Greenport Water District
EPA ID: NY5103703 · 2,050 people served · 6 ZIP codes
While corrective steps may be in progress, Greenport Water District currently shows 4 EPA violations unresolved — serving a population of approximately 2,050.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Greenport Water District Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The Greenport Water District serves a community with a median household income of $119,084 and an estimated 20,103 residents across its service area. Approximately 71% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Greenport Water District's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 1% of homes in Suffolk County, New York rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 80th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Detected Contaminants
How Greenport Water District compares to EPA limits
What This Means For You
Total Trihalomethanes (TTHM) at 2 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Consumer Confidence Report Rule at 4 mg/L exceeds the EPA maximum of mg/L.
Contaminant 2829 at 1 mg/L exceeds the EPA maximum of mg/L.
Contaminant 2959 at 1 mg/L exceeds the EPA maximum of mg/L.
Contaminant 3000 at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 50 detections recorded. 15 exceed federal EPA limits (4 ppt for PFOA/PFOS). 5 exceed state limits.
Total Trihalomethanes (TTHM) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
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Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
GREENPORT WATER DISTRICT (EPA ID: NY5103703) is a community water system in New York that serves approximately 2,050 people from groundwater sources.
This system provides water to 6 ZIP codes across 6 communities.
Average Home Safety Score: B (71/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| June 30, 2025 | Stage 1 DBP Rule | Monitoring | Unresolved |
| May 1, 2024 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| May 1, 2024 | Contaminant 3000 | Monitoring | Unresolved |
| July 1, 2023 | Contaminant 2829 | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting Failure | 4 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 2 | No |
| Contaminant 2829 | Other Violation | 1 | No |
| Contaminant 2959 | Other Violation | 1 | No |
| Contaminant 3000 | Other Violation | 1 | No |
| Contaminant 4109 | Other Violation | 1 | No |
| Stage 1 DBP Rule | Treatment Failure | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 2 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 4 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 11935 — Cutchogue
- 11944 — Greenport
- 11952 — Mattituck
- 11956 — New Suffolk
- 11958 — Peconic
- 11971 — Southold
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Greenport Water District (NY5103703) on EPA.gov.
Frequently Asked Questions
Is Greenport Water District water safe to drink?
Greenport Water District has only monitoring/reporting violations, which are procedural in nature. The system meets federal health-based standards.
How many people does Greenport Water District serve?
Greenport Water District serves approximately 2,050 people across 6 ZIP codes in New York.
Where does Greenport Water District get its water?
The primary water source is groundwater.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Greenport Water District (EPA ID: NY5103703) — request the latest Consumer Confidence Report or ask about specific contaminants.