Community Water System · PWS NY2902837
Massapequa WD
Operator location Massapequa, New York - 0% of 346 violations are health-based (lower-third health share (≤ 1%)); groundwater source; 43,000 served per SDWIS.
- 43,000
- People served (this PWS)
- 346
- EPA violations (this PWS)
- 0
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Massapequa WD standing, high SDWIS violation third
0% of 346 recorded violations are health-based - lower-third health share (≤ 1%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 0% is lower-third health share (≤ 1%). UCMR5: UCMR5 tested, none detected. Population rank #1,290 of 29,740 among systems serving 500+.
The verdict
Massapequa WD sits in the upper third of the sitemap cohort by violation count (346), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (43,000; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is only 0% - almost all of this trail is monitoring or reporting. UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #1,290 of 29,740
- Population · /systems
- #42 of 1,204
- Population · NY
- 346
- Total EPA violations on record
- 0%
- 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
- Community
- Owner Type
- Public/Private
- Connections
- 13,743
- County
- Nassau
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 344
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Heptachlor epoxide | MR | 12 | 2005 |
| 2,4,5-TP | MR | 12 | 2005 |
| Endrin | MR | 12 | 2005 |
| ETHYLENE DIBROMIDE | MR | 12 | 2005 |
| HEXACHLOROBENZENE | MR | 12 | 2005 |
| Benzo(a)pyrene | MR | 12 | 2005 |
| Total Polychlorinated Biphenyls (PCB) | MR | 12 | 2005 |
| Chlordane | MR | 12 | 2005 |
| Picloram | MR | 12 | 2005 |
| Hexachlorocyclopentadiene | MR | 12 | 2005 |
| Aldicarb sulfone | MR | 12 | 2005 |
| Carbofuran | MR | 12 | 2005 |
| BHC-GAMMA | MR | 12 | 2005 |
| Heptachlor | MR | 12 | 2005 |
| 2,4-D | MR | 12 | 2005 |
| Methoxychlor | MR | 12 | 2005 |
| Pentachlorophenol | MR | 12 | 2005 |
| Toxaphene | MR | 12 | 2005 |
| Dalapon | MR | 12 | 2005 |
| Di(2-ethylhexyl) adipate | MR | 12 | 2005 |
| OXAMYL | MR | 12 | 2005 |
| Simazine | MR | 12 | 2005 |
| Di(2-ethylhexyl) phthalate | MR | 12 | 2005 |
| Dinoseb | MR | 12 | 2005 |
| Aldicarb sulfoxide | MR | 12 | 2005 |
| Aldicarb | MR | 12 | 2005 |
| LASSO | MR | 12 | 2005 |
| Atrazine | MR | 12 | 2005 |
| TTHM | MR | 4 | 2018 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2018 |
Violation Count vs. the National Corpus
Massapequa WD has 346 recorded EPA violations, 92% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 8% carry more. 0% of this system's own violations are health-based (0 of 346), and it ranks #1,290 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)
346 Higher than most more violations than 92% 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. 0 of 522 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| 9Cl-PF3ONS | 7/8/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 7/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 7/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 7/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 7/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBA | 7/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 7/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 7/8/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 6:2 FTS | 7/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 7/8/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTrDA | 7/8/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 7/8/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHpS | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 7/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 7/8/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 7/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 4:2 FTS | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 7/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 7/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 7/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 7/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 7/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 7/8/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/8/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFEESA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 7/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 7/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 7/8/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 7/8/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 7/8/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
Health-based violations on Massapequa WD
0 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NY2902837.
Sources: EPA SDWIS · New York State Department of Health, Public Water Systems
Nationwide peers
346 violations · 43,000 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 Massapequa 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.