# Yuma, AZ — Drinking Water Quality (2025)

> Contaminant levels for the Yuma, AZ public water system from its 2025 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/az/yuma/2025
- JSON API: https://www.thewatermap.com/api/water/az/yuma/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: 20
- Contaminants with a federal limit: 13
- 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 |
|---|---|---|---|---|---|
| Chlorine | Disinfectants | 0.57 mg/L (Running annual avg) | System-wide | 4 mg/L (MRDL) | Within the limit |
| Chlorite | Disinfection byproducts | 0.05 mg/L (Running annual avg) | System-wide | 1 mg/L (MCL) | Within the limit |
| HAA5 | Disinfection byproducts | 17 ug/L (Running annual avg) | System-wide | No federal limit | Detected — no federal limit |
| TTHM | Disinfection byproducts | 79 ug/L (Running annual avg) | System-wide | No federal limit | Detected — no federal limit |
| Fluoride | Inorganic chemicals | 0.41 mg/L (Reported level) | Main Street | 4 mg/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 0.42 mg/L (Reported level) | Main Street | 10 mg/L (MCL) | Within the limit |
| Arsenic | Metals | 1.7 ug/L (Reported level) | Agua Viva | 10 ug/L (MCL) | Within the limit |
| Barium | Metals | 0.12 mg/L (Reported level) | Agua Viva | 2 mg/L (MCL) | Within the limit |
| Copper | Metals | 0.073 mg/L (90th percentile) | At the tap | 1.3 mg/L (Action level) | Within the limit |
| Lead | Metals | 1.1 ug/L (90th percentile) | At the tap | 15 ug/L (Action level) | Within the limit |
| Lithium | Metals | 110 ug/L (Average) | Agua Viva | No federal limit | Detected — no federal limit |
| Nickel | Metals | 1.9 ug/L (Reported level) | Agua Viva | No federal limit | Detected — no federal limit |
| Selenium | Metals | 2.7 ug/L (Reported level) | Main Street | 50 ug/L (MCL) | Within the limit |
| Sodium | Metals | 110 mg/L (Reported level) | Agua Viva | No federal limit | Detected — no federal limit |
| Escherichia coli (E. coli) | Microbial | 0 (Reported level) | System-wide | 0 (MCL) | None detected |
| Total Coliform | Microbial | 0.15 (Reported level) | System-wide | 5 (MCL) | Within the limit |
| PFAS | PFAS ("forever chemicals") | Not detected ng/L (Average) | Main Street | No federal limit | None detected |
| TOC | Physical & aggregate | 1.31–1.38 (Range) | Quarterly Running Annual Average | No federal limit | Detected — no federal limit |
| Combined Radium | Radionuclides | 0.554 pCi/L (Reported level) | Agua Viva | 5 pCi/L (MCL) | Within the limit |
| Gross Alpha | Radionuclides | 12.5 pCi/L (Reported level) | Agua Viva | 15 pCi/L (MCL) | Approaching the limit |

## What these contaminants are

- **Chlorine** — A disinfectant added to drinking water to kill bacteria and viruses. Effective and necessary, but high residual levels can cause taste and odor issues; the EPA caps the residual disinfectant 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.
- **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.
- **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.
- **Lithium** — A naturally occurring element found in some groundwater. No enforceable federal limit; on the EPA contaminant candidate list for further study.
- **Nickel** — A metal from natural deposits and industrial discharge. Long-term exposure can cause skin and other effects; monitored under EPA rules.
- **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.
- **Sodium** — A naturally occurring salt component. Not federally regulated for health; relevant for people on sodium-restricted diets.
- **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.
- **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.
- **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.

## 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 2026-05-25 from thewatermap.com._