Public water system · NJ2110003
ActiveAqua Nj - Harkers Hollow
At a glance
Aqua Nj - Harkers Hollow (PWSID NJ2110003) is an active community water system in Warren County, New Jersey. It reports serving 40 people through 17 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, none is health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
40
Service connections
17
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Aqua Nj - Harkers Hollow compare with other water systems in Warren County?
By EPA's size categories, Aqua Nj - Harkers Hollow is a very small system (500 people or fewer). Warren County has 219 active public water systems. Its population served is well below the county average of 1,491 people per system, and accounts for less than 0.1% of the 326,592 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 community water system reports serving 6,703 people, so Aqua Nj - Harkers Hollow is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. New Jersey has 582 active community water systems, 17% 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 Aqua Nj - Harkers Hollow?
EPA lists Aqua Nj - Harkers Hollow 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. 177 of the 219 active systems in Warren County (81%) are also privately owned.
Does Aqua Nj - Harkers Hollow have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2025. The violations listed here began between January 2017 and April 2025. By type: 10 monitoring and reporting and 2 reporting. The contaminant or rule involved most often is Lead and Copper Rule (5 of them). EPA lists 10 as resolved, 1 as unaddressed and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-04-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2024-07-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Archived |
| 2023-11-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31 | Groundwater Rulecode 0700 | No | Resolved |
| 2023-09-29 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2023-04-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2021-09-29 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2021-05-11 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2020-08-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2020-08-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2019-12-11 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2017-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylbenzenecode 2992 | No | Resolved |
| 2017-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2,4-Trichlorobenzenecode 2378 | 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.
Aqua Nj - Harkers Hollow: frequently asked questions
Who runs Aqua Nj - Harkers Hollow?
Aqua Nj - Harkers Hollow (PWSID NJ2110003) is a community water system privately owned. It is regulated by the NJ state drinking water program.
How many people does Aqua Nj - Harkers Hollow serve?
Aqua Nj - Harkers Hollow reports serving 40 people through 17 service connections in Warren County, New Jersey.
Where does Aqua Nj - Harkers Hollow 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 Aqua Nj - Harkers Hollow have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2025. 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 Aqua Nj - Harkers Hollow'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, none is health-based, and the most recent began in April 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the NJ state drinking water program.
Where can I find Aqua Nj - Harkers Hollow's water quality report?
As a community water system, Aqua Nj - Harkers Hollow must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Warren County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Nj American Water - Short Hills | Warren + 6 more | 217,230 | Community | Surface water |
| Aqua Nj - Phillipsburg | Warren | 26,686 | Community | Groundwater under influence of surface water |
| Hackettstown Mua | Warren | 22,000 | Community | Groundwater |
| Nj American Water - Washington/Oxford | Warren | 10,719 | Community | Groundwater |
| Allamuchy Twp Water & Sewer | Warren | 5,423 | Community | Groundwater |
| Nj American Water - Belvidere | Warren | 2,854 | 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, “Aqua Nj - Harkers Hollow, PWSID NJ2110003, New Jersey”, https://aquacensus.com/water-systems/new-jersey/aqua-nj-harkers-hollow-nj2110003 (data as of October 1, 2026).