# Tract 349 Mutual Water Co. — Cudahy, Ca, CA — Drinking Water Quality (2021)

> Contaminant levels for the Tract 349 Mutual Water Co. — Cudahy, Ca, CA public water system from its 2021 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/tract-349-mutual-water-co-cudahy-ca/2021
- JSON API: https://www.thewatermap.com/api/water/ca/tract-349-mutual-water-co-cudahy-ca/2021
- 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: 2021
- Contaminants measured: 14
- Contaminants with a federal limit: 9
- 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 |
|---|---|---|---|---|---|
| HAA5 | Disinfection byproducts | Not detected ug/L (Average) | Distribution System | No federal limit | None detected |
| TTHM | Disinfection byproducts | 3.3 ug/L (Average) | Distribution System | No federal limit | Within the limit |
| Fluoride | Inorganic chemicals | 0.3 mg/L (Average) | GROUNDWATER AVERAGE (j) | 4 mg/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 0.6 mg/L (Average) | GROUNDWATER AVERAGE (j) | 10 mg/L (MCL) | Within the limit |
| Aluminum | Metals | 0.04 mg/L (Average) | GROUNDWATER AVERAGE (j) | No federal limit | Detected — no federal limit |
| Arsenic | Metals | 1.9 ug/L (Average) | GROUNDWATER AVERAGE (j) | No federal limit | Within the limit |
| Barium | Metals | 0.15 mg/L (Average) | GROUNDWATER AVERAGE (j) | 2 mg/L (MCL) | Within the limit |
| Copper | Metals | 0.14 mg/L (90th percentile) | Distribution System | 1.3 mg/L (Action level) | Within the limit |
| Escherichia coli (E. coli) | Microbial | 0 (Average) | Distribution System Average # Positive | No federal limit | None detected |
| Total Coliform | Microbial | 0 (Range) | Distribution System Range Of # Positive | 0 (MCLG) | None detected |
| Chlorine Free | Other | 0.3 mg/L (Average) | Distribution System | 4 mg/L (MCL) | Within the limit |
| Combined Radium | Radionuclides | Not detected pCi/L (Range) | GROUNDWATER RANGE (j) | 0.019 pCi/L (MCLG) | None detected |
| Gross Alpha | Radionuclides | 2.4 pCi/L (Average) | GROUNDWATER AVERAGE (j) | 15 pCi/L (MCL) | Within the limit |
| Uranium | Radionuclides | 3.3 pCi/L (Average) | GROUNDWATER AVERAGE (j) | 20 pCi/L (MCL) | Detected — no federal 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.
- **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.
- **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.
- **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.
- **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 2026-06-04 from thewatermap.com._