Non-Transient Non-Community Water System · PWS NY5907700
John Jay Senior High School
Operator location Katonah, New York - upper-third violation load (> 74 violations) with 154 EPA violations; groundwater source; 1,425 served (PWS-level, not municipal population).
- 1,425
- People served (this PWS)
- 154
- EPA violations (this PWS)
- 8
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
John Jay Senior High School standing, high SDWIS violation third
154 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 5% is middle-third health share (≤ 23%). Population rank #16,412 of 29,740 among systems serving 500+.
The verdict
John Jay Senior High School sits in the upper third of the sitemap cohort by violation count (154), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,425 (mid served population (≤ 3,309)). Health-based share is 5% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #16,412 of 29,740
- Population · /systems
- #607 of 1,204
- Population · NY
- 154
- Total EPA violations on record
- 5%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 11
- County
- Westchester
- School/Daycare
- Yes
- MCL Violations
- 8
- Monitoring Violations
- 140
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 14 | 2010 |
| Coliform (TCR) | MCL | 8 | 2003 |
| Coliform (TCR) | MR | 6 | 2008 |
| BHC-GAMMA | MR | 4 | 2017 |
| Methoxychlor | MR | 4 | 2017 |
| Toxaphene | MR | 4 | 2017 |
| Dalapon | MR | 4 | 2017 |
| Di(2-ethylhexyl) adipate | MR | 4 | 2017 |
| Aldicarb sulfoxide | MR | 4 | 2017 |
| Aldicarb sulfone | MR | 4 | 2017 |
| Aldicarb | MR | 4 | 2017 |
| 2,4-D | MR | 4 | 2017 |
| 2,4,5-TP | MR | 4 | 2017 |
| HEXACHLOROBENZENE | MR | 4 | 2017 |
| Pentachlorophenol | MR | 4 | 2017 |
| Total Polychlorinated Biphenyls (PCB) | MR | 4 | 2017 |
| Chlordane | MR | 4 | 2017 |
| Revised Total Coliform Rule | MON | 4 | 2024 |
| Nitrate | MR | 4 | 2023 |
| ETHYLENE DIBROMIDE | MR | 4 | 2017 |
| Hexachlorocyclopentadiene | MR | 4 | 2017 |
| OXAMYL | MR | 4 | 2017 |
| Benzo(a)pyrene | MR | 4 | 2017 |
| LASSO | MR | 4 | 2017 |
| Carbofuran | MR | 4 | 2017 |
| Atrazine | MR | 4 | 2017 |
| Picloram | MR | 4 | 2017 |
| Heptachlor | MR | 4 | 2017 |
| Dinoseb | MR | 4 | 2017 |
| Public Notice | Other | 4 | 2020 |
Violation Count vs. the National Corpus
John Jay Senior High School has 154 recorded EPA violations, 81% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 18% carry more. 5% of this system's own violations are health-based (8 of 154), and it ranks #16,412 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)
154 Higher than most more violations than 81% 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
SDWIS compliance record for John Jay Senior High School
154 violations on record for NY5907700; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · New York State Department of Health, Public Water Systems
Nationwide peers
154 violations · 1,425 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with John Jay Senior High 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.