CheckPFAS

ZIP Code 10549

High Risk
High Risk PFAS Risk Level

PFAS above EPA limits detected

3 compounds exceed EPA Maximum Contaminant Levels in water serving this ZIP code. Standard pitcher filters like Brita do not remove PFAS. See filter recommendations below.

12
PFAS Detected
3
Above EPA Limits
2
Water Systems
2650%
Highest % of MCL

Compounds Exceeding EPA Limits

PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 2650% of limit
Detected: 106.00 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 695% of limit
Detected: 27.80 ppt
PFHxS Exceeds EPA limit
0 ppt MCL: 10 ppt 516% of limit
Detected: 51.60 ppt

What this means for you

One or more PFAS compounds were measured above the EPA's enforceable drinking water limit at a utility serving ZIP 10549. The EPA set these limits because long-term exposure at higher concentrations is associated with health effects including immune suppression, thyroid changes, and cancer risk increases. Standard pitcher filters (Brita, PUR) are not certified to remove PFAS. The most reliable at-home options are under-sink reverse osmosis systems or activated carbon block filters with an NSF/ANSI 58 certification specifically listing PFOA/PFOS reduction. Your water utility is required to bring levels into compliance by 2029 — filtering at the tap is the practical interim step if you'd like additional protection now.

YESHIVA FARM SETTLEMENT

NY5903150 High Risk
Water Type
GU
PFAS Detected
10
Above MCL
3
State
New York
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFOS
Perfluorooctane sulfonic acid
106.00ppt
2650% of limit
4 ppt⚠ Exceeds MCL
PFOA
Perfluorooctanoic acid
27.80ppt
695% of limit
4 ppt⚠ Exceeds MCL
PFHxS
Perfluorohexane sulfonic acid
51.60ppt
516% of limit
10 ppt⚠ Exceeds MCL
PFNA
Perfluorononanoic acid
5.00ppt
50% of limit
10 pptBelow limit
PFPeA
Perfluoropentanoic acid
106.00pptNo federal limitUnregulated
PFHxA
Perfluorohexanoic acid
69.00pptNo federal limitUnregulated
PFHpA
Perfluoroheptanoic acid
45.50pptNo federal limitUnregulated
PFBA
Perfluorobutanoic acid
30.50pptNo federal limitUnregulated
Show 2 more compounds detected at low levels
PFPeS7.00 pptNo federal limit
PFBSPerfluorobutane sulfonic acid6.10 pptNo federal limit

MOUNT KISCO WATER DEPARTMENT

NY5903437 Low Level
Water Type
Surface Water
PFAS Detected
2
Above MCL
0
State
New York
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
13600.00pptNo federal limitUnregulated
PFPeA
Perfluoropentanoic acid
3.10pptNo federal limitUnregulated
Note: ZIP code 10549 is served by 2 separate water utilities. Results above show data for each system independently.
About this data
Source
EPA UCMR 5 (Unregulated Contaminant Monitoring Rule, 5th cycle)
Data released
January 2026
Sampling period
January 2023 – December 2025
Systems tested
~10,000 public water systems serving > 25 people
Water systems (PWSID)
NY5903150, NY5903437
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor, not zero

Values shown are the highest single-sample concentration measured at entry points to the distribution system. Results reflect water quality at the treatment plant — aging pipes, building plumbing, and on-site storage can affect what actually reaches your tap.