St John on the Mountain
PWSID: NJ1802313
This system has no unresolved violations. The most recent violation on record was 2025-04-01.
This system has more violations on record than 70% of water systems in New Jersey.
Violation trend: 1.4 per year over the last 5 years, up from 1.0 per year in the previous 5.
System Details
| Population Served | 180 |
| Service Connections | 1 |
| Water Source | Groundwater |
| System Type | Non-Transient Non-Community |
| Owner | Private |
| Status | Active |
| City | Bernardsville |
| EPA ZIP on File | 07924 |
Areas Served
- Somerset County
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Lead (90th percentile) | 0.5000 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0192 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0142 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0094 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0087 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0081 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0069 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0055 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0051 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0048 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0043 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0040 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) | 0.0033 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0030 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0027 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
Violation History (13 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 5000 | MR | 2025-04-01 | Returned to Compliance | |
| 5000 | TT | 2025-01-01 | Yes | Acknowledged |
| 5000 | TT | 2024-07-01 | Yes | Acknowledged |
| 5000 | TT | 2024-07-01 | Yes | Acknowledged |
| 5000 | MR | 2023-04-01 | Returned to Compliance | |
| 5000 | MR | 2023-04-01 | Returned to Compliance | |
| 7500 | Other | 2021-12-24 | Returned to Compliance | |
| 2931 | MR | 2020-01-01 | Major | Returned to Compliance |
| 2931 | MR | 2020-01-01 | Major | Returned to Compliance |
| 2946 | MR | 2020-01-01 | Major | Returned to Compliance |
| 2946 | MR | 2020-01-01 | Major | Returned to Compliance |
| 5000 | MR | 2019-04-01 | Returned to Compliance | |
| 5000 | MR | 1994-01-02 | Returned to Compliance |
Understanding This Water System's Record
St John on the Mountain is a non-transient non-community water system that draws from groundwater sources and serves a population of 180 in Bernardsville, New Jersey. 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.