# City of San Jose - Nsj/alviso — San Jose, Ca, CA — Drinking Water Quality (2023)

> Contaminant levels for the City of San Jose - Nsj/alviso — San Jose, Ca, CA public water system from its 2023 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/san-jose-nsj-alviso-san-jose-ca/2023
- JSON API: https://www.thewatermap.com/api/water/ca/san-jose-nsj-alviso-san-jose-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: 17
- Contaminants with a federal limit: 7
- 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 |
|---|---|---|---|---|---|
| Chloramine | Disinfectants | 3 mg/L (Average) | North San José/ Alviso (SFPUC Treated Water) | No federal limit | Within the limit |
| Bromate | Disinfection byproducts | 1.7 ug/L (Average) | Evergreen (Valley Water Treated Water) | No federal limit | Within the limit |
| HAA5 | Disinfection byproducts | 35 ug/L (Average) | North San José/ Alviso (SFPUC Treated Water) | No federal limit | Within the limit |
| TTHM | Disinfection byproducts | 42 ug/L (Average) | Evergreen (Valley Water Treated Water) | No federal limit | Within the limit |
| Fluoride | Inorganic chemicals | 0.8 mg/L (Average) | Evergreen (Valley Water Treated Water) | 4 mg/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 2.2 mg/L (Average) | Edenvale (Groundwater) | 10 mg/L (MCL) | Within the limit |
| Barium | Metals | 0.2 mg/L (Average) | North San José/ Alviso (Groundwater) | 2 mg/L (MCL) | Within the limit |
| Copper | Metals | 150 ug/L (90th percentile) | At the tap | 300 ug/L (Public health goal) | Within the limit |
| Lead | Metals | 0 ug/L (90th percentile) | At the tap | 0.2 ug/L (Public health goal) | None detected |
| Selenium | Metals | Not detected ug/L (Average) | North San José/ Alviso (Groundwater) | No federal limit | Within the limit |
| Cryptosporidium | Microbial | Not detected (Average) | North San José/ Alviso (SFPUC Treated Water) | No federal limit | Detected — no federal limit |
| Giardia lamblia | Microbial | 0.02 (Average) | North San José/ Alviso (SFPUC Treated Water) | No federal limit | Detected — no federal limit |
| Total Coliform | Microbial | 3 (Range) | Evergreen (Valley Water Treated Water) | No federal limit | Detected — no federal limit |
| Chromium | Other | 5.4 ug/L (Average) | Edenvale (Groundwater) | No federal limit | Within the limit |
| TOC | Physical & aggregate | 2 mg/L (Average) | Evergreen (Valley Water Treated Water) | No federal limit | Detected — no federal limit |
| Turbidity | Physical & aggregate | 2.1 NTU (Average) | North San José/ Alviso (SFPUC Treated Water) | 1 NTU (MCL) | At or above the limit |
| Gross Alpha | Radionuclides | 3.3 pCi/L (Average) | Evergreen (Valley Water Treated Water) | 15 pCi/L (MCL) | Within the limit |

## What these contaminants are

- **Chloramine** — A longer-lasting disinfectant made by combining chlorine with ammonia. Holds disinfection further into the pipe network, but is regulated under the same residual-disinfectant cap as chlorine.
- **Bromate** — A disinfection byproduct formed when bromide-containing water is treated with ozone. Classified as a probable human carcinogen; the EPA sets a strict maximum contaminant level.
- **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.
- **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.
- **Barium** — A metal from erosion of natural deposits and industrial discharge. Long-term exposure above the federal limit can raise blood pressure.
- **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.
- **Selenium** — A trace element from natural deposits and industrial discharge. Essential in tiny amounts, but long-term exposure above the federal limit can cause hair and fingernail loss and circulatory problems.
- **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.
- **TOC** — Total organic carbon — a measure of organic material dissolved in the water. Not harmful itself, but it is the raw material that forms disinfection byproducts; removal is a treatment requirement.
- **Turbidity** — A measure of cloudiness from suspended particles in the water. High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.
- **Gross Alpha** — Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances. Long-term exposure above the federal limit increases 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._