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WESTCHESTER JOINT WATER WORKS

New York — Community Water System — PWSID: NY5903435

System Information

PWSIDNY5903435
System NameWESTCHESTER JOINT WATER WORKS
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region02
Serves SchoolNo
WholesalerNo
First ReportedJan 29, 1981
Last ReportedDec 23, 2025

Location & Contact

StateNew York
CityMAMARONECK
ZIP Code10543
AddressVillage of Mamaroneck
OrganizationMURPHY, THOMAS A
Phone914-777-7722

Population & Service

Population Served59,629
Service Connections12,000

Drinking Water Violations (49)

This water system has 49 violations recorded in the EPA SDWIS database.

Begin Date End Date Contaminant Category Health-Based Major Measured Federal MCL State MCL Status Return to Compliance Rule
Jul 1, 2019 Sep 30, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Sep 12, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2019 Sep 30, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Sep 12, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2019 Sep 30, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Sep 12, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2019 Sep 30, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Sep 12, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2019 Sep 30, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Sep 12, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2019 Jun 30, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Jun 27, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2019 Jun 30, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Jun 27, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2019 Jun 30, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Jun 27, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2019 Jun 30, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Jun 27, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2019 Jun 30, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Jun 27, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2019 Jun 30, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Jun 27, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Mar 31, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .068 MG/L 0.060 mg/L .06 Resolved Mar 29, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Mar 31, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .068 MG/L 0.060 mg/L .06 Resolved Mar 29, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Mar 31, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .068 MG/L 0.060 mg/L .06 Resolved Mar 29, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Mar 31, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .068 MG/L 0.060 mg/L .06 Resolved Mar 29, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Mar 31, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .068 MG/L 0.060 mg/L .06 Resolved Mar 29, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Mar 31, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .068 MG/L 0.060 mg/L .06 Resolved Mar 29, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Mar 31, 2019 Total Haloacetic Acids (HAA5) MCL Yes No .068 MG/L 0.060 mg/L .06 Resolved Mar 29, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
May 1, 2015 — Long Term 2 Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jul 21, 2016 Long Term 2 Enhanced Surface Water Treatment Rule
May 1, 2015 — Long Term 2 Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jul 21, 2016 Long Term 2 Enhanced Surface Water Treatment Rule
May 1, 2015 — Long Term 2 Enhanced Surface Water Treatment Rule TT Yes No — — — Resolved Jul 21, 2016 Long Term 2 Enhanced Surface Water Treatment Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 — Lead and Copper Rule MR No No — TT — Resolved Jul 27, 2010 Lead and Copper Rule
Jan 1, 2009 — Lead and Copper Rule MR No No — TT — Resolved Jul 27, 2010 Lead and Copper Rule
Jan 1, 2009 — Lead and Copper Rule MR No No — TT — Resolved Jul 27, 2010 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jan 1, 2009 Jun 30, 2009 Lead and Copper Rule MR No No — TT — Resolved Jun 30, 2009 Lead and Copper Rule
Jun 30, 1993 — Surface Water Treatment Rule TT Yes No — — — Addressed — Surface Water Treatment Rule
Jun 30, 1993 — Surface Water Treatment Rule TT Yes No — — — Addressed — Surface Water Treatment Rule
Jun 30, 1993 — Surface Water Treatment Rule TT Yes No — — — Addressed — Surface Water Treatment Rule
Jun 30, 1993 — Surface Water Treatment Rule TT Yes No — — — Addressed — Surface Water Treatment Rule
Jun 30, 1993 — Surface Water Treatment Rule TT Yes No — — — Addressed — Surface Water Treatment Rule
Jun 30, 1993 — Surface Water Treatment Rule TT Yes No — — — Addressed — Surface Water Treatment Rule
Jun 30, 1993 — Surface Water Treatment Rule TT Yes No — — — Addressed — Surface Water Treatment Rule
Jun 30, 1993 — Surface Water Treatment Rule TT Yes No — — — Addressed — Surface Water Treatment Rule
Jun 30, 1993 — Surface Water Treatment Rule TT Yes No — — — Addressed — Surface Water Treatment Rule

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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