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States → New York

WESTCHESTER JOINT WATER WORKS

PWS ID: NY5903435 · MAMARONECK, New York 10543

Population Served
59,629
Total Violations
66
Health-Based Violations
30
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
12,000
County
Westchester
School/Daycare
No
MCL Violations
18
Monitoring Violations
29
Treatment Tech Violations
12

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 24 2009
Total Haloacetic Acids (HAA5) MCL 18 2019
Surface Water Treatment Rule TT 9 1993
Total Haloacetic Acids (HAA5) MR 4 2005
Long Term 2 Enhanced Surface Water Treatment Rule TT 3 2015
Nitrate MR 1 1993

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 182 samples detected PFAS.

Contaminant Date Result MRL Status
PFHxS 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 8/6/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 8/6/2025 <9 µg/L 9 µg/L Not Detected
PFTA 8/6/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 8/6/2025 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/6/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 8/6/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/6/2025 <0.002 µg/L 0.002 µg/L Not Detected
NFDHA 8/6/2025 <0.02 µg/L 0.02 µg/L Not Detected
NMeFOSAA 8/6/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFPeS 8/6/2025 <0.004 µg/L 0.004 µg/L Not Detected
11Cl-PF3OUdS 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/6/2025 <0.004 µg/L 0.004 µg/L Not Detected
4:2 FTS 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/6/2025 <0.002 µg/L 0.002 µg/L Not Detected
8:2 FTS 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 8/6/2025 <0.002 µg/L 0.002 µg/L Not Detected
6:2 FTS 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 8/6/2025 <9 µg/L 9 µg/L Not Detected
11Cl-PF3OUdS 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/6/2025 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/6/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFTA 8/6/2025 <0.008 µg/L 0.008 µg/L Not Detected
4:2 FTS 8/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 8/6/2025 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 8/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.