No open EPA violations as of 2026-10-15.
EPA record checked 2026-10-06
From EPA's record for OH3102612. PurityMap is independent of Greater Cincinnati Water Works.
Every community water system publishes one each year.
Read the report ↗As listed in EPA's records. Your water bill names your supplier.
Share of each town's residents (2020 Census) inside this system's mapped service area. A town can have more than one supplier, so check your water bill.
A ZIP code is a postal area, not a water service area. Your water bill names your supplier.
Are you this utility? Correct this listing →
32 results are on record. These 5 come first: results above a listed reference, then those closest to a legal limit.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 6.1 ng/L | 4.0 ng/L federal MCL (2024) | Above EPA's 2024 limit (one sample) | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Water hardness | 7.8 gpg | Aesthetic, no federal health limit | Above a secondary/aesthetic reference | 2025 | Greater Cincinnati Water Works (GCWW) 2025 Consumer Confidence Report (CCR) |
| Lead (90th percentile) | 2.05 µg/L | 15 µg/L federal action level | Below the listed reference | 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 | Within the referenced health-based guidance value | 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 | Detected, no limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| 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 | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| 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 | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| 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 | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| 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 | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| 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 | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| 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 | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-05-10 to 2024-02-05 | UCMR5 Analytical Results: CINCINNATI PUBLIC WATER SYSTEM (OH3102612) |
0health-based violations in the last 10 years · none open as of 2026-10-15
From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit. Meeting a federal limit is a compliance fact, not a health clearance.
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 (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 Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 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.
Tested your own tap? Read your results →
★ Best choice: Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200), certified for PFOS and lead.
| Pick | Product | Certification | Price | Link |
|---|---|---|---|---|
| ★ Best choice | Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200) | Certified for PFOS (NSF/ANSI 53, WQA) | $$ | Check price on Amazon |
| Also good | Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M) | Certified for PFOS (NSF/ANSI 53, WQA) | $$ | Check price at Aquasana |
| Also good | Aquasana Clean Water Machine Countertop Filter (AQ-CWM2) | Certified for PFOS (NSF/ANSI 53, WQA) | $$ | Check price at Aquasana |
★ Best choice: HealthShield™, certified for PFOS.
| Pick | Product | Certification | Price | Link |
|---|---|---|---|---|
| ★ Best choice | HealthShield™ | Certified for PFOS (NSF/ANSI 53, WQA) | $$$$ | Check price at Aquasana |
| $ Budget pick | iSpring WGB32B-PFKS PFAS & Heavy Metals Whole House FilterUse code REFISPRING at checkout: 10% off your first iSpring order. | Brand lab-tested for PFAS, not independently certified for PFOS, Perfluorobutanesulfonic acid (PFBS) and Perfluorobutanoic acid (PFBA) | $$$ | Check price at iSpring |
Also: lead picks →
PurityMap earns a commission from these links. "Best choice" and "Budget pick" go to certified products first; commission never decides them. As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Lead service lines
Greater Cincinnati Water Works reported 34,673 lead and 44 galvanized service lines to replace in EPA’s inventory (2026Q2). Many utilities replace these lines for free or share the cost. Ask Greater Cincinnati Water Works whether your home’s line is on its list before you pay anyone.
Local help
Call to be connected with a local plumbing provider about lead service lines, repiping or fixture replacement.
One email when a new sampling round is published or a result moves across its reference.
Follow this water →Its phone number on EPA record is 513-591-7968 and its mailing address is GREATER CINCINNATI WATER WORKS, CINCINNATI, OH 45230. These details come from the system's EPA record.
PurityMap has no verified website for Greater Cincinnati Water Works. Its mailing address on EPA record is GREATER CINCINNATI WATER WORKS, CINCINNATI, OH 45230. Your water bill lists the ways to pay. PurityMap does not take payments.
EPA's records list Greater Cincinnati Water Works as serving Cincinnati, Ohio. Your water bill names your supplier.
PurityMap's record for Greater Cincinnati Water Works holds results for 29 PFAS substances. 3 were detected, and none is above a federal legal limit. Each result links to its source in the city report.
No open EPA violations as of 2026-10-15: that is what EPA's record shows for Greater Cincinnati Water Works. The record comes from EPA's SDWIS compliance database.
Greater Cincinnati Water Works is on EPA record as drawing from surface water.
Start with the hot-or-cold tap check. Where Greater Cincinnati Water Works reported something related, it's shown below.
Lead at Greater Cincinnati Water Works: 2.05 µg/L (90th percentile, 2026 monitoring period (still open)). Lead has no taste, so a taste neither shows nor rules it out.