Community Water System · PWS NY5103700
Dering Harbor Water District
Shelter Island Heights, New York 11965 — drinking water served from groundwater sources to 14 people, tracked in EPA SDWIS and UCMR5.
- 14
- People served
- 107
- EPA violations
- 2
- Health-based
- Untested
- UCMR5 result
The verdict
EPA records 107 drinking-water violations at Dering Harbor Water District, 2% of them health-based — above the New York per-system average.
- 107
- Total EPA violations on record
- 2%
- Health-based (MCL / treatment failure)
- 14
- People served by this system
- N/A
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: Dering Harbor Water District
Dering Harbor Water District is a local-owned community water system that delivers drinking water to 14 residents in Shelter Island Heights, New York (Suffolk County) through 37 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 107 total violations for this system , of which 2 (2%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 90 monitoring and reporting violations are on file. The most recent violation on record dates to 2014.
The most frequently cited contaminant at this system is Consumer Confidence Rule, recorded in 8 violations (Other). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.
Across New York, EPA tracks 8,098 public water systems serving 19,294,951 people, with 552,003 cumulative violations and 26,817 health-based violations on record. About 94% of systems in the state carry at least one violation, and state-wide the average per system is 68.2 violations. Dering Harbor Water District's 107 violations sit above the New York average. Statewide, 129 of 332 UCMR5-tested systems have reported PFAS detections (38.9%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 37
- County
- Suffolk
- School/Daycare
- No
- MCL Violations
- 2
- Monitoring Violations
- 90
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Consumer Confidence Rule | Other | 8 | 2008 |
| Dalapon | MR | 3 | 2004 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2004 |
| Picloram | MR | 3 | 2004 |
| Dinoseb | MR | 3 | 2004 |
| Hexachlorocyclopentadiene | MR | 3 | 2004 |
| Carbofuran | MR | 3 | 2004 |
| Aldicarb | MR | 3 | 2004 |
| LASSO | MR | 3 | 2004 |
| Heptachlor epoxide | MR | 3 | 2004 |
| HEXACHLOROBENZENE | MR | 3 | 2004 |
| Benzo(a)pyrene | MR | 3 | 2004 |
| Total Polychlorinated Biphenyls (PCB) | MR | 3 | 2004 |
| Mercury | MR | 3 | 2014 |
| Endrin | MR | 3 | 2004 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2004 |
| Chlordane | MR | 3 | 2004 |
| BHC-GAMMA | MR | 3 | 2004 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2013 |
| Aldicarb sulfoxide | MR | 3 | 2004 |
| Pentachlorophenol | MR | 3 | 2004 |
| Methoxychlor | MR | 3 | 2004 |
| Heptachlor | MR | 3 | 2004 |
| OXAMYL | MR | 3 | 2004 |
| Simazine | MR | 3 | 2004 |
| ETHYLENE DIBROMIDE | MR | 3 | 2004 |
| Aldicarb sulfone | MR | 3 | 2004 |
| Toxaphene | MR | 3 | 2004 |
| Atrazine | MR | 3 | 2004 |
| 2,4,5-TP | MR | 3 | 2004 |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Dering Harbor Water District.
EPA SDWIS — Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID NY5103700 on SDWISSource: EPA SDWIS Federal Reports Search
New York Drinking Water Authority
New York State Department of Health — Public Water Systems is the primacy agency that licenses and inspects Dering Harbor Water District under EPA-delegated authority.
Open NY regulator portalSource: New York State Department of Health — Public Water Systems
Violation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 2014 | Mercury | MR | 3 | SDWIS / NY5103700 / 1035 |
| 2013 | Total Haloacetic Acids (HAA5) | MR | 3 | SDWIS / NY5103700 / 2456 |
| 2008 | Consumer Confidence Rule | Other | 8 | SDWIS / NY5103700 / 7000 |
| 2004 | Dalapon | MR | 3 | SDWIS / NY5103700 / 2031 |
| 2004 | Di(2-ethylhexyl) adipate | MR | 3 | SDWIS / NY5103700 / 2035 |
| 2004 | Picloram | MR | 3 | SDWIS / NY5103700 / 2040 |
| 2004 | Dinoseb | MR | 3 | SDWIS / NY5103700 / 2041 |
| 2004 | Hexachlorocyclopentadiene | MR | 3 | SDWIS / NY5103700 / 2042 |
| 2004 | Carbofuran | MR | 3 | SDWIS / NY5103700 / 2046 |
| 2004 | Aldicarb | MR | 3 | SDWIS / NY5103700 / 2047 |
| 2004 | LASSO | MR | 3 | SDWIS / NY5103700 / 2051 |
| 2004 | Heptachlor epoxide | MR | 3 | SDWIS / NY5103700 / 2067 |
| 2004 | HEXACHLOROBENZENE | MR | 3 | SDWIS / NY5103700 / 2274 |
| 2004 | Benzo(a)pyrene | MR | 3 | SDWIS / NY5103700 / 2306 |
| 2004 | Total Polychlorinated Biphenyls (PCB) | MR | 3 | SDWIS / NY5103700 / 2383 |
How Dering Harbor Water District Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | Dering Harbor Water District | New York avg | Federal benchmark |
|---|---|---|---|
| Total violations | 107 | 68.2 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 2 | 3.3 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 38.9% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 14 | 2,383 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 8,098 regulated public water systems in New York.
Federal MCL reference — Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
Is Dering Harbor Water District water safe to drink? ▼
How many people does Dering Harbor Water District serve? ▼
What type of violations does Dering Harbor Water District have? ▼
Has PFAS been detected in Dering Harbor Water District water? ▼
What water source does Dering Harbor Water District use? ▼
Where does this data come from? ▼
Explore PlainWater
Read our methodology — how this data is sourced, computed, and verified.