ZIP Code 45409
High RiskPFAS above EPA limits detected
3 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.
14
PFAS Detected
3
Above EPA Limits
3
Water Systems
250%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 240% of limit
Detected: 9.60 ppt
PFHxS Exceeds EPA limit
0 ppt MCL: 10 ppt 107% of limit
Detected: 10.70 ppt
MONTGOMERY COUNTY WATER SERVICES 1 PWS
OH5701315 High RiskWater Type
GU
PFAS Detected
5
Above MCL
2
State
Ohio
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 9.60ppt | 240% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 10.70ppt | 107% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 5.20ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 5.00ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.20ppt | No federal limit | — | Unregulated |
OAKWOOD CITY PWS
OH5701915 Low LevelWater Type
Groundwater
PFAS Detected
4
Above MCL
0
State
Ohio
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFHxS Perfluorohexane sulfonic acid | 3.50ppt | 35% of limit
| 10 ppt | Below limit |
PFBS Perfluorobutane sulfonic acid | 5.30ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 5.30ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 3.80ppt | No federal limit | — | Unregulated |
DAYTON PUBLIC WATER SYSTEM
OH5703512 High RiskWater Type
GU
PFAS Detected
5
Above MCL
1
State
Ohio
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 10.00ppt | 250% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 9.80ppt | 98% of limit
| 10 ppt | Below limit |
PFPeA Perfluoropentanoic acid | 4.60ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.40ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.00ppt | No federal limit | — | Unregulated |
Note: ZIP code 45409 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.