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Harford County, Maryland — public water systems

At a glance

226 active public water systems are filed under Harford County, Maryland in EPA's SDWIS records, together reporting 215,993 people served. The largest is Harford County D.P.W., which reports serving 104,567 people. 15 are community water systems serving people where they live; the other 211 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

226

Population served

216K

Community systems

15

Groundwater share

97.8%

How does Harford County compare with other Maryland counties?

Harford County has the 3rd-most active public water systems among the 60 counties listed for active Maryland systems in EPA records; among the 27 with 3 or more systems, the median has 78. Its systems report 215,993 people served in total, the 5th-largest county figure in the state and 3.7% of the statewide total. The average system here reports serving 956 people, about half of the Maryland average of 1,947. 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 Harford County's drinking water come from?

By primary water source, Harford County's active systems draw on groundwater (221, 98%), surface water (3, 1.3%) and purchased surface water (2, 0.9%). Overall, 98% rely mainly on groundwater (including purchased groundwater) and 2.2% on surface water, compared with 97% and 2.6% across Maryland. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Harford County D.P.W., draws primarily on surface water.

What kinds of water systems operate in Harford County?

Harford County's active systems break down as 15 community systems (6.6%), 46 non-transient non-community systems (20%) and 165 transient non-community systems (73%). 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%) and state government (2.2%).

The 50 largest water systems in Harford County

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Active public water systems in Harford County, Maryland
#Water systemCountyPopulation servedTypeSource
1Harford County D.P.W.Harford104,567CommunitySurface water
2City of AberdeenHarford18,006CommunityPurchased surface water
3Chapel Hill - Aberdeen Proving GroundsHarford15,000CommunityGroundwater
4City of Havre De GraceHarford14,000CommunitySurface water
5Maryland American Water CompanyHarford13,200CommunitySurface water
6Harford Community College - Main CampusHarford2,500Non-transient non-communityGroundwater
7Greenridge SubdivisionHarford2,271CommunityPurchased surface water
8Mountain Christian ChurchHarford2,120Transient non-communityGroundwater
9Wawa Foods #559Harford1,823Transient non-communityGroundwater
10North Harford High SchoolHarford1,346Non-transient non-communityGroundwater
11Schucks Corner SheetzHarford1,233Transient non-communityGroundwater
12McdonaldsHarford1,230Transient non-communityGroundwater
13Harford Technical High SchoolHarford1,187Non-transient non-communityGroundwater
14Youths Benefit Elementary SchoolHarford1,175Non-transient non-communityGroundwater
15Fallston High SchoolHarford1,113Non-transient non-communityGroundwater
16North Harford Middle SchoolHarford1,084Non-transient non-communityGroundwater
17Fallston Middle SchoolHarford1,041Non-transient non-communityGroundwater
18Seven-Eleven #22281Harford908Transient non-communityGroundwater
19Royal Farm Store #1Harford812Transient non-communityGroundwater
20Savory Deli and MarketHarford714Transient non-communityGroundwater
21Harford Community CollegeHarford713Non-transient non-communityGroundwater
22Prospect Mill ElementaryHarford691Non-transient non-communityGroundwater
23Forest Hill Elementary SchoolHarford637Non-transient non-communityGroundwater
24Fallston LibraryHarford610Transient non-communityGroundwater
25Highs #1 - WhitefordHarford605Transient non-communityGroundwater
26North Bend Elementary SchoolHarford534Non-transient non-communityGroundwater
27St. Marks Church - MultipurposeHarford503Transient non-communityGroundwater
28Harford Christian SchoolHarford500Non-transient non-communityGroundwater
29Swan Harbour Dell Mobile Home ParkHarford500CommunityGroundwater
30North Harford ElementaryHarford464Non-transient non-communityGroundwater
31Jarrettsville ElementaryHarford445Non-transient non-communityGroundwater
32Churchville Elementary SchoolHarford441Non-transient non-communityGroundwater
33Edgeley Grove Park - Annies Play GroundHarford400Transient non-communityGroundwater
34Royal Farm Store #95Harford400Transient non-communityGroundwater
35Valley Brook Swim ClubHarford400Transient non-communityGroundwater
36Jarrettsville Plaza Shopping CenterHarford383Transient non-communityGroundwater
37Tiffanee & Co Bakery/GoodwillHarford354Transient non-communityGroundwater
38Village Square Shopping CenterHarford315Transient non-communityGroundwater
39Arctic Circle Drive-inHarford310Transient non-communityGroundwater
40Dublin Elementary SchoolHarford308Non-transient non-communityGroundwater
41Walgreens #19144Harford304Transient non-communityGroundwater
42Broadcreek Camp SaffranHarford302Transient non-communityGroundwater
43Hickory Recreation CenterHarford300Transient non-communityGroundwater
44Forest Hill Recreation Center Well 2Harford300Transient non-communityGroundwater
45Grace Assembly of GodHarford300Transient non-communityGroundwater
46Forest Hill Recreation Center Well 1Harford300Transient non-communityGroundwater
47Harford AcademyHarford292Non-transient non-communityGroundwater
48Churchville Rec Center Main BldgHarford280Transient non-communityGroundwater
49Penn Mar Plaza and Buon GustoHarford275Transient non-communityGroundwater
50Dunkin Donuts JarrettsvilleHarford275Transient non-communityGroundwater

All other water systems in Harford County (176)

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

Harford County water systems: frequently asked questions

How many public water systems are in Harford County, Maryland?

EPA's SDWIS records file 226 active public water systems under Harford County, Maryland: 15 community systems (6.6%), 46 non-transient non-community systems (20%) and 165 transient non-community systems (73%).

Who supplies drinking water in Harford County, MD?

The largest community water systems filed under Harford County are Harford County D.P.W. (104,567 people served), City of Aberdeen (18,006 people served) and Chapel Hill - Aberdeen Proving Grounds (15,000 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 Harford County's drinking water come from groundwater or surface water?

Of the 226 active public water systems in Harford County, 98% draw mainly on groundwater and 2.2% on surface water, counting purchased supplies. The largest system, Harford County D.P.W., uses surface water.

Where can I find a water quality report for Harford 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. 15 community systems are filed under Harford 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 Harford 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 Maryland 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 Harford County, Maryland”, https://aquacensus.com/water-systems/maryland/harford (data as of October 1, 2026).