ZIP Code 85705
High RiskPFAS above EPA limits detected
2 compounds exceed EPA Maximum Contaminant Levels in water serving this ZIP code. Standard pitcher filters like Brita do not remove PFAS. See filter recommendations below.
10
PFAS Detected
2
Above EPA Limits
3
Water Systems
150%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 150% of limit
Detected: 6.00 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 125% of limit
Detected: 5.00 ppt
FLOWING WELLS IRRIGATION DISTRICT
AZ0410051 High RiskWater Type
Groundwater
PFAS Detected
7
Above MCL
2
State
Arizona
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 6.00ppt | 150% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 5.00ppt | 125% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 9.00ppt | 90% of limit
| 10 ppt | Below limit |
lithium | 228000.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 4.00ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 4.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 3.00ppt | No federal limit | — | Unregulated |
RAY WATER COMPANY INC
AZ0410095 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Arizona
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 46000.00ppt | No federal limit | — | Unregulated |
TUCSON CITY OF
AZ0410112 Low LevelWater Type
Groundwater
PFAS Detected
2
Above MCL
0
State
Arizona
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 63700.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 8.10ppt | No federal limit | — | Unregulated |
Note: ZIP code 85705 is served by 3 separate water utilities.
Results above show data for each system independently.
Data source: EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5) — January 2026 release.
UCMR 5 tested ~10,000 public water systems serving more than 25 people between 2023-2025 for 29 PFAS compounds.
Detection values represent the highest single-sample result measured at entry points to the distribution system.