDMA | 3.1 ng/LAverageSystem-wide | 10 ng/LNL | Detected — no federal limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Free | 1.6 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.19 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | Not detected ug/L90th percentileAt the tap | None set | None detected |
| AluminumA common element sometimes used as a treatment coagulant. | 24 ug/LAverageSystem-wide | None set | Detected — no federal limit |
| CalciumA naturally occurring mineral that contributes to water hardness. | 3.3–22 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 0.67–1.2 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 3.6–5.6 mg/LRangeSystem-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. | 0MaximumMonthly | None set | None detected |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Toluene | Not detected ug/LAverageSystem-wide | None set | Within the limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AlkalinityA measure of the water's capacity to neutralize acids. | 14–60 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 11–58 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 6.7–8.5RangeSystem-wide | None set | Detected — no federal limit |
People also ask about Tesoro Viejo Master Mwc, Inc. — San Jose, Ca, CA's water
+Is Tesoro Viejo Master Mwc, Inc. — San Jose, Ca, CA tap water safe to drink in 2023?
Every one of the 15 contaminants measured in Tesoro Viejo Master Mwc, Inc. — San Jose, 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 Tesoro Viejo Master Mwc, Inc. — San Jose, Ca, CA tap water?
15 contaminants were measured in Tesoro Viejo Master Mwc, Inc. — San Jose, Ca, CA's 2023 Consumer Confidence Report, spanning metals, disinfection byproducts, and physical & aggregate. 3 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Are any contaminants in Tesoro Viejo Master Mwc, Inc. — San Jose, Ca, CA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: TTHM. Approaching means measured but not in violation — a margin that can close quickly if conditions change.
+Where does the data on this page come from?
Every value is transcribed from Tesoro Viejo Master Mwc, Inc. — San Jose, 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 Tesoro Viejo Master Mwc, Inc. — San Jose, 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.