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Non-Transient Non-Community Water System · PWS NY5907710

Byram Hills High School

Armonk, New York 10504 - drinking water served from groundwater sources to 800 people, tracked in EPA SDWIS and UCMR5.

800
People served
436
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 436 drinking-water violations at Byram Hills High School - above the New York per-system average.

436
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
800
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Byram Hills High School

Byram Hills High School is a local-owned non-transient non-community water system that delivers drinking water to 800 residents in Armonk, New York (Westchester County) through 2 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 436 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 429 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 21 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across New York, EPA tracks 8,098 public water systems serving 19,294,951 people, with 552,003 cumulative violations and 26,817 health-based violations on record. About 94% of systems in the state carry at least one violation, and state-wide the average per system is 68.2 violations. Statewide, 129 of 332 UCMR5-tested systems have reported PFAS detections (38.9%).

Byram Hills High School's 436 violations sit above the New York average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
800
Total Violations
436
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
2
County
Westchester
School/Daycare
Yes
MCL Violations
0
Monitoring Violations
429
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 21 2009
Endrin MR 10 2003
Chlordane MR 10 2003
Pentachlorophenol MR 10 2003
HEXACHLOROBENZENE MR 10 2003
2,4,5-TP MR 10 2003
2,4-D MR 10 2003
Heptachlor epoxide MR 10 2003
Heptachlor MR 10 2003
LASSO MR 10 2003
Atrazine MR 10 2003
Carbofuran MR 10 2003
Aldicarb sulfoxide MR 10 2003
Hexachlorocyclopentadiene MR 10 2003
Picloram MR 10 2003
Di(2-ethylhexyl) phthalate MR 10 2003
Simazine MR 10 2003
OXAMYL MR 10 2003
Di(2-ethylhexyl) adipate MR 10 2003
Toxaphene MR 10 2003
Dalapon MR 10 2003
Aldicarb sulfone MR 10 2003
Aldicarb MR 10 2003
Benzo(a)pyrene MR 10 2003
ETHYLENE DIBROMIDE MR 10 2003
BHC-GAMMA MR 10 2003
Total Polychlorinated Biphenyls (PCB) MR 10 2003
Dinoseb MR 10 2003
Methoxychlor MR 10 2003
Coliform (TCR) MR 8 2016

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Byram Hills High School.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID NY5907710 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

New York Drinking Water Authority

New York State Department of Health, Public Water Systems is the primacy agency that licenses and inspects Byram Hills High School under EPA-delegated authority.

Open NY regulator portal

Source: New York State Department of Health, Public Water Systems

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2021 Total Haloacetic Acids (HAA5) MR 4 SDWIS / NY5907710 / 2456
2021 TTHM MR 4 SDWIS / NY5907710 / 2950
2016 Coliform (TCR) MR 8 SDWIS / NY5907710 / 3100
2010 Arsenic MR 6 SDWIS / NY5907710 / 1005
2010 Cadmium MR 6 SDWIS / NY5907710 / 1015
2010 CYANIDE MR 6 SDWIS / NY5907710 / 1024
2010 Beryllium, Total MR 6 SDWIS / NY5907710 / 1075
2010 Selenium MR 6 SDWIS / NY5907710 / 1045
2010 Barium MR 6 SDWIS / NY5907710 / 1010
2010 Chromium MR 6 SDWIS / NY5907710 / 1020
2010 Nickel MR 6 SDWIS / NY5907710 / 1036
2010 Antimony, Total MR 6 SDWIS / NY5907710 / 1074
2010 Thallium, Total MR 6 SDWIS / NY5907710 / 1085
2010 Fluoride MR 6 SDWIS / NY5907710 / 1025
2010 Mercury MR 6 SDWIS / NY5907710 / 1035

How Byram Hills High School Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Byram Hills High School New York avg Federal benchmark
Total violations 436 68.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 3.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 38.9% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 800 2,383 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 8,098 regulated public water systems in New York.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Byram Hills High School water safe to drink? ▼
Byram Hills High School (PWS ID: NY5907710) has 436 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 800 people using Groundwater sources.
How many people does Byram Hills High School serve? ▼
Byram Hills High School serves 800 people in Armonk, New York. It is a Local-owned system using Groundwater water sources with 2 service connections.
What type of violations does Byram Hills High School have? ▼
Byram Hills High School has 436 total violations: 0 health-based violations (MCL exceedances or treatment failures), 429 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Byram Hills High School water? ▼
No PFAS testing data is available for Byram Hills High School under the EPA's UCMR5 monitoring program.
What water source does Byram Hills High School use? ▼
Byram Hills High School uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.