Yuma County Water Quality: 4 Cities Ranked by the Records
Yuma County, Arizona: 4 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
LithiumDetected in 4 systems10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest150 µg/L
- CITY OF YUMA150 µg/LSample date: 2023-04-12 to 2024-01-16
- SAN LUIS CITY OF103 µg/LSample date: 2024-09-25 to 2025-08-25
- SOMERTON CITY OF97.7 µg/LSample date: 2023-08-29 to 2024-02-13
- FOOTHILLS WATER AND SEWER LLC94.9 µg/LSample date: 2023-06-14 to 2024-03-20
Lead (90th percentile)Detected in 3 systems of 4 tested15 µg/L federal action level · US EPAHighest1.1 µg/L
- CITY OF YUMA1.1 µg/LMonitoring period: 2022–2024
- SAN LUIS CITY OF1 µg/LMonitoring period: 2022–2024
- SOMERTON CITY OF1 µg/LMonitoring period: 2023–2025
- FOOTHILLS WATER AND SEWER LLCNot detectedMonitoring period: 2023–2025
29 PFAS tested, none detected in any systemShow
Tested in these 4 systems: CITY OF YUMA, FOOTHILLS WATER AND SEWER LLC, SAN LUIS CITY OF, SOMERTON CITY OF
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorobutanesulfonic acid (PFBS)
- Perfluorobutanoic acid (PFBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanesulfonic acid (PFHxS)
- Perfluorohexanoic acid (PFHxA)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanesulfonic acid (PFOS)
- Perfluorooctanoic acid (PFOA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluoropentanoic acid (PFPeA)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 4 cities above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in ArizonaLargest water systems
- YumaCITY OF YUMA · AZ0414024103,264 served
- San LuisSAN LUIS CITY OF · AZ041400539,705 served
- Fortuna FoothillsFOOTHILLS WATER AND SEWER LLC · AZ041400432,425 served
- SomertonSOMERTON CITY OF · AZ041401514,197 served
Frequently asked
How does Yuma County tap water compare across cities?
PurityMap ranks 4 cities in Yuma County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Somerton's main water system: SOMERTON CITY OF · PWSID AZ0414015 · Purity Score 99 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Yuma County cities had a PFAS sample above a 2024 EPA limit?
None of the 4 Yuma County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 0.
Is there lead in Yuma County tap water?
Utilities report lead as a 90th-percentile result from home taps. 3 of 4 Yuma County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
Follow Yuma County's water
Get an email when a city record in the county changes.
Record changes only
We email when places in Yuma County get new results. Unsubscribe any time.
Follow Yuma County's water →