# City of Sunnyvale, CA — Drinking Water Quality (2025)

> Contaminant levels for the City of Sunnyvale, CA public water system from its 2025 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/sunnyvale/2025
- JSON API: https://www.thewatermap.com/api/water/ca/sunnyvale/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: 15
- Contaminants with a federal limit: 5
- 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 |
|---|---|---|---|---|---|
| Bromodichloromethane | Disinfection byproducts | 7.095 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Bromoform | Disinfection byproducts | 1.9049999999999998 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Chloroform | Disinfection byproducts | 26.62357142857143 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Dibromochloromethane | Disinfection byproducts | 6.755357142857143 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| HAA5 | Disinfection byproducts | 25.869444444444444 UG/L (Average) | Distribution | 60 UG/L (MCL) | Within the limit |
| TTHM | Disinfection byproducts | 42.1 UG/L (Average) | Distribution | 80 UG/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 3.2366666666666664 MG/L (Average) | Source water | 10 MG/L (MCL) | Within the limit |
| Chromium, Hexavalent | Metals | 1.56 UG/L (Average) | Source water | 10 UG/L (MCL) | Within the limit |
| Copper | Metals | 220 UG/L (90th percentile) | Distribution | 1300 UG/L (Al) | Within the limit |
| Lead | Metals | Not detected UG/L (Highest single sample) | Distribution | No federal limit | None detected |
| Dbaa | Other | 2.7916666666666665 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Dcaa | Other | 13.030555555555557 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Mbaa | Other | 0.5305555555555556 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Mcaa | Other | 1.2527777777777778 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |
| Tcaa | Other | 9.894444444444444 UG/L (Average) | Distribution | No federal limit | Detected — no federal limit |

## What these contaminants are

- **Bromodichloromethane** — A trihalomethane disinfection byproduct. Counted within regulated total trihalomethanes; long-term exposure is associated with cancer and reproductive effects.
- **Bromoform** — A trihalomethane disinfection byproduct. Counted within regulated total trihalomethanes; long-term exposure is associated with liver and kidney effects.
- **Chloroform** — A trihalomethane formed when chlorine reacts with organic matter in water. A component of regulated total trihalomethanes; long-term exposure is linked to liver and kidney effects.
- **Dibromochloromethane** — A trihalomethane disinfection byproduct. Part of regulated total trihalomethanes; long-term exposure is linked to nervous-system, liver, and kidney effects.
- **HAA5** — Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. Long-term exposure above the federal limit is associated with an increased cancer risk.
- **TTHM** — Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
- **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.
- **Chromium, Hexavalent** — Hexavalent chromium ('chromium-6') — the more toxic form of chromium. A known carcinogen by inhalation; regulated nationally only within the total-chromium limit, with stricter limits in some states.
- **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.

## 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._