Public water system · NJ1408001
ActiveDenville Twp Water Dept
At a glance
Denville Twp Water Dept (PWSID NJ1408001) is an active community water system in Morris County, New Jersey. It reports serving 15,881 people through 5,000 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
15,881
Service connections
5,000
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Denville Twp Water Dept compare with other water systems in Morris County?
By EPA's size categories, Denville Twp Water Dept is a large system (10,001 to 100,000 people). Morris County has 302 active public water systems, and Denville Twp Water Dept is the 5th-largest of them by population served. Its population served is about 11 times the county average of 1,490 people per system, and accounts for 3.5% of the 449,898 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 Denville Twp Water Dept is about 137% above 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 Denville Twp Water Dept?
EPA lists Denville Twp Water Dept as owned by a local government. 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. 67 of the 302 active systems in Morris County (22%) are also owned by a local government.
Does Denville Twp Water Dept have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2025. The violations listed here began between January 2025 and January 2025. By type: 12 monitoring and reporting. The contaminants or rules involved are Trichloroethylene, cis-1,2-Dichloroethylene, 1,2-Dichloroethane and o-Dichlorobenzene. EPA lists 12 as resolved. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Trichloroethylenecode 2984 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | cis-1,2-Dichloroethylenecode 2380 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dichloroethanecode 2980 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | o-Dichlorobenzenecode 2968 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Styrenecode 2996 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Tetrachloroethylenecode 2987 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Vinyl chloridecode 2976 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | p-Dichlorobenzenecode 2969 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylbenzenecode 2992 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1-Dichloroethylenecode 2977 | No | Resolved |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | No | Resolved |
| 2025-01-01 | 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.
Denville Twp Water Dept: frequently asked questions
Who runs Denville Twp Water Dept?
Denville Twp Water Dept (PWSID NJ1408001) is a community water system owned by a local government. It is regulated by the NJ state drinking water program.
How many people does Denville Twp Water Dept serve?
Denville Twp Water Dept reports serving 15,881 people through 5,000 service connections in Morris County, New Jersey.
Where does Denville Twp Water Dept 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 Denville Twp Water Dept 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 January 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 Denville Twp Water Dept'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 January 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 Denville Twp Water Dept's water quality report?
As a community water system, Denville Twp Water Dept 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 Morris County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Southeast Morris County Mua | Morris | 62,349 | Community | Surface water |
| Parsippany-Troy Hills Water Department | Morris | 50,400 | Community | Purchased surface water |
| Dover Water Commission | Morris | 27,806 | Community | Groundwater |
| Montville Twp Mua | Morris | 22,000 | Community | Purchased surface water |
| Madison Water Dept | Morris | 15,820 | Community | Groundwater |
| Randolph Twp Public Works Dept | Morris | 14,820 | Community | Purchased 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, “Denville Twp Water Dept, PWSID NJ1408001, New Jersey”, https://aquacensus.com/water-systems/new-jersey/denville-twp-water-dept-nj1408001 (data as of October 1, 2026).