Updated 2026-09-16

County water report

Lycoming County Water Quality

Name: Lycoming County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Lycoming County, Pennsylvania: one city report built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map

Across the county's systems

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.

Perfluorooctanesulfonic acid (PFOS)WILLIAMSPORT MUN WATER AUTH4.0 ng/L federal MCL (2024) · US EPA5.1 ng/L

WILLIAMSPORT MUN WATER AUTH5.1 ng/LSample date: 2024-03-05 to 2024-12-10

Perfluorononanoic acid (PFNA)WILLIAMSPORT MUN WATER AUTH10 ng/L federal MCL (2024) · US EPA9.7 ng/L

WILLIAMSPORT MUN WATER AUTH9.7 ng/LSample date: 2024-03-05 to 2024-12-10

Perfluorohexanesulfonic acid (PFHxS)WILLIAMSPORT MUN WATER AUTH10 ng/L federal MCL (2024) · US EPA3.6 ng/L

WILLIAMSPORT MUN WATER AUTH3.6 ng/LSample date: 2024-03-05 to 2024-12-10

Lead (90th percentile)WILLIAMSPORT MUN WATER AUTH15 µg/L federal action level · US EPA2 µg/L

WILLIAMSPORT MUN WATER AUTH2 µg/LMonitoring period: 2025–2025

Perfluorohexanoic acid (PFHxA)WILLIAMSPORT MUN WATER AUTH400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLE3.5 ng/L

WILLIAMSPORT MUN WATER AUTH3.5 ng/LSample date: 2024-03-05 to 2024-12-10

Perfluoropentanoic acid (PFPeA)WILLIAMSPORT MUN WATER AUTHNo federal or state limit; shown for transparency4.1 ng/L

WILLIAMSPORT MUN WATER AUTH4.1 ng/LSample date: 2024-03-05 to 2024-12-10

25 substances tested, none detected in this systemShow

Tested in this system: WILLIAMSPORT MUN WATER AUTH

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)
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)
Perfluorobutanesulfonic acid (PFBS)
Perfluorobutanoic acid (PFBA)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

1 city

Cities ranked by the records

1
WilliamsportWILLIAMSPORT MUN WATER AUTH
PFAS above limitLead below action level
Open city report →

Showing 1 of 1 cities · scores are system-level, not tap tests

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.

PFAS in Lycoming County1 of 1 city reports a regulated PFAS above the federal limit

Williamsport5.1 ng/L

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Pennsylvania

Lead

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 Pennsylvania

Who supplies the county

Largest water systems

WilliamsportWILLIAMSPORT MUN WATER AUTH · PA4410173
51,000 served

Questions

Frequently asked

How does Lycoming County tap water compare across cities?

PurityMap ranks 1 city in Lycoming 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 Williamsport's main water system: WILLIAMSPORT MUN WATER AUTH · PWSID PA4410173 · Purity Score 70 (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 Lycoming County cities have PFAS above the federal limit?

1 city of 1 had at least one regulated PFAS (PFOA, PFOS or PFHxS) measured above the 2024 federal limit in EPA's UCMR 5 testing, including Williamsport (PFOS 5.1 ng/L). PFAS were detected at any level in 1.

Is there lead in Lycoming County tap water?

Utilities report lead as a 90th-percentile result from home taps. 1 of 1 Lycoming 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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