What was found in Yuma's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 320 µg/L 3.2% of the EPA limit 10000 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2019
Highest in the city: 9337.5 µg/L — G & L MOBILE PARK · 90 people · 2019 | 17/20 | SYR4 |
| Nitrate-Nitrite | 292 µg/L 2.9% of the EPA limit 10000 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2019
Highest in the city: 8659.5 µg/L — LOST TRAVELER RV PARK · 200 people · 2019 | 10/20 | SYR4 |
| Copper | 126 µg/L 9.7% of the EPA limit 1300 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2018
Highest in the city: 5217 µg/L — MOUNTAIN VIEW MOBILE VILLAGE · 75 people · 2019 | 18/20 | SYR4 |
| Fluoride | 498 µg/L 12% of the EPA limit 4000 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2019
Highest in the city: 3085 µg/L — FISHERS LANDING RESORT · 402 people · 2017 | 18/20 | SYR4 |
| Nitrite | 2340 µg/L 234% of the EPA limit, at the 95th percentile of samples — 1000 µg/L Highest in the city: CS TIERRA MESA ESTATES WATER COMPANY · 632 people · 2018 | 1/20 | SYR4 |
| Barium | 120 µg/L 6% of the EPA limit 2000 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2019
Highest in the city: 431 µg/L — FOOTHILLS WATER AND SEWER LLC · 32,425 people · 2019 | 19/20 | SYR4 |
| Chlorite | 416 µg/L 42% of the EPA limit 1000 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2019 | 2/20 | SYR4 |
| Lithium | 150 µg/L No EPA limit set Main supplier: CITY OF YUMA · 103,264 people · 2024
Highest in the city: 210 µg/L — CS TIERRA MESA ESTATES WATER COMPANY · 632 people · 2023 | 6/20 | UCMR-5 |
| Lead | 8.59 µg/L 57% of the EPA limit 15 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2018
Highest in the city: 117.2 µg/L — MOUNTAIN VIEW MOBILE VILLAGE · 75 people · 2019 | 18/20 | SYR4 |
| TTHM | 86.9 µg/L 109% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2019
Highest in the city: 100 µg/L — FOOTHILLS WATER AND SEWER LLC · 32,425 people · 2019 | 6/20 | SYR4 |
| Combined Uranium | 3.925 µg/L 13% of the EPA limit 30 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2017
Highest in the city: 54.14 µg/L — SUN LEISURE ESTATES IMPROVEMENT DISTRICT · 143 people · 2019 | 8/20 | SYR4 |
| Arsenic | 3 µg/L 30% of the EPA limit 10 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2019
Highest in the city: 44.249 µg/L — CS EL PRADO WATER COMPANY · 404 people · 2019 | 16/20 | SYR4 |
| Total Haloacetic Acids (HAA5) | 17 µg/L 28% of the EPA limit 60 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2019
Highest in the city: 36 µg/L — FOOTHILLS WATER AND SEWER LLC · 32,425 people · 2019 | 6/20 | SYR4 |
| Selenium | 11.875 µg/L 24% of the EPA limit 50 µg/L Highest in the city: SUN LEISURE ESTATES IMPROVEMENT DISTRICT · 143 people · 2019 | 7/20 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.2000 pCi/L 1.3% of the EPA limit 15 pCi/L Main supplier: CITY OF YUMA · 103,264 people · 2017
Highest in the city: 6.95 pCi/L — SUN LEISURE ESTATES IMPROVEMENT DISTRICT · 143 people · 2018 | 7/20 | SYR4 |
| Xylenes, Total | 5.8 µg/L 0.1% of the EPA limit 10000 µg/L Highest in the city: CS GREEN ACRES WATER COMPANY · 105 people · 2019 | 1/20 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 4.41 µg/L 74% of the EPA limit 6 µg/L Highest in the city: FOOTHILLS WATER AND SEWER LLC · 32,425 people · 2019 | 2/20 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Main supplier: CITY OF YUMA · 103,264 people · 2019
Highest in the city: 3.975 µg/L — FISHERS LANDING RESORT · 402 people · 2017 | 7/20 | SYR4 |
| Thallium, Total | 1.9 µg/L 95% of the EPA limit 2 µg/L Highest in the city: YUMA WEST MHP · 30 people · 2015 | 1/20 | SYR4 |
| Combined Radium (-226 And -228) | 1.74 pCi/L 35% of the EPA limit 5 pCi/L Highest in the city: SUN LEISURE ESTATES IMPROVEMENT DISTRICT · 143 people · 2019 | 5/20 | SYR4 |
| Ethylbenzene | 1 µg/L 0.1% of the EPA limit 700 µg/L Highest in the city: CS GREEN ACRES WATER COMPANY · 105 people · 2019 | 1/20 | SYR4 |
| Toluene | 0.7500 µg/L 0.1% of the EPA limit 1000 µg/L Highest in the city: CS GREEN ACRES WATER COMPANY · 105 people · 2019 | 1/20 | SYR4 |
| Mercury | 0.2100 µg/L 11% of the EPA limit 2 µg/L Highest in the city: Quechan Utility · 5,660 people · 2019 | 1/20 | SYR4 |
| Antimony, Total | 0.1100 µg/L 1.8% of the EPA limit 6 µg/L Highest in the city: HOWARD CANTONMENT AREA · 1,500 people · 2017 | 1/20 | SYR4 |
| Lead | 0.0011 mg/L 7.3% of the EPA limit 0.0150 mg/L Main supplier: CITY OF YUMA · 103,264 people · 2024
Highest in the city: 0.0126 mg/L — JONES COOP WATER ASSOC · 35 people · 2018 | 19/20 | LCR |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0090 µg/L 4.5% of the EPA limit 0.2000 µg/L Highest in the city: Quechan Utility · 5,660 people · 2019 | 1/20 | SYR4 |
| PFHXS | 0.0031 µg/L No EPA limit set Highest in the city: USMC YUMA MAIN SYSTEM · 8,353 people · 2024 | 1/20 | UCMR-5 |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Yuma
| Supplier | Population served |
|---|---|
| CITY OF YUMA | 103,264 |
| FOOTHILLS WATER AND SEWER LLC | 32,425 |
| USMC YUMA MAIN SYSTEM | 8,353 |
| Quechan Utility | 5,660 |
| ASPC YUMA | 4,197 |
| HOWARD CANTONMENT AREA | 1,500 |
| SIERRA PACIFIC MOBILE MANOR | 816 |
| CS TIERRA MESA ESTATES WATER COMPANY | 632 |
| LAGUNA MOBILE HOME AND RV PARK | 450 |
| CS EL PRADO WATER COMPANY | 404 |
| FISHERS LANDING RESORT | 402 |
| LOST TRAVELER RV PARK | 200 |
| SUN LEISURE ESTATES IMPROVEMENT DISTRICT | 143 |
| CS RANCHEROS BONITOS WATER COMPANY | 120 |
| CS GREEN ACRES WATER COMPANY | 105 |
| G & L MOBILE PARK | 90 |
| MOUNTAIN VIEW MOBILE VILLAGE | 75 |
| RIVER RV RANCH | 71 |
| JONES COOP WATER ASSOC | 35 |
| YUMA WEST MHP | 30 |
Frequently asked questions about Yuma tap water
Is Yuma tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Yuma. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Yuma?
20 public water suppliers report drinking-water monitoring for Yuma, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Yuma's water?
The contaminants EPA monitoring detected in Yuma include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Nitrite. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.