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Public water system record

Westchester Joint Water Works

Serves Harrison, Mamaroneck and Rye, Westchester County, NY · 59,629 people served

Federal records show 4 health-based violations and no monitoring/reporting issues for Westchester Joint Water Works in the last ten years, including an unresolved Surface Water Treatment Rule violation.

  • NY5903435
  • MAMARONECK
  • NY
  • 59,629 served

System profile

Source water Surface water
ZIP 10543
EPA system ID NY5903435

Verify this system on EPA ECHO →

Health-based violations, last 10 years
4
Resolved
3
Unresolved
1
Any acute record
No
Monitoring issues, last 10 years
0

Key facts

  • Westchester Joint Water Works draws water from 1 surface water intake.
  • Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 0.068 mg/L, federal limit 0.06 mg/L (1.1 times the limit), 2019.
  • Most recent formal enforcement: compliance order (no penalty) by EPA, November 2019.
  • Record on file since 1993, with 2 health-based violations before October 19, 2016.
  • Lead pipe inventory: 635 lead and 9,379 unknown out of 15,001 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 220 Jul 1, 2019 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 220 Apr 1, 2019 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.068 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Jan 1, 2019 Resolved No
Surface Water Treatment Rule
Treatment technique failure
 120 Jun 30, 1993 Active
Enforcement action in place
 No

Full record since 1993

EPA's records for Westchester Joint Water Works go back to 1993. Before October 19, 2016 they list 2 health-based violations (1 resolved, 1 not resolved) and 8 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 1 1
2000s 0 7
2010 to October 18, 2016 1 0
October 19, 2016 to 2019 3 0

Most recent health-based violation before October 19, 2016: Long Term 2 Enhanced Surface Water Treatment Rule, began May 2015, Resolved.

Show all 2 health-based violations before October 19, 2016
Contaminant Start date Status
Long Term 2 Enhanced Surface Water Treatment Rule
Treatment technique failure
 May 1, 2015 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Jun 30, 1993 Active

Enforcement actions

New York regulators and EPA took 5 formal enforcement actions against Westchester Joint Water Works between 1999 and 2019, filed as 8 records in EPA's data. The most recent was a compliance order (no penalty) in November 2019.

Date By Action Violations covered
Nov 26, 2019 EPA Compliance order (no penalty) 4 violations (4 health-based): Surface Water Treatment Rule, Haloacetic Acids (HAA5)
Mar 28, 2019 EPA Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Jan 7, 2002 New York Civil case filed in court 2 violations (2 health-based): Surface Water Treatment Rule
Sep 15, 1999 New York Civil case filed in court 2 violations (2 health-based): Surface Water Treatment Rule
Sep 3, 1999 New York Civil case filed in court 2 violations (2 health-based): Surface Water Treatment Rule

What the violations mean

Haloacetic Acids (HAA5)

3 incidents

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Surface Water Treatment Rule

1 incident

The system did not complete a treatment step or action that the Surface Water Treatment Rule requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Westchester Joint Water Works draws water from 1 surface water intake. It also buys water from New York City System. 2 other community water systems and 1 smaller public system such as schools, businesses or campgrounds buy water from Westchester Joint Water Works. 1 other public water system has an emergency connection to Westchester Joint Water Works.

Buys water from

Community systems that buy water from it

Annual water quality report

Westchester Joint Water Works must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by New York.

Certified drinking water labs by state EPA guidance for private wells