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Warren County, New Jersey — public water systems

At a glance

219 active public water systems are filed under Warren County, New Jersey in EPA's SDWIS records, together reporting 326,592 people served. The largest is Nj American Water - Short Hills, which reports serving 217,230 people. 24 are community water systems serving people where they live; the other 195 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.

Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

219

Population served

326.6K

Community systems

24

Groundwater share

99.1%

How does Warren County compare with other New Jersey counties?

Warren County has the 6th-most active public water systems among the 62 counties listed for active New Jersey systems in EPA records; among the 27 with 3 or more systems, the median has 101. Its systems report 326,592 people served in total, the 13th-largest county figure in the state and 3.4% of the statewide total. The average system here reports serving 1,491 people, about half of the New Jersey average of 2,750. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.

Where does Warren County's drinking water come from?

By primary water source, Warren County's active systems draw on groundwater (215, 98%), surface water (2, 0.9%), groundwater under influence of surface water (1, 0.5%) and purchased groundwater (1, 0.5%). Overall, 99% rely mainly on groundwater (including purchased groundwater) and 0.9% on surface water, compared with 96% and 4.5% across New Jersey. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Nj American Water - Short Hills, draws primarily on surface water.

What kinds of water systems operate in Warren County?

Warren County's active systems break down as 24 community systems (11%), 37 non-transient non-community systems (17%) and 158 transient non-community systems (72%). 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. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. 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. EPA lists their owner types as private (81%), local government (13%), state government (4.1%) and federal government (1.8%).

The 50 largest water systems in Warren County

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Active public water systems in Warren County, New Jersey
#Water systemCountyPopulation servedTypeSource
1Nj American Water - Short HillsWarren + 6 more217,230CommunitySurface water
2Aqua Nj - PhillipsburgWarren26,686CommunityGroundwater under influence of surface water
3Hackettstown MuaWarren22,000CommunityGroundwater
4Nj American Water - Washington/OxfordWarren10,719CommunityGroundwater
5Allamuchy Twp Water & SewerWarren5,423CommunityGroundwater
6Nj American Water - BelvidereWarren2,854CommunityGroundwater
7Alpha Municipal Water WorksWarren2,530CommunityGroundwater
8Acme Shopping PlazaWarren1,550Non-transient non-communityGroundwater
9Land of Make BelieveWarren1,506Transient non-communityGroundwater
10Quick Chek #5Warren1,417Transient non-communityGroundwater
11No Warren Reg High SchWarren1,200Non-transient non-communityGroundwater
12Delaware Water Gap Travel PlazaWarren1,150Non-transient non-communityGroundwater
13Travel Centers of AmericaWarren1,070Non-transient non-communityGroundwater
14Belvidere Shopping PlazaWarren953Transient non-communityGroundwater
15Mcdonalds of ClintonWarren842Transient non-communityGroundwater
16Mansfield Twp ElementaryWarren820Non-transient non-communityGroundwater
17Dunkin DonutsWarren814Transient non-communityGroundwater
18Mcdonalds - ColumbiaWarren810Transient non-communityGroundwater
19Township of Blairstown DpwWarren800CommunityGroundwater
20D S M Nutritional Products Inc.Warren636Non-transient non-communitySurface water
21Mamma MariaWarren515Transient non-communityGroundwater
22White Township Dunkin DonutsWarren513Transient non-communityGroundwater
23Hope Tree Dunkin DonutsWarren507Transient non-communityGroundwater
24Del River Family Cmp GrnWarren506Transient non-communityGroundwater
25Mobil/7-ElevenWarren506Transient non-communityGroundwater
26Njdot Route 80 Rest AreaWarren500Transient non-communityGroundwater
27Warren Haven Rehabilitation & Nursing CtWarren430CommunityGroundwater
28Lakeland PlazaWarren418Transient non-communityGroundwater
29Oakwood Bowling Lanes & SportsWarren412Transient non-communityGroundwater
30White Twp Consolidated SchoolWarren410Non-transient non-communityGroundwater
31Kittatinny Visitor CenterWarren403Transient non-communityGroundwater
32Warren Co Library-Cdh BranchWarren358Transient non-communityGroundwater
33Harmony Twp Elementary SchoolWarren353Non-transient non-communityGroundwater
34Camp No-Be-Bo-ScoWarren350Transient non-communityGroundwater
35Veolia Water Nj Independence HighlandWarren350CommunityGroundwater
36Camp No Be Bo Sco (Shower Well)Warren350Transient non-communityGroundwater
37Great Meadows MiddleWarren348Non-transient non-communityGroundwater
38Oxford Furnace LakeWarren310Transient non-communityGroundwater
39Country View Village, LLCWarren310CommunityGroundwater
40Dept of Interior/Delaware Water Gap NraWarren305Transient non-communityGroundwater
41Sunmart Sunoco Station & Convenience StoWarren303Transient non-communityGroundwater
42Mansfield Twp Municipal CompleWarren295Transient non-communityGroundwater
43Fountain MallWarren282Transient non-communityGroundwater
44Hope Twp Elementary SchoolWarren279Non-transient non-communityGroundwater
45Independence CentralschoolWarren260Non-transient non-communityGroundwater
46Rdj ServiceWarren258Transient non-communityGroundwater
47Belvidere Regional PoolWarren257Transient non-communityGroundwater
48Island DragwayWarren255Transient non-communityGroundwater
49Worthington State ParkWarren250Transient non-communityGroundwater
50Knowlton Twp ElementaryWarren250Non-transient non-communityGroundwater

All other water systems in Warren County (169)

The remaining active systems filed under Warren County, largest first, with the population each reports serving.

Warren County water systems: frequently asked questions

How many public water systems are in Warren County, New Jersey?

EPA's SDWIS records file 219 active public water systems under Warren County, New Jersey: 24 community systems (11%), 37 non-transient non-community systems (17%) and 158 transient non-community systems (72%).

Who supplies drinking water in Warren County, NJ?

The largest community water systems filed under Warren County are Nj American Water - Short Hills (217,230 people served), Aqua Nj - Phillipsburg (26,686 people served) and Hackettstown Mua (22,000 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.

Does Warren County's drinking water come from groundwater or surface water?

Of the 219 active public water systems in Warren County, 99% draw mainly on groundwater and 0.9% on surface water, counting purchased supplies. The largest system, Nj American Water - Short Hills, uses surface water.

Where can I find a water quality report for Warren County?

Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 24 community systems are filed under Warren County, so the report to look for is the one from the system that supplies your address.

How can I check violations for a water system in Warren County?

Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.

More New Jersey water systems

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, “Public water systems in Warren County, New Jersey”, https://aquacensus.com/water-systems/new-jersey/warren (data as of October 1, 2026).