# Monte Vista Wd — Montclair, Ca, CA — Drinking Water Quality (2023)

> Contaminant levels for the Monte Vista Wd — Montclair, Ca, CA public water system from its 2023 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/monte-vista-wd-montclair-ca/2023
- JSON API: https://www.thewatermap.com/api/water/ca/monte-vista-wd-montclair-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: 19
- Contaminants with a federal limit: 8
- 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 |
|---|---|---|---|---|---|
| HAA5 | Disinfection byproducts | 13 ug/L (Average) | System-wide | No federal limit | Within the limit |
| Perchlorate | Disinfection byproducts | 0.6 ug/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| TTHM | Disinfection byproducts | 59 ug/L (Average) | System-wide | No federal limit | Within the limit |
| Fluoride | Inorganic chemicals | 0.13 mg/L (Average) | System-wide | 4 mg/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 2.5 mg/L (Average) | System-wide | 10 mg/L (MCL) | Within the limit |
| Aluminum | Metals | 20 ug/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Arsenic | Metals | 2.3 ug/L (Average) | System-wide | No federal limit | Within the limit |
| Lead | Metals | 33 ug/L (Range) | System-wide | No federal limit | At or above the limit |
| Total Coliform | Microbial | Not detected % (Range) | System-wide | 0 % (Public health goal) | None detected |
| Chlorine Total | Other | 0.54 mg/L (Average) | System-wide | 4 mg/L (MCL) | Within the limit |
| Chromium | Other | Not detected ug/L (Range) | System-wide | No federal limit | None detected |
| Diquat | Other | 9 ug/L (Average) | System-wide | No federal limit | Within the limit |
| Turbidity | Physical & aggregate | 0–99.4 % (Range) | System-wide | No federal limit | Detected — no federal limit |
| Gross Alpha | Radionuclides | Not detected pCi/L (Average) | System-wide | 15 pCi/L (MCL) | Within the limit |
| Uranium | Radionuclides | Not detected pCi/L (Average) | System-wide | 20 pCi/L (MCL) | Detected — no federal limit |
| DBCP | VOCs & pesticides | 1 ng/L (Average) | System-wide | No federal limit | Within the limit |
| MTBE | VOCs & pesticides | Not detected ug/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Tetrachloroethylene | VOCs & pesticides | Not detected ug/L (Range) | System-wide | 5 ug/L (MCL) | None detected |
| Trichloroethylene | VOCs & pesticides | Not detected ug/L (Average) | System-wide | 5 ug/L (MCL) | Within the limit |

## What these contaminants are

- **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.
- **Perchlorate** — A chemical used in rocket fuel and fireworks that can also form during disinfection. Can interfere with thyroid hormone production; has no national enforceable limit but is regulated in some states.
- **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.
- **Aluminum** — A common element sometimes used as a treatment coagulant. Regulated only as a secondary (cosmetic) standard; high levels can discolor water.
- **Arsenic** — A naturally occurring element that also enters water from industry and agriculture. A known human carcinogen; long-term exposure is linked to skin, bladder, and lung cancer.
- **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.
- **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.
- **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.
- **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.
- **DBCP** — 1,2-dibromo-3-chloropropane — a banned soil fumigant pesticide. A probable human carcinogen; long-term exposure above the federal limit can cause reproductive harm.
- **Tetrachloroethylene** — An industrial solvent (PCE) used in dry cleaning and degreasing. A likely human carcinogen; long-term exposure above the federal limit can damage the liver and kidneys.
- **Trichloroethylene** — An industrial solvent (TCE) used in metal degreasing. A known human carcinogen; long-term exposure above the federal limit can damage the liver.

## 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._