Community Water System · PWS NY5103271
Greenlawn Water District
Operator location Greenlawn, New York - larger served population (> 3,309) at 42,000 people served; 87 SDWIS violations on record from groundwater sources.
- 42,000
- People served (this PWS)
- 87
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- 3 PFAS
- UCMR5 (this PWS)
Greenlawn Water District standing, high SDWIS violation third
42,000 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 5% is middle-third health share (≤ 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #1,312 of 29,740 among systems serving 500+.
The verdict
Greenlawn Water District sits in the upper third of the sitemap cohort by violation count (87), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (42,000; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 5% (middle-third health share (≤ 23%)). UCMR5 detected 3 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #1,312 of 29,740
- Population · /systems
- #43 of 1,204
- Population · NY
- 87
- 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.
3 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 11,500
- County
- Suffolk
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 48
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate-Nitrite | MR | 5 | 2025 |
| Coliform (TCR) | MCL | 4 | 2000 |
| E. COLI | MR | 4 | 2010 |
| Coliform (TCR) | MR | 3 | 2011 |
| Nitrate | MR | 3 | 2023 |
| Nitrite | MR | 3 | 2023 |
| Chlorite | MR | 3 | 2023 |
| Bromate | MR | 3 | 2023 |
| Consumer Confidence Rule | Other | 2 | 2012 |
| Cadmium | MR | 2 | 2024 |
| CYANIDE | MR | 2 | 2024 |
| Fluoride | MR | 2 | 2024 |
| Nickel | MR | 2 | 2024 |
| Antimony, Total | MR | 2 | 2024 |
| Thallium, Total | MR | 2 | 2024 |
| Chromium | MR | 2 | 2024 |
| Arsenic | MR | 2 | 2024 |
| Selenium | MR | 2 | 2024 |
| Beryllium, Total | MR | 2 | 2024 |
| Barium | MR | 2 | 2024 |
| Mercury | MR | 2 | 2024 |
Violation Count vs. the National Corpus
Greenlawn Water District has 87 recorded EPA violations, 70% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 30% carry more. 5% of this system's own violations are health-based (4 of 87), and it ranks #1,312 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)
87 Around the middle fewer violations than 30% 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. 4 of 696 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFPeA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 8/14/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 8/14/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 8/14/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| NFDHA | 8/14/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFMBA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeS | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 8/14/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| HFPO-DA | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/14/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 5/23/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 5/23/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 5/23/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 5/23/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 5/23/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 5/23/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFBS | 5/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 5/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 5/23/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 5/23/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 5/23/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 5/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 5/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 5/23/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHpA | 5/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 5/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 5/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 5/23/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 5/23/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 5/23/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 5/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
Population served record for Greenlawn Water District
EPA SDWIS lists 42,000 people served and 11,500 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
87 violations · 42,000 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 Greenlawn Water District
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.