PFOS
1.5× the limitPerfluorooctanesulfonic acid
6.1ng/L
Each block = 4.0 ng/L federal MCL (2024)
EPA UCMR 5 · sampled 2023Evidence
City water report · 2026
Is Cincinnati Tap Water Safe? 2026 Water Quality Report
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. Cincinnati Public Water System serves 750,200 residents.
Likely match, check your bill
CINCINNATI PUBLIC WATER SYSTEM serves Cincinnati
Your water bill or annual water quality report names your actual supplier.
- Source
- Surface water
- Lead service lines
- 34,673 lead, 44 galvanized, 45 unknown
- CINCINNATI PUBLIC WATER SYSTEMThis reportOH3102612 · 750,200 served
Your water utility
What stands out
One PFAS above the 2024 federal limit
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.
Coverage by group
31 results on record- PFAS (forever chemicals)1 above · 2 detected · 26 not detected
- Metals & lead1 detected
- Disinfection by-productsNot monitored
- Other1 not detected
Every detected result
4 detected results, by distance from their limit
CINCINNATI PUBLIC WATER SYSTEM (EPA PWSID OH3102612) delivers surface water to 750,200 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.
- Perfluorooctanesulfonic acid (PFOS)EPA UCMR 5 · 20234.0 ng/L federal MCL (2024)6.1ng/LAbove limit
- Lead (90th percentile)EPA SDWIS (Lead & Copper Rule) · 202615 µg/L federal action level2.06µg/LWithin reference
- Perfluorobutanesulfonic acid (PFBS)EPA UCMR 5 · 20232,000 ng/L EPA health advisory (screening, not a legal limit)4.1ng/LWithin reference
- Perfluorobutanoic acid (PFBA)EPA UCMR 5 · 2023No federal or state limit; shown for transparency5.2ng/LDetected · no limit
27 other contaminants tested, none detected
- 11Cl-PF3OUdS
- 4:2 FTS
- 6:2 FTS
- 8:2 FTS
- 9Cl-PF3ONS
- ADONA
- HFPO-DA (GenX)
- NEtFOSAA
- NFDHA
- NMeFOSAA
- PFDA
- PFDoA
- PFEESA
- PFHpA
- PFHpS
- PFHxA
- PFHxS
- PFMBA
- PFMPA
- PFNA
- PFOA
- PFPeA
- PFPeS
- PFTA
- PFTrDA
- PFUnA
- Lithium
Track record
0health-based violations in the last 10 years
From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit.
Not in this recordDisinfection by-products weren't monitored in this dataset
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.
What you can do
Test first, then treat what was found
- 01 · TestTest your own tap
Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
Certified labHow to test your tap → - 02 · Treat PFASReverse osmosis, or carbon certified for PFAS
PFOS 6.1 ng/L, above the 4 ng/L limit (+2 more PFAS detected)
NSF/ANSI 58 or 53, with PFOS/PFBS/PFBA named on the listingTreatment for PFAS → - 03 · LeadLead-certified carbon filter, or reverse osmosis
lead 2.06 µg/L, below the 15 µg/L action level (detected below the limit); 34,673 lead service lines; 44 galvanized lines to replace (context, not a tap measurement)
NSF/ANSI 53 (lead)Treatment for Lead →
Test your own tap
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Screening: quick check, not lab-grade
Safe Home DIY Lead in Drinking Water Combo Test Kit
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
- Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Labs Basic Water Quality Test Kit
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
- Analyzed by Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638
- Turnaround: 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Commercial
Certified for a concern found here
Each card names which Cincinnati 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.
Under-Sink Filter
Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorobutanoic acid (PFBA)
Not suitable for (5)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
- Renters who can't modify plumbing
Countertop System
Aquasana Clean Water Machine Countertop Filter (AQ-CWM2)
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorobutanoic acid (PFBA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
See all 9 products certified for a Cincinnati concern →
Countertop System
AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorobutanoic acid (PFBA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Under-Sink Filter
Under-Sink Reverse-Osmosis System
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorobutanoic acid (PFBA)
Not suitable for (5)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
- Renters who can't modify plumbing
Under-Sink Filter
Waterdrop G3P600 Tankless Reverse-Osmosis System
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorobutanoic acid (PFBA)
Not suitable for (5)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
- Renters who can't modify plumbing
Refrigerator Filter
Whirlpool Filter 3 Refrigerator Water Filter (WHR3RXD1)
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorobutanoic acid (PFBA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Water Pitcher
Culligan ZeroWater 10-Cup Pitcher (ZEROP10)
- Lead: eligible, evidence match
- Not established: PFOS, Perfluorobutanesulfonic acid (PFBS), Perfluorobutanoic acid (PFBA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Faucet Attachment
Faucet-Mount Filter
- Lead: eligible, evidence match
- Not established: PFOS, Perfluorobutanesulfonic acid (PFBS), Perfluorobutanoic acid (PFBA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Under-Sink Filter
Under-Sink Carbon Block Filter
- Lead: eligible, evidence match
- Not established: PFOS, Perfluorobutanesulfonic acid (PFBS), Perfluorobutanoic acid (PFBA)
Not suitable for (4)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
Questions
Frequently asked questions
Is Cincinnati tap water safe to drink?
