Butler County Water Quality: 6 Cities Ranked by the Records
Butler County, Ohio: 6 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
Perfluorooctanoic acid (PFOA)Detected in 1 system of 6 tested4.0 ng/L federal MCL (2024) · US EPAHighest5.3 ng/L
- HAMILTON PUBLIC WATER SYSTEM5.3 ng/LSample date: 2024-05-08 to 2024-11-13
- FAIRFIELD CITY PWSNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-14 to 2024-09-26
- MIDDLETOWN CITY PWSNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-26 to 2024-08-20
- MONROE CITY PWSNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-06 to 2023-11-06
- OXFORD CITY PWSNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-06 to 2024-12-05
- TRENTON CITY PWSNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-12-04 to 2024-08-29
Perfluorooctanesulfonic acid (PFOS)Detected in 1 system of 6 tested4.0 ng/L federal MCL (2024) · US EPAHighest4.3 ng/L
- MIDDLETOWN CITY PWS4.3 ng/LSample date: 2024-02-26 to 2024-08-20
- FAIRFIELD CITY PWSNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-14 to 2024-09-26
- HAMILTON PUBLIC WATER SYSTEMNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-05-08 to 2024-11-13
- MONROE CITY PWSNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-06 to 2023-11-06
- OXFORD CITY PWSNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-06 to 2024-12-05
- TRENTON CITY PWSNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-12-04 to 2024-08-29
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)Detected in 1 system of 6 tested10 ng/L federal MCL (2024) · US EPAHighest5.7 ng/L
- FAIRFIELD CITY PWS5.7 ng/LSample date: 2023-03-14 to 2024-09-26
- HAMILTON PUBLIC WATER SYSTEMNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-05-08 to 2024-11-13
- MIDDLETOWN CITY PWSNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-02-26 to 2024-08-20
- MONROE CITY PWSNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-03-06 to 2023-11-06
- OXFORD CITY PWSNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-06-06 to 2024-12-05
- TRENTON CITY PWSNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-12-04 to 2024-08-29
Perfluorohexanesulfonic acid (PFHxS)Detected in 2 systems of 6 tested10 ng/L federal MCL (2024) · US EPAHighest4.1 ng/L
- HAMILTON PUBLIC WATER SYSTEM4.1 ng/LSample date: 2024-05-08 to 2024-11-13
- TRENTON CITY PWS3.1 ng/LSample date: 2023-12-04 to 2024-08-29
- FAIRFIELD CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-14 to 2024-09-26
- MIDDLETOWN CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-26 to 2024-08-20
- MONROE CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-06 to 2023-11-06
- OXFORD CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-06 to 2024-12-05
Lead (90th percentile)Detected in 4 systems of 6 tested15 µg/L federal action level · US EPAHighest2.5 µg/L
- TRENTON CITY PWS2.5 µg/LMonitoring period: 2026–2026 (still open)
- OXFORD CITY PWS2.4 µg/LMonitoring period: 2025–2025
- MIDDLETOWN CITY PWS1.14 µg/LMonitoring period: 2023–2025
- MONROE CITY PWS0.614 µg/LMonitoring period: 2026–2026 (still open)
- FAIRFIELD CITY PWSNot detectedMonitoring period: 2026–2026 (still open)
- HAMILTON PUBLIC WATER SYSTEMNot detectedMonitoring period: 2025–2027 (still open)
Perfluorobutanesulfonic acid (PFBS)Detected in 3 systems of 6 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest12.6 ng/L
- OXFORD CITY PWS12.6 ng/LSample date: 2024-06-06 to 2024-12-05
- HAMILTON PUBLIC WATER SYSTEM3.6 ng/LSample date: 2024-05-08 to 2024-11-13
- TRENTON CITY PWS3 ng/LSample date: 2023-12-04 to 2024-08-29
- FAIRFIELD CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-14 to 2024-09-26
- MIDDLETOWN CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-26 to 2024-08-20
- MONROE CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-06 to 2023-11-06
Perfluorohexanoic acid (PFHxA)Detected in 1 system of 6 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest3 ng/L
- FAIRFIELD CITY PWS3 ng/LSample date: 2023-03-14 to 2024-09-26
- HAMILTON PUBLIC WATER SYSTEMNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-08 to 2024-11-13
- MIDDLETOWN CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-26 to 2024-08-20
- MONROE CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-06 to 2023-11-06
- OXFORD CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-06 to 2024-12-05
- TRENTON CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-12-04 to 2024-08-29
Perfluorobutanoic acid (PFBA)Detected in 1 system of 6 testedNo federal or state limit; shown for transparencyHighest5.7 ng/L
- FAIRFIELD CITY PWS5.7 ng/LSample date: 2023-03-14 to 2024-09-26
- HAMILTON PUBLIC WATER SYSTEMNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-05-08 to 2024-11-13
- MIDDLETOWN CITY PWSNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-02-26 to 2024-08-20
- MONROE CITY PWSNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-03-06 to 2023-11-06
- OXFORD CITY PWSNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-06-06 to 2024-12-05
- TRENTON CITY PWSNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-12-04 to 2024-08-29
1 more contaminant detectedShow
Perfluoropentanoic acid (PFPeA)Detected in 1 system of 6 testedNo federal or state limit; shown for transparencyHighest4.3 ng/L
- FAIRFIELD CITY PWS4.3 ng/LSample date: 2023-03-14 to 2024-09-26
- HAMILTON PUBLIC WATER SYSTEMNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-08 to 2024-11-13
- MIDDLETOWN CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-26 to 2024-08-20
- MONROE CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-06 to 2023-11-06
- OXFORD CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-06 to 2024-12-05
- TRENTON CITY PWSNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-12-04 to 2024-08-29
22 substances tested, none detected in any systemShow
Tested in these 6 systems: FAIRFIELD CITY PWS, HAMILTON PUBLIC WATER SYSTEM, MIDDLETOWN CITY PWS, MONROE CITY PWS, OXFORD CITY PWS, TRENTON CITY PWS
- 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)
- Lithium
- 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)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorononanoic acid (PFNA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
- Open city report →
- Open city report →
- Open city report →
- Open city report →
- Open city report →
- Open city report →
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 6 cities above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in OhioLargest water systems
- HamiltonHAMILTON PUBLIC WATER SYSTEM · OH090401262,447 served
- MiddletownMIDDLETOWN CITY PWS · OH090171251,229 served
- FairfieldFAIRFIELD CITY PWS · OH090071544,907 served
- OxfordOXFORD CITY PWS · OH090231224,000 served
- MonroeMONROE CITY PWS · OH090201215,600 served
- TrentonTRENTON CITY PWS · OH090301213,012 served
Frequently asked
How does Butler County tap water compare across cities?
PurityMap ranks 6 cities in Butler County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Monroe's main water system: MONROE CITY PWS · PWSID OH0902012 · Purity Score 99 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Butler County cities had a PFAS sample above a 2024 EPA limit?
2 of 6 Butler County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Hamilton (PFOA 5.3 ng/L), Middletown (PFOS 4.3 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 5.
Is there lead in Butler County tap water?
Utilities report lead as a 90th-percentile result from home taps. 4 of 6 Butler County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
Follow Butler County's water
Get an email when a city record in the county changes. Or go straight to the filters certified for what was found here.
Record changes only
We email when places in Butler County get new results. Unsubscribe any time.
Follow Butler County's water →