# Mesa Del Toro Mwc, CA — Drinking Water Quality (2025)

> Contaminant levels for the Mesa Del Toro Mwc, CA public water system from its 2025 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/mesa-del-toro-mwc/2025
- JSON API: https://www.thewatermap.com/api/water/ca/mesa-del-toro-mwc/2025
- 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: 2025
- Contaminants measured: 9
- Contaminants with a federal limit: 9
- Contaminants at or above the federal limit: 1
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| Nitrate | Inorganic chemicals | Not detected MG/L (Highest single sample) | Source water | 10 MG/L (MCL) | None detected |
| Copper | Metals | 1008.4000000000001 UG/L (90th percentile) | Distribution | 1300 UG/L (Al) | Within the limit |
| Lead | Metals | 3.7 UG/L (90th percentile) | Distribution | 15 UG/L (Al) | Within the limit |
| Manganese | Metals | 468.75 UG/L (Average) | Source water | 50 UG/L (MCL) | At or above the limit |
| Specific Conductance | Physical & aggregate | 1234.75 UMHO/CM (Average) | Source water | 1600 UMHO/CM (MCL) | Within the limit |
| Total Dissolved Solids | Physical & aggregate | 788 MG/L (Average) | Source water | 1000 MG/L (MCL) | Within the limit |
| Combined Radium | Radionuclides | 0.36966666666666664 PCI/L (Average) | Source water | 5 PCI/L (MCL) | Within the limit |
| Gross Alpha | Radionuclides | 4.205 PCI/L (Average) | Source water | 15 PCI/L (MCL) | Within the limit |
| Uranium | Radionuclides | Not detected PCI/L (Highest single sample) | Source water | 20 PCI/L (MCL) | None detected |

## What these contaminants are

- **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.
- **Copper** — A metal that enters water from corroding household plumbing. Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.
- **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.
- **Manganese** — A naturally occurring metal from soil and rock. No enforceable federal limit; high levels stain fixtures and laundry and can affect taste, with a health advisory for infants.
- **Specific Conductance** — A measure of how well water conducts electricity, which tracks dissolved mineral content. Not federally regulated for health; used as a proxy for total dissolved solids.
- **Total Dissolved Solids** — Total dissolved solids — the combined content of all dissolved minerals and salts. Regulated only as a secondary (cosmetic) standard; high levels affect taste and hardness.
- **Combined Radium** — Combined radium-226 and radium-228 — naturally occurring radioactive elements. Long-term exposure above the federal limit increases the risk of bone cancer.
- **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 2026-05-26 from thewatermap.com._