Community Water System · PWS NY2902831
Jericho WD
Operator location Syosset, New York - UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)) on this PWS; SDWIS lists 373 violations and 58,000 people served.
- 58,000
- People served (this PWS)
- 373
- EPA violations (this PWS)
- 9
- Health-based (this PWS)
- 5 PFAS
- UCMR5 (this PWS)
Jericho WD standing, high SDWIS violation third
UCMR5 detected 5 PFAS compounds - upper-third PFAS panel (> 4 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 2% is middle-third health share (≤ 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #919 of 29,740 among systems serving 500+.
The verdict
Jericho WD sits in the upper third of the sitemap cohort by violation count (373), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (58,000; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 2% (middle-third health share (≤ 23%)). UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #919 of 29,740
- Population · /systems
- #26 of 1,204
- Population · NY
- 373
- 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.
5 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Public/Private
- Connections
- 18,466
- County
- Nassau
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 364
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Atrazine | MR | 16 | 2013 |
| Simazine | MR | 16 | 2013 |
| Nitrate | MR | 12 | 2010 |
| BHC-GAMMA | MR | 12 | 2013 |
| Methoxychlor | MR | 12 | 2013 |
| Toxaphene | MR | 12 | 2013 |
| Dalapon | MR | 12 | 2013 |
| Di(2-ethylhexyl) adipate | MR | 12 | 2013 |
| Picloram | MR | 12 | 2013 |
| Dinoseb | MR | 12 | 2013 |
| Hexachlorocyclopentadiene | MR | 12 | 2013 |
| Aldicarb sulfoxide | MR | 12 | 2013 |
| Aldicarb sulfone | MR | 12 | 2013 |
| Carbofuran | MR | 12 | 2013 |
| Aldicarb | MR | 12 | 2013 |
| Heptachlor epoxide | MR | 12 | 2013 |
| 2,4-D | MR | 12 | 2013 |
| 2,4,5-TP | MR | 12 | 2013 |
| HEXACHLOROBENZENE | MR | 12 | 2013 |
| Benzo(a)pyrene | MR | 12 | 2013 |
| Total Polychlorinated Biphenyls (PCB) | MR | 12 | 2013 |
| ETHYLENE DIBROMIDE | MR | 12 | 2013 |
| Chlordane | MR | 12 | 2013 |
| Di(2-ethylhexyl) phthalate | MR | 12 | 2013 |
| Endrin | MR | 12 | 2013 |
| LASSO | MR | 12 | 2013 |
| Pentachlorophenol | MR | 12 | 2013 |
| Heptachlor | MR | 12 | 2013 |
| OXAMYL | MR | 12 | 2013 |
| Coliform (TCR) | MCL | 9 | 1999 |
Violation Count vs. the National Corpus
Jericho WD has 373 recorded EPA violations, 93% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 7% carry more. 2% of this system's own violations are health-based (9 of 373), and it ranks #919 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)
373 Higher than most more violations than 93% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 28 of 935 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFHpA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 9/1/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHpS | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 9/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 9/1/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 9/1/2023 | 5.30 ppt | 3.00 ppt | Detected |
| PFMPA | 9/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 9/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 4:2 FTS | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 9/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 9/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 9/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/1/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 9/1/2023 | 3.40 ppt | 3.00 ppt | Detected |
| PFDA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 9/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 9/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 9/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDoA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 9/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 9/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 9/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 9/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 9/1/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFUnA | 9/1/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/1/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 9/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 9/1/2023 | 7.60 ppt | 5.00 ppt | Detected |
| 6:2 FTS | 9/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 9/1/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 9/1/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 9/1/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
UCMR5 PFAS record for Jericho WD
Open EPA SDWIS federal reports for PWS NY2902831 to cross-check UCMR5 detections and violation codes; state primacy agencies enforce the Safe Drinking Water Act locally.
Sources: EPA SDWIS · New York State Department of Health, Public Water Systems
Nationwide peers
373 violations · 58,000 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 similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Jericho WD
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.