Drinking water quality · 2025
What's in Yuma, AZ tap water
20 contaminants were measured in the Yuma, AZ water system's 2025 annual report. Each is shown below against its federal limit.
- Reporting year
- 2025
- Contaminants measured
- 20
- Over federal limit
- 0
- Approaching the limit
- 3
- Service area
- AZ
Where your water comes from · EPA SDWIS
Yuma, AZ's drinking water comes from ground water, drawn from 6 sources.
Source
- IN-C1402401SI - YUMA MAIN CANAL
- WL-55-202044
- WL-55-805921
- IN-C1402402SI - GILA GRAVITY B CANAL
- + 2 more
Treatment
- TP001 - CL2, CLO2
- TP002 - CL2, CLO2
- TP003 - 4LOG
Distribution
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Disinfectant level exceededHealth-based22 violations on record · most recent Mar 2022resolved
- Treatment technique violationHealth-based1 violation on record · most recent Oct 2021resolved
- Maximum contaminant level exceededHealth-based1 violation on record · most recent Apr 1989resolved
- Other1 violation on recordresolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 79 ug/LRunning annual avgSystem-wide | None set | Approaching the limit |
| Chlorite | 0–0.8 mg/LReported levelAgua Viva | 1 mg/LMCL | Approaching the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 17 ug/LRunning annual avgSystem-wide | None set | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 12.5 pCi/LReported levelAgua Viva | 15 pCi/LMCL | Approaching the limit |
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0.554 pCi/LReported levelAgua Viva | 5 pCi/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 1.7 ug/LReported levelAgua Viva | None set | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 1.1 ug/L90th percentileAt the tap | None set | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.12 mg/LReported levelAgua Viva | 2 mg/LMCL | Within the limit |
| CopperA metal that enters water from corroding household plumbing. | 0.073 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| SeleniumA trace element from natural deposits and industrial discharge. | 2.7 ug/LReported levelMain Street | None set | Within the limit |
| LithiumA naturally occurring element found in some groundwater. | 110 ug/LAverageAgua Viva | None set | Detected — no federal limit |
| NickelA metal from natural deposits and industrial discharge. | 1.9 ug/LReported levelAgua Viva | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 110 mg/LReported levelMain Street | None set | Detected — no federal limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.57 mg/LRunning annual avgSystem-wide | 4 mg/LMCL | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.41 mg/LReported levelMain Street | 4 mg/LMCL | Within the limit |
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 0.42 mg/LReported levelMain Street | 10 mg/LMCL | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0Reported levelSystem-wide | None set | None detected |
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0.15 %Reported levelSystem-wide | None set | Detected — no federal limit |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFAS | Not detected ng/LRangeMain Street | None set | None detected |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 1.31–1.38RangeQuarterly Running Annual Average | None set | Detected — no federal limit |
People also ask about Yuma, AZ's water
+Is Yuma, AZ tap water safe to drink in 2025?
Every one of the 20 contaminants measured in Yuma, AZ's 2025 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Yuma, AZ tap water?
20 contaminants were measured in Yuma, AZ's 2025 Consumer Confidence Report, spanning metals, disinfection byproducts, and inorganic chemicals. 8 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Are any contaminants in Yuma, AZ tap water approaching the federal limit?
3 contaminants are between 80% and 100% of the federal limit in this report: TTHM, Gross Alpha, and Chlorite. Approaching means measured but not in violation — a margin that can close quickly if conditions change.
+Where does the data on this page come from?
Every value is transcribed from Yuma, AZ's 2025 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Yuma, AZ's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2025 report; a new report will replace it once the utility publishes its next annual update.