Drinking water quality · 2025
· Verified
· PWSID AZ0414024
What's in Yuma, AZ tap water
Every one of the 14 core regulated contaminants reported for Yuma, AZ came in below its federal limit.
- !3 contaminants within 20% of a limit
- !14 of 27 core regulated contaminants reported — 13 never appear in this report
- ✓Nothing over a federal limit
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −0 contaminants at or above a federal limit
- −12 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −6 health-based violations resolved in the last 5 years
- −8 core regulated contaminants never reported (14/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- TTHM99% of the federal limit79 ug/L · limit 80 ug/L
Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
higher than 90% of U.S. systems
- Gross Alpha83% of the federal limit12.5 pCi/L · limit 15 pCi/L
Long-term exposure above the federal limit increases cancer risk.
higher than 95% of U.S. systems
- Chlorite80% of the federal limit0–0.8 mg/L · limit 1 mg/L
higher than 90% of U.S. systems
+17 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| HAA5 | 17 ug/L | 60 ug/L |
| Arsenic | 1.7 ug/L | 10 ug/L |
| Chlorine | 0.57 mg/L | 4 mg/L |
| Combined Radium | 0.554 pCi/L | 5 pCi/L |
| Fluoride | 0.41 mg/L | 4 mg/L |
| Lead | 1.1 ug/L | 15 ug/L |
| Barium | 0.12 mg/L | 2 mg/L |
| Copper | 0.073 mg/L | 1.3 mg/L |
| Selenium | 2.7 ug/L | 50 ug/L |
| Nitrate | 0.42 mg/L | 10 mg/L |
| Lithium | 110 ug/L | — |
| Nickel | 1.9 ug/L | — |
| Sodium | 110 mg/L | — |
| Escherichia coli (E. coli) | 0 | — |
| Total Coliform | 0.15 % | — |
| PFAS | Not detected ng/L | — |
| TOC | 1.31–1.38 | — |
What this report doesn't tell you
13 of the 27 contaminants a community water system normally reports do not appear anywhere in Yuma, AZ's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
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 ↗