John Jay Middle School

PWSID: NY5907701

✓

No active violations
This system has no unresolved violations. The most recent violation on record was 2025-07-01.

This system has more violations on record than 91% of water systems in New York.

Violation trend: 5.6 per year over the last 5 years, down from 7.8 per year in the previous 5.

System Details

Population Served	945
Service Connections	1
Water Source	Groundwater
System Type	Non-Transient Non-Community
Owner	Local Government
Status	Active
City	Katonah
EPA ZIP on File	10536
Note	School or Daycare

Areas Served

Westchester County

Lead & Copper Testing

Contaminant	Level	EPA Action Level	Status
Lead (90th percentile)	0.0070 mg/L	0.015 mg/L	Below Action Level
Lead (90th percentile)	0.0014 mg/L	0.015 mg/L	Below Action Level
Lead (90th percentile)	0.0010 mg/L	0.015 mg/L	Below Action Level
Lead (90th percentile)	0.0010 mg/L	0.015 mg/L	Below Action Level

Violation History (70 total)

Contaminant	Violation	Date	Health-Based	Status
2806	MCL Measured: 13.20 NG/L (limit: 10.00 NG/L)	2025-07-01	Yes	Acknowledged
0700	TT	2025-05-01	Yes	Acknowledged
0700	TT	2025-05-01	Yes	Returned to Compliance
2806	MCL Measured: 14.10 NG/L (limit: 10.00 NG/L)	2025-04-01	Yes	Acknowledged
2806	MCL Measured: 14.10 NG/L (limit: 10.00 NG/L)	2025-04-01	Yes	Acknowledged
2806	MCL Measured: 11.60 NG/L (limit: 10.00 NG/L)	2025-01-01	Yes	Acknowledged
2806	MCL Measured: 11.60 NG/L (limit: 10.00 NG/L)	2025-01-01	Yes	Acknowledged
2806	MCL Measured: 11.60 NG/L (limit: 10.00 NG/L)	2025-01-01	Yes	Acknowledged
2806	MCL Measured: 13.70 NG/L (limit: 10.00 NG/L)	2024-10-01	Yes	Acknowledged
2806	MCL Measured: 10.50 NG/L (limit: 10.00 NG/L)	2024-07-01	Yes	Acknowledged
2806	MCL Measured: 10.50 NG/L (limit: 10.00 NG/L)	2024-07-01	Yes	Acknowledged
2806	MCL Measured: 13.70 NG/L (limit: 10.00 NG/L)	2024-04-01	Yes	Acknowledged
2806	MCL Measured: 13.70 NG/L (limit: 10.00 NG/L)	2024-04-01	Yes	Acknowledged
2806	MCL Measured: 14.40 NG/L (limit: 10.00 NG/L)	2024-01-01	Yes	Acknowledged
2806	MCL Measured: 17.90 NG/L (limit: 10.00 NG/L)	2023-10-01	Yes	Acknowledged
2805	MCL Measured: 10.20 NG/L (limit: 10.00 NG/L)	2023-10-01	Yes	Acknowledged
2806	MCL Measured: 11.40 NG/L (limit: 10.00 NG/L)	2023-07-01	Yes	Acknowledged
2806	MCL Measured: 13.80 NG/L (limit: 10.00 NG/L)	2023-04-01	Yes	Acknowledged
1017	MCL Measured: 266.50 MG/L (limit: 250.00 MG/L)	2023-01-01	Yes	Acknowledged
1017	MCL Measured: 266.50 MG/L (limit: 250.00 MG/L)	2023-01-01	Yes	Acknowledged
1017	MCL Measured: 266.50 MG/L (limit: 250.00 MG/L)	2023-01-01	Yes	Acknowledged
2806	MCL Measured: 14.10 NG/L (limit: 10.00 NG/L)	2023-01-01	Yes	Acknowledged
2806	MCL Measured: 13.80 NG/L (limit: 10.00 NG/L)	2022-10-01	Yes	Acknowledged
2806	MCL Measured: 15.00 NG/L (limit: 10.00 NG/L)	2022-07-01	Yes	Acknowledged
2805	MCL Measured: 10.60 NG/L (limit: 10.00 NG/L)	2022-07-01	Yes	Acknowledged
2806	MCL Measured: 15.20 NG/L (limit: 10.00 NG/L)	2022-04-01	Yes	Acknowledged
2806	MCL Measured: 11.30 NG/L (limit: 10.00 NG/L)	2022-01-01	Yes	Acknowledged
2805	MCL Measured: 20.10 NG/L (limit: 10.00 NG/L)	2022-01-01	Yes	Acknowledged
2005	MR	2019-01-01	Major	Returned to Compliance
2010	MR	2019-01-01	Major	Returned to Compliance
2015	MR	2019-01-01	Major	Returned to Compliance
2020	MR	2019-01-01	Major	Returned to Compliance
2021	MR	2019-01-01	Major	Returned to Compliance
2022	MR	2019-01-01	Major	Returned to Compliance
2031	MR	2019-01-01	Major	Returned to Compliance
2035	MR	2019-01-01	Major	Returned to Compliance
2036	MR	2019-01-01	Major	Returned to Compliance
2037	MR	2019-01-01	Major	Returned to Compliance
2039	MR	2019-01-01	Major	Returned to Compliance
2040	MR	2019-01-01	Major	Returned to Compliance
2041	MR	2019-01-01	Major	Returned to Compliance
2042	MR	2019-01-01	Major	Returned to Compliance
2043	MR	2019-01-01	Major	Returned to Compliance
2044	MR	2019-01-01	Major	Returned to Compliance
2045	MR	2019-01-01	Major	Returned to Compliance
2046	MR	2019-01-01	Major	Returned to Compliance
2047	MR	2019-01-01	Major	Returned to Compliance
2050	MR	2019-01-01	Major	Returned to Compliance
2051	MR	2019-01-01	Major	Returned to Compliance
2065	MR	2019-01-01	Major	Returned to Compliance

Showing 50 of 70 historical violations.

Understanding This Water System's Record

John Jay Middle School is a non-transient non-community water system that draws from groundwater sources and serves a population of 945 in Katonah, New York. This page shows its complete compliance history as reported to the EPA's Safe Drinking Water Information System (SDWIS), the federal database that tracks every public water system in the United States.

What Do These Violations Mean?

Health-based violations mean the system exceeded an EPA maximum contaminant level (MCL) or failed to provide required treatment. These indicate potential health risks from contaminants like lead, arsenic, bacteria, nitrates, or disinfection byproducts. Non-health-based violations involve monitoring, reporting, or procedural requirements — the system missed a testing deadline or failed to notify customers, but contaminant levels were not necessarily unsafe.

What Should You Do?

Your water utility is required to publish an annual Consumer Confidence Report (CCR) that details test results and any violations. If your system has active health-based violations, consider a certified water filter rated for the specific contaminants involved. The contaminant guides on this site explain health risks and filter options for common pollutants. For the most current results, contact your water utility directly — EPA data can lag weeks or months behind real-time testing.