Public water system · NJ1920313
ActiveMountain Shadows Lake I
At a glance
Mountain Shadows Lake I (PWSID NJ1920313) is an active transient non-community water system in Sussex County, New Jersey. It reports serving 276 people through 271 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in May 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
276
Service connections
271
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Mountain Shadows Lake I compare with other water systems in Sussex County?
By EPA's size categories, Mountain Shadows Lake I is a very small system (500 people or fewer). Sussex County has 476 active public water systems. Its population served is about 35% below the county average of 425 people per system, and accounts for 0.1% of the 202,506 people reported by systems filed under the county. Across New Jersey, the 3,496 active systems average 2,750 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Mountain Shadows Lake I is about twice that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. New Jersey has 2,277 active transient non-community water systems, 65% of the state's 3,496 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 3,313 New Jersey systems (95%) list groundwater as their primary source.
Who owns and regulates Mountain Shadows Lake I?
EPA lists Mountain Shadows Lake I as privately owned. The NJ state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 372 of the 476 active systems in Sussex County (78%) are also privately owned.
Does Mountain Shadows Lake I have drinking water violations?
Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in May 2024. The violations listed here began between October 2011 and May 2024. By type: 6 required treatment not met, 2 reporting, 1 public notice, recordkeeping or other, 1 monitoring, 1 contaminant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Revised Total Coliform Rule (9 of them). EPA lists 11 as resolved and 1 as unaddressed. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2024-05-16 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Unaddressed |
| 2024-04-15 | Required treatment not metTreatment Technique Startup Procedures (RTCR) · code 2D | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2023-05-07 | Required treatment not metTreatment Technique Startup Procedures (RTCR) · code 2D | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2020-05-16 | Required treatment not metTreatment Technique Startup Procedures (RTCR) · code 2D | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2019-04-15 | Required treatment not metTreatment Technique Startup Procedures (RTCR) · code 2D | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2018-04-15 | Required treatment not metTreatment Technique Startup Procedures (RTCR) · code 2D | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2017-06-11 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2017-06-01 | Required treatment not metTreatment Technique Startup Procedures (RTCR) · code 2D | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2017-05-11 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2017-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2015-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Mountain Shadows Lake I: frequently asked questions
Who runs Mountain Shadows Lake I?
Mountain Shadows Lake I (PWSID NJ1920313) is a transient non-community water system privately owned. It is regulated by the NJ state drinking water program.
How many people does Mountain Shadows Lake I serve?
Mountain Shadows Lake I reports serving 276 people through 271 service connections in Sussex County, New Jersey.
Where does Mountain Shadows Lake I get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Mountain Shadows Lake I have any drinking water violations?
Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in May 2024. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Mountain Shadows Lake I's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in May 2024. For current results, consult EPA ECHO, or the NJ state drinking water program.
Where can I find Mountain Shadows Lake I's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Mountain Shadows Lake I is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Sussex County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Sparta Twp Water Utility - Lake Mohawk | Sussex | 17,625 | Community | Groundwater |
| Newton Water & Sewer Utility | Sussex | 8,300 | Community | Surface water |
| Hopatcong Water Dept | Sussex | 7,224 | Community | Groundwater |
| Sussex County Fairgrounds | Sussex | 6,246 | Transient non-community | Groundwater |
| Veolia Water New Jersey Vernon Valley | Sussex | 5,517 | Community | Groundwater |
| Franklin Bd of Public Works | Sussex | 5,500 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Mountain Shadows Lake I, PWSID NJ1920313, New Jersey”, https://aquacensus.com/water-systems/new-jersey/mountain-shadows-lake-i-nj1920313 (data as of October 1, 2026).