# San Antonio Water Company — Upland, Ca, CA — Drinking Water Quality (2023)

> Contaminant levels for the San Antonio Water Company — Upland, Ca, CA public water system from its 2023 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/san-antonio-water-company-upland-ca/2023
- JSON API: https://www.thewatermap.com/api/water/ca/san-antonio-water-company-upland-ca/2023
- Source: the utility's annual Consumer Confidence Report (CCR)
- Verification: transcribed by a model, cross-checked by a second model, approved before publishing
- Reporting year: 2023
- Contaminants measured: 16
- Contaminants with a federal limit: 4
- Contaminants at or above the federal limit: 0
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| Chloride | Inorganic chemicals | 0–1.4 ug/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| Fluoride | Inorganic chemicals | 0–0.35 mg/L (Range) | System-wide | 4 mg/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 0–0.54 mg/L (Range) | System-wide | 10 mg/L (MCL) | Within the limit |
| Calcium | Metals | 42–64 mg/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| Lead | Metals | Not detected ug/L (Range) | System-wide | No federal limit | None detected |
| Magnesium | Metals | 0–7.81 mg/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| Vanadium | Metals | 0–0.79 ug/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| Escherichia coli (E. coli) | Microbial | 0 (Reported level) | SAW-CO Water | No federal limit | None detected |
| Total Coliform | Microbial | 0 % (Reported level) | SAW-CO Water | No federal limit | None detected |
| Nitrate Nitrite | Other | 0–0.48 ug/L (Range) | System-wide | No federal limit | Within the limit |
| Bicarbonate | Physical & aggregate | 0–156.2 (Range) | System-wide | No federal limit | Detected — no federal limit |
| Hardness | Physical & aggregate | 0–124.99 mg/L (Range) | System-wide | No federal limit | Detected — no federal limit |
| Odor | Physical & aggregate | 1 (Reported level) | SAW-CO Water | No federal limit | Detected — no federal limit |
| pH | Physical & aggregate | 7.5–7.6 (Range) | System-wide | No federal limit | Detected — no federal limit |
| Gross Alpha | Radionuclides | 0–0.72 pCi/L (Range) | System-wide | 15 pCi/L (MCL) | Within the limit |
| Uranium | Radionuclides | 0–6 (Range) | System-wide | 20 (MCL) | Detected — no federal limit |

## What these contaminants are

- **Chloride** — A naturally occurring salt compound. Regulated only as a secondary (cosmetic) standard; high levels cause a salty taste and can corrode pipes.
- **Fluoride** — A mineral often added to drinking water to help prevent tooth decay. Beneficial at low levels, but long-term exposure above the federal limit can cause bone disease and tooth mottling.
- **Nitrate** — A compound from fertilizer runoff, septic systems, and erosion of natural deposits. Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.
- **Calcium** — A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
- **Lead** — A toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.
- **Magnesium** — A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
- **Escherichia coli (E. coli)** — Escherichia coli — bacteria found in the gut of humans and animals. Its presence in drinking water indicates fecal contamination and a real risk of waterborne illness.
- **Total Coliform** — A group of bacteria used as an indicator of overall water-system sanitation. Coliforms themselves are usually harmless, but their presence signals that disease-causing organisms could enter the system.
- **Hardness** — A measure of dissolved calcium and magnesium minerals. Not federally regulated for health; affects scaling, soap use, and taste.
- **Odor** — A measure of detectable smell in the water. Regulated only as a secondary (cosmetic) standard.
- **pH** — A measure of how acidic or basic the water is. Regulated only as a secondary standard; very low or high pH can corrode pipes or affect taste.
- **Gross Alpha** — Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances. Long-term exposure above the federal limit increases cancer risk.
- **Uranium** — A naturally occurring radioactive metal from erosion of natural deposits. Long-term exposure above the federal limit can damage the kidneys and increase cancer risk.

## How to read this

- A water-quality report covers an entire service area, not a single address.
- 'Federal limit' is the EPA standard (MCL, action level, treatment technique, etc.) that the measured level is compared against.
- 'At or above the federal limit' means the utility's own reported figure met or exceeded that standard.

_Figures are the utility's own published numbers. Generated 2026-06-04 from thewatermap.com._