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Cincinnati, PFOS 6.1 ng/L was measured above the 4 ng/L federal limit in EPA's 2024 testing; the lead 90th-percentile result was 2.06 µg/L against the 15 µg/L action level. CINCINNATI PUBLIC WATER SYSTEM (PWSID OH3102612) has a Purity Score of 65/100 (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.
Who provides tap water in Cincinnati?
CINCINNATI PUBLIC WATER SYSTEM (PWS ID OH3102612) is the public water system on record for Cincinnati, Ohio, serving about 750,200 people. Confirm the utility on your water bill before acting on a specific finding.
Where does Cincinnati get its drinking water?
Surface water (primary source of record in EPA SDWIS).
Are PFAS "forever chemicals" in Cincinnati's water?
Yes. In EPA's UCMR 5 testing (2023-05-10 to 2024-02-05), PFOS was measured at 6.1 ng/L against a 4 ng/L federal limit. PFBS (4.1 ng/L, below the 2,000 ng/L EPA health advisory) was also detected. PFBA (5.2 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.
Is there lead in Cincinnati's tap water?
CINCINNATI PUBLIC WATER SYSTEM's most recent lead 90th-percentile result (2026) was 2.06 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
What does the latest Cincinnati water report show?
PurityMap's current record for Cincinnati holds 31 findings: 1 above a reference, 2 detected within the reference, 1 detected with no limit and 27 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 this water
Follow Cincinnati'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.
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Sources and dataAll 31 records and their sourcesEPA UCMR 5 · EPA SDWIS (Lead & Copper Rule)
| Contaminant | Result | Benchmark | Sampled | Source |
|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 6.1 ng/L | 4.0 ng/L federal MCL (2024) | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Lead (90th percentile) | 2.06 µg/L | 15 µg/L federal action level | 2026–2026 monitoring period (still open) | Lead & Copper Rule 90th-percentile: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluorobutanesulfonic acid (PFBS) | 4.1 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluorobutanoic acid (PFBA) | 5.2 ng/L | No federal or state limit; shown for transparency | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
27 other contaminants tested — none detected
Perfluorooctanesulfonic acid (PFOS)
- Result
- 6.1 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Sampled
- 2023-05-10 to 2024-02-05
- Result
- 2.06 µg/L
- Benchmark
- 15 µg/L federal action level
- Sampled
- 2026–2026 monitoring period (still open)
Perfluorobutanesulfonic acid (PFBS)
- Result
- 4.1 ng/L
- Benchmark
- 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit
- Sampled
- 2023-05-10 to 2024-02-05
- Result
- 5.2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
27 other contaminants tested — none detected
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Result
- < 2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Result
- < 5 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Sampled
- 2023-05-10 to 2024-02-05
- Result
- < 9 µg/L
- Benchmark
- 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit
- Sampled
- 2023-05-10 to 2024-02-05
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Result
- < 6 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Result
- < 20 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Perfluoro-3-methoxypropanoic acid (PFMPA)
- Result
- < 4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Perfluoro-4-methoxybutanoic acid (PFMBA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Perfluorododecanoic acid (PFDoA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Perfluoroheptanesulfonic acid (PFHpS)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Perfluoroheptanoic acid (PFHpA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Perfluorohexanesulfonic acid (PFHxS)
- Result
- < 3 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Sampled
- 2023-05-10 to 2024-02-05
Perfluorohexanoic acid (PFHxA)
- Result
- < 3 ng/L
- Benchmark
- 400,000 ng/L Michigan EGLE state MCL (strictest US state)
- Sampled
- 2023-05-10 to 2024-02-05
- Result
- < 4 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Sampled
- 2023-05-10 to 2024-02-05
- Result
- < 4 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Sampled
- 2023-05-10 to 2024-02-05
Perfluoropentanesulfonic acid (PFPeS)
- Result
- < 4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Perfluoropentanoic acid (PFPeA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Perfluorotetradecanoic acid (PFTA)
- Result
- < 8 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Perfluorotridecanoic acid (PFTrDA)
- Result
- < 7 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
Perfluoroundecanoic acid (PFUnA)
- Result
- < 2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-05-10 to 2024-02-05
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: CINCINNATI PUBLIC WATER SYSTEM (OH3102612)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: CINCINNATI PUBLIC WATER SYSTEM (OH3102612)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Something off with your water's smell, color or taste?
Start with the hot-or-cold tap check. Where Cincinnati Public Water System reported something related, it's shown below.
- Rotten-egg smell
- Cloudy or milky water
- Chlorine smell
- Brown or yellow water
- Metallic taste
Lead at Cincinnati Public Water System: 2.06 µg/L (90th percentile, 2026 monitoring period (still open)). Lead has no taste, so a taste neither shows nor rules it out.