Perfluorooctanesulfonic acid
7.6ng/L
Each block = 4.0 ng/L federal MCL (2024)
Short answer: PFOS is above its federal limit (a 2024 limit that water systems have until at least 2029 to meet); 1 more is detected with no federal limit, and everything else measured is within its reference or not detected. Montgomery County Water Services 2 PWS serves 83,033 residents.
Your water bill or annual water quality report names your actual supplier.
The bar is drawn in blocks of the 4.0 ng/L federal MCL (2024), so the length shows how far above it the result sits.
7.6ng/L
Each block = 4.0 ng/L federal MCL (2024)
MONTGOMERY COUNTY WATER SERVICES 2 PWS (EPA PWSID OH5701503) delivers surface water to 83,033 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.
1health-based violation in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score.
No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.
Every filing is listed; the Track record score counts at most one per contaminant per year.
Resolved
to Resolved
A tap test can confirm levels at your home before you choose treatment.
PFOS 7.6 ng/L, above the 4 ng/L limit (+4 more PFAS detected)
Each card names which Trotwood findings its current certification covers, and which it doesn't.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.









PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Trotwood, PFOS 7.6 ng/L was measured above the 4 ng/L federal limit in EPA's 2024 testing. MONTGOMERY COUNTY WATER SERVICES 2 PWS (PWSID OH5701503) has a Purity Score of 58/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.
MONTGOMERY COUNTY WATER SERVICES 2 PWS (PWS ID OH5701503) is the public water system on record for Trotwood, Ohio, serving about 83,033 people. Confirm the utility on your water bill before acting on a specific finding.
Surface water (primary source of record in EPA SDWIS).
Yes. In EPA's UCMR 5 testing (2023-07-19 to 2024-05-06), PFOS was measured at 7.6 ng/L against a 4 ng/L federal limit. PFBS (3 ng/L, below the 2,000 ng/L EPA health advisory), PFHxA (5.2 ng/L, below the 400,000 ng/L state limit) and PFHxS (9.4 ng/L, below the 10 ng/L federal limit) were also detected. PFPeA (3.8 ng/L) was also detected; it has no federal or state limit. Reverse osmosis and filters certified to NSF/ANSI 53 for PFOA/PFOS reduce them at the tap.
Lead is not in Trotwood's current published record. Lead usually enters from a building's own pipes and fixtures, so a certified home test is the way to know yours.
PurityMap's current record for Trotwood holds 31 findings: 1 above a reference, 3 detected within the reference, 1 detected with no limit and 26 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.
Follow Trotwood's water
One email when a new sampling round is published, a result moves above or below its reference, or the system's score changes.
Double opt-in: we email a confirmation link. Unsubscribe anytime. No spam.
| Contaminant | Result | Benchmark | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 7.6 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluorohexanesulfonic acid (PFHxS) | 9.4 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluorobutanesulfonic acid (PFBS) | 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluorohexanoic acid (PFHxA) | 5.2 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluoropentanoic acid (PFPeA) | 3.8 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Contaminant | Result | Benchmark | Status | Sampled | Source |
|---|---|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Lead (90th percentile) | Non-Detect (ND) | 15 µg/L federal action level | Not detected above the reporting limit | 2025–2025 monitoring period | Lead & Copper Rule 90th-percentile: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-07-19 to 2024-04-17 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-04-17 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-04-17 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-04-17 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-04-17 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-07-19 to 2024-05-06 | UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503) |
Perfluorooctanesulfonic acid (PFOS)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorobutanesulfonic acid (PFBS)
Perfluorohexanoic acid (PFHxA)
Perfluoropentanoic acid (PFPeA)
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)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)
Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.
UCMR5 Analytical Results
UCMR5 Analytical Results: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: MONTGOMERY COUNTY WATER SERVICES 2 PWS (OH5701503)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Start with the hot-or-cold tap check. Where Montgomery County Water Services 2 PWS reported something related, it's shown below.
Lead at Montgomery County Water Services 2 PWS: not detected (90th percentile, 2025 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.