Carroll County Water Quality
Carroll County, Maryland: one city report 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)CITY OF WESTMINSTER4.0 ng/L federal MCL (2024) · US EPA12.4 ng/L
- CITY OF WESTMINSTER12.4 ng/LSample date: 2023-01-31 to 2025-09-04
Perfluorooctanesulfonic acid (PFOS)CITY OF WESTMINSTER4.0 ng/L federal MCL (2024) · US EPA6.9 ng/L
- CITY OF WESTMINSTER6.9 ng/LSample date: 2023-01-31 to 2025-09-04
Perfluorohexanesulfonic acid (PFHxS)CITY OF WESTMINSTER10 ng/L federal MCL (2024) · US EPA4.2 ng/L
- CITY OF WESTMINSTER4.2 ng/LSample date: 2023-01-31 to 2025-09-04
Perfluorobutanesulfonic acid (PFBS)CITY OF WESTMINSTER2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPA8.6 ng/L
- CITY OF WESTMINSTER8.6 ng/LSample date: 2023-01-31 to 2025-09-04
Perfluorohexanoic acid (PFHxA)CITY OF WESTMINSTER400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLE24.6 ng/L
- CITY OF WESTMINSTER24.6 ng/LSample date: 2023-01-31 to 2025-09-04
Perfluorobutanoic acid (PFBA)CITY OF WESTMINSTERNo federal or state limit; shown for transparency20.1 ng/L
- CITY OF WESTMINSTER20.1 ng/LSample date: 2023-01-31 to 2025-09-04
Perfluoroheptanoic acid (PFHpA)CITY OF WESTMINSTERNo federal or state limit; shown for transparency8.1 ng/L
- CITY OF WESTMINSTER8.1 ng/LSample date: 2023-01-31 to 2025-09-04
Perfluoropentanoic acid (PFPeA)CITY OF WESTMINSTERNo federal or state limit; shown for transparency66.7 ng/L
- CITY OF WESTMINSTER66.7 ng/LSample date: 2023-01-31 to 2025-09-04
23 substances tested, none detected in this systemShow
Tested in this system: CITY OF WESTMINSTER
- 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)
- Lead (90th percentile)
- 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)
- Perfluorononanoic acid (PFNA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
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 1 city 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 MarylandLargest water systems
- WestminsterCITY OF WESTMINSTER · MD006001535,256 served
Frequently asked
How does Carroll County tap water compare across cities?
PurityMap ranks 1 city in Carroll 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 Westminster's main water system: CITY OF WESTMINSTER · PWSID MD0060015 · Purity Score 55 (Fair) · 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 Carroll County cities had a PFAS sample above a 2024 EPA limit?
1 of 1 Carroll County city report had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Westminster (PFOA 12.4 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 1.
Is there lead in Carroll County tap water?
Utilities report lead as a 90th-percentile result from home taps. 0 of 1 Carroll 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.
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