Barnwell Building
PWSID: NY5917426
This system has no unresolved violations. The most recent violation on record was 2025-07-01.
This system has more violations on record than 93% of water systems in New York.
Violation trend: 14.8 per year over the last 5 years, up from 0.8 per year in the previous 5.
System Details
| Population Served | 25 |
| Service Connections | 1 |
| Water Source | Groundwater Under Influence |
| System Type | Non-Transient Non-Community |
| Owner | Private |
| Status | Active |
| City | Pound Ridge |
| EPA ZIP on File | 10576 |
Areas Served
- Westchester County
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Lead (90th percentile) | 0.0190 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0159 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0110 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0090 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0080 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0060 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0059 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0034 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0034 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0033 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0020 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0010 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0010 mg/L | 0.015 mg/L | Below Action Level |
Violation History (83 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 2806 | MCL Measured: 12.90 NG/L (limit: 10.00 NG/L) | 2025-07-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 20.80 NG/L (limit: 10.00 NG/L) | 2025-07-01 | Yes | Acknowledged |
| 0700 | TT | 2025-04-01 | Yes | Returned to Compliance |
| 2805 | MCL Measured: 17.80 NG/L (limit: 10.00 NG/L) | 2025-04-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 17.80 NG/L (limit: 10.00 NG/L) | 2025-04-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 22.40 NG/L (limit: 10.00 NG/L) | 2025-01-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 22.40 NG/L (limit: 10.00 NG/L) | 2025-01-01 | Yes | Acknowledged |
| 2806 | MCL Measured: 11.50 NG/L (limit: 10.00 NG/L) | 2025-01-01 | Yes | Acknowledged |
| 2806 | MCL Measured: 11.50 NG/L (limit: 10.00 NG/L) | 2025-01-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 13.70 NG/L (limit: 10.00 NG/L) | 2025-01-01 | Yes | Acknowledged |
| 2950 | MR | 2025-01-01 | Major | Acknowledged |
| 2456 | MR | 2025-01-01 | Major | Acknowledged |
| 2805 | MCL Measured: 24.90 NG/L (limit: 10.00 NG/L) | 2024-10-01 | Yes | Acknowledged |
| 2806 | MCL Measured: 14.50 NG/L (limit: 10.00 NG/L) | 2024-10-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 20.00 NG/L (limit: 10.00 NG/L) | 2024-07-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 20.00 NG/L (limit: 10.00 NG/L) | 2024-07-01 | Yes | Acknowledged |
| 2806 | MCL Measured: 15.70 NG/L (limit: 10.00 NG/L) | 2024-07-01 | Yes | Acknowledged |
| 2806 | MCL Measured: 15.70 NG/L (limit: 10.00 NG/L) | 2024-07-01 | Yes | Acknowledged |
| 5000 | MR | 2024-07-01 | Acknowledged | |
| 5000 | MR | 2024-07-01 | Returned to Compliance | |
| 2805 | MCL Measured: 11.20 NG/L (limit: 10.00 NG/L) | 2024-04-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 11.20 NG/L (limit: 10.00 NG/L) | 2024-04-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 15.70 NG/L (limit: 10.00 NG/L) | 2024-01-01 | Yes | Acknowledged |
| 5000 | MR | 2024-01-01 | Returned to Compliance | |
| 5000 | MR | 2024-01-01 | Returned to Compliance | |
| 5000 | TT | 2024-01-01 | Yes | Returned to Compliance |
| 5000 | TT | 2024-01-01 | Yes | Returned to Compliance |
| 5000 | MR | 2024-01-01 | Returned to Compliance | |
| 5000 | MR | 2024-01-01 | Returned to Compliance | |
| 5000 | MR | 2024-01-01 | Acknowledged | |
| 5000 | MR | 2024-01-01 | Acknowledged | |
| 5000 | MR | 2024-01-01 | Acknowledged | |
| 2950 | MR | 2024-01-01 | Major | Returned to Compliance |
| 2950 | MR | 2024-01-01 | Major | Acknowledged |
| 2950 | MR | 2024-01-01 | Major | Acknowledged |
| 2456 | MR | 2024-01-01 | Major | Returned to Compliance |
| 2456 | MR | 2024-01-01 | Major | Acknowledged |
| 2456 | MR | 2024-01-01 | Major | Acknowledged |
| 2805 | MCL Measured: 18.70 NG/L (limit: 10.00 NG/L) | 2023-10-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 18.70 NG/L (limit: 10.00 NG/L) | 2023-10-01 | Yes | Acknowledged |
| 2806 | MCL Measured: 11.90 NG/L (limit: 10.00 NG/L) | 2023-10-01 | Yes | Acknowledged |
| 2806 | MCL Measured: 11.90 NG/L (limit: 10.00 NG/L) | 2023-10-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 22.60 NG/L (limit: 10.00 NG/L) | 2023-07-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 22.60 NG/L (limit: 10.00 NG/L) | 2023-07-01 | Yes | Acknowledged |
| 2806 | MCL Measured: 11.95 NG/L (limit: 10.00 NG/L) | 2023-07-01 | Yes | Acknowledged |
| 2806 | MCL Measured: 11.95 NG/L (limit: 10.00 NG/L) | 2023-07-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 23.90 NG/L (limit: 10.00 NG/L) | 2023-04-01 | Yes | Acknowledged |
| 2805 | MCL Measured: 23.90 NG/L (limit: 10.00 NG/L) | 2023-04-01 | Yes | Acknowledged |
| 2806 | MCL Measured: 13.00 NG/L (limit: 10.00 NG/L) | 2023-04-01 | Yes | Acknowledged |
| 2806 | MCL Measured: 13.00 NG/L (limit: 10.00 NG/L) | 2023-04-01 | Yes | Acknowledged |
Showing 50 of 83 historical violations.
Understanding This Water System's Record
Barnwell Building is a non-transient non-community water system that draws from groundwater under influence sources and serves a population of 25 in Pound Ridge, New York. This page shows its complete compliance history as reported to the EPA's Safe Drinking Water Information System (SDWIS), the federal database that tracks every public water system in the United States.
What Do These Violations Mean?
Health-based violations mean the system exceeded an EPA maximum contaminant level (MCL) or failed to provide required treatment. These indicate potential health risks from contaminants like lead, arsenic, bacteria, nitrates, or disinfection byproducts. Non-health-based violations involve monitoring, reporting, or procedural requirements — the system missed a testing deadline or failed to notify customers, but contaminant levels were not necessarily unsafe.
What Should You Do?
Your water utility is required to publish an annual Consumer Confidence Report (CCR) that details test results and any violations. If your system has active health-based violations, consider a certified water filter rated for the specific contaminants involved. The contaminant guides on this site explain health risks and filter options for common pollutants. For the most current results, contact your water utility directly — EPA data can lag weeks or months behind real-time testing.