Non-Transient Non-Community Water System · PWS NY5907701
John Jay Middle School
Operator location Katonah, New York - smaller served population (≤ 999) at 945 people served; 188 SDWIS violations on record from groundwater sources.
- 945
- People served (this PWS) Smaller third of systems
- 188
- EPA violations (this PWS) Upper third of systems
- 4
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
John Jay Middle School standing, high SDWIS violation third
945 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 2% is middle-third health share (≤ 23%). Population rank #20,502 of 29,740 among systems serving 500+.
The verdict
John Jay Middle School sits in the upper third of the sitemap cohort by violation count (188), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (945; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 2% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #20,502 of 29,740
- Population · /systems
- #789 of 1,204
- Population · NY
- 188
- Total EPA violations on record
- 2%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 1
- County
- Westchester
- School/Daycare
- Yes
- MCL Violations
- 0
- Monitoring Violations
- 130
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 10 | 2017 |
| Groundwater Rule | TT | 4 | 2025 |
| Barium | MR | 3 | 2011 |
| Cadmium | MR | 3 | 2011 |
| Chromium | MR | 3 | 2011 |
| CYANIDE | MR | 3 | 2011 |
| Fluoride | MR | 3 | 2011 |
| Mercury | MR | 3 | 2011 |
| Nickel | MR | 3 | 2011 |
| Antimony, Total | MR | 3 | 2011 |
| Beryllium, Total | MR | 3 | 2011 |
| BHC-GAMMA | MR | 3 | 2019 |
| Toxaphene | MR | 3 | 2019 |
| Dalapon | MR | 3 | 2019 |
| Simazine | MR | 3 | 2019 |
| Picloram | MR | 3 | 2019 |
| Hexachlorocyclopentadiene | MR | 3 | 2019 |
| Aldicarb sulfone | MR | 3 | 2019 |
| Atrazine | MR | 3 | 2019 |
| LASSO | MR | 3 | 2019 |
| Heptachlor epoxide | MR | 3 | 2019 |
| 2,4,5-TP | MR | 3 | 2019 |
| ETHYLENE DIBROMIDE | MR | 3 | 2019 |
| Carbofuran | MR | 3 | 2019 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2019 |
| Pentachlorophenol | MR | 3 | 2019 |
| Aldicarb sulfoxide | MR | 3 | 2019 |
| OXAMYL | MR | 3 | 2019 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2019 |
| Chlordane | MR | 3 | 2019 |
Violation Count vs. the National Corpus
John Jay Middle School has 188 recorded EPA violations, 84% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 16% carry more. 2% of this system's own violations are health-based (4 of 188), and it ranks #20,502 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
188 Higher than most more violations than 84% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
How many violations vs. how serious, among peer systems
John Jay Middle School plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
Population served record for John Jay Middle School
EPA SDWIS lists 945 people served and 1 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · New York State Department of Health, Public Water Systems
Nationwide peers
188 violations · 945 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with John Jay Middle School
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in New York compares on the same EPA violation measures. New York systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.