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Monmouth County, New Jersey — public water systems

At a glance

288 active public water systems are filed under Monmouth County, New Jersey in EPA's SDWIS records, together reporting 715,906 people served. The largest is Nj American Water - Coastal North, which reports serving 377,613 people. 39 are community water systems serving people where they live; the other 249 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

288

Population served

715.9K

Community systems

39

Groundwater share

91%

How does Monmouth County compare with other New Jersey counties?

Monmouth County has the 5th-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 715,906 people served in total, the 4th-largest county figure in the state and 7.4% of the statewide total. The average system here reports serving 2,486 people, roughly in line with 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 Monmouth County's drinking water come from?

By primary water source, Monmouth County's active systems draw on groundwater (262, 91%), purchased surface water (23, 8%) and surface water (3, 1%). Overall, 91% rely mainly on groundwater (including purchased groundwater) and 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 - Coastal North, draws primarily on surface water.

What kinds of water systems operate in Monmouth County?

Monmouth County's active systems break down as 39 community systems (14%), 65 non-transient non-community systems (23%) and 184 transient non-community systems (64%). 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 (78%), local government (20%), state government (1.7%) and federal government (0.7%).

The 50 largest water systems in Monmouth County

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Active public water systems in Monmouth County, New Jersey
#Water systemCountyPopulation servedTypeSource
1Nj American Water - Coastal NorthMonmouth + 1 more377,613CommunitySurface water
2Gordons Corner Water CoMonmouth46,196CommunityPurchased surface water
3Freehold Twp Water DeptMonmouth29,831CommunityPurchased surface water
4Marlboro Township Water Utility DivisionMonmouth29,480CommunityPurchased surface water
5Wall Twp Water DeptMonmouth26,000CommunityPurchased surface water
6Belmar Water DeptMonmouth20,000CommunityPurchased surface water
7Manasquan Water DepartmeMonmouth14,000CommunityGroundwater
8Red Bank Water DeptMonmouth12,520CommunityPurchased surface water
9Spring Lake Water DepartmentMonmouth11,270CommunityPurchased surface water
10Freehold Borough Water DMonmouth11,029CommunityGroundwater
11Keansburg Water & Sewer Dept.Monmouth10,105CommunityPurchased surface water
12Matawan Borough Water DeMonmouth + 1 more9,084CommunityPurchased surface water
13Manalapan Twp - Knob HillMonmouth8,700CommunityPurchased surface water
14Keyport Water DeptMonmouth7,500CommunityPurchased surface water
15Aberdeen - Cliffwood/Cliffwood BeachMonmouth6,775CommunityPurchased surface water
16Borough of Springlake HeightsMonmouth5,000CommunityPurchased surface water
17Avon By the Sea Water DeMonmouth5,000CommunityPurchased surface water
18Brielle Water DeptMonmouth4,800CommunityPurchased surface water
19Atlantic Highlands WaterMonmouth4,385CommunityGroundwater
20Lake Como Water DeptMonmouth3,000CommunityPurchased surface water
21Wawa #909Monmouth2,995Non-transient non-communityGroundwater
22Delicious Orchard MarketMonmouth2,725Non-transient non-communityGroundwater
23Sea Girt Water DeptMonmouth2,636CommunityPurchased surface water
24Englishtown Water DeptMonmouth2,504CommunityPurchased surface water
25Wawa #910Monmouth2,457Non-transient non-communityGroundwater
26Aberdeen- High School/Oakshade AreaMonmouth2,123CommunityPurchased surface water
27Colts Neck High SchoolMonmouth2,100Non-transient non-communityGroundwater
28Monmouth County Park SystemMonmouth2,021Transient non-communityGroundwater
29Allentown Water DeptMonmouth2,000CommunityGroundwater
30Mcdonalds Restaurant #6214Monmouth1,620Non-transient non-communityGroundwater
31Farmingdale Water DeptMonmouth1,500CommunityGroundwater
32Quick Chek Store #178Monmouth1,240Non-transient non-communityGroundwater
33Us Naval Weapons StationMonmouth1,200CommunityPurchased surface water
34Manasquan Reservoir Visitor CenterMonmouth1,008Transient non-communityGroundwater
35The Orchards at Colts NeckMonmouth950Non-transient non-communityGroundwater
36Roosevelt Water DeptMonmouth880CommunityGroundwater
37Millstone Twp Middle SchoolMonmouth850Non-transient non-communityGroundwater
38Burger King #13470Monmouth848Transient non-communityGroundwater
39Mcdonalds RestaurantMonmouth821Transient non-communityGroundwater
40St. Josephs ChurchMonmouth802Transient non-communityGroundwater
41Manalapan Twp Wd Tracy StationMonmouth800CommunityPurchased surface water
42Black Bear Day Camp Well 3Monmouth700Transient non-communityGroundwater
43Black Bear Lake Day Camp #2Monmouth700Transient non-communityGroundwater
44Church of St. William the AbbotMonmouth650Non-transient non-communityGroundwater
45Millstone Twp Primary SchoolMonmouth650Non-transient non-communityGroundwater
46Veolia Water New Jersey Colts NeckMonmouth640CommunityPurchased surface water
47Frog Bridge Day Camp & Tadpole Village PMonmouth618Transient non-communityGroundwater
48Pine Grove Day Camp BldgMonmouth610Transient non-communityGroundwater
49Pine Grove Day Camp Well#1Monmouth605Transient non-communityGroundwater
50Colts Neck Shopping CtrMonmouth575Non-transient non-communityGroundwater

All other water systems in Monmouth County (237)

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

Monmouth County water systems: frequently asked questions

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

EPA's SDWIS records file 288 active public water systems under Monmouth County, New Jersey: 39 community systems (14%), 65 non-transient non-community systems (23%) and 184 transient non-community systems (64%).

Who supplies drinking water in Monmouth County, NJ?

The largest community water systems filed under Monmouth County are Nj American Water - Coastal North (377,613 people served), Gordons Corner Water Co (46,196 people served) and Freehold Twp Water Dept (29,831 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 Monmouth County's drinking water come from groundwater or surface water?

Of the 288 active public water systems in Monmouth County, 91% draw mainly on groundwater and 9% on surface water, counting purchased supplies. The largest system, Nj American Water - Coastal North, uses surface water.

Where can I find a water quality report for Monmouth 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. 39 community systems are filed under Monmouth 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 Monmouth 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 Monmouth County, New Jersey”, https://aquacensus.com/water-systems/new-jersey/monmouth (data as of October 1, 2026).