Howard County, Maryland — public water systems
At a glance
87 active public water systems are filed under Howard County, Maryland in EPA's SDWIS records, together reporting 309,341 people served. The largest is Howard County D.P.W. Distribution, which reports serving 286,158 people. 4 are community water systems serving people where they live; the other 83 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
87
Population served
309.3K
Community systems
4
Groundwater share
96.6%
How does Howard County compare with other Maryland counties?
Howard County has the 12th-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 309,341 people served in total, the 4th-largest county figure in the state and 5.3% of the statewide total. The average system here reports serving 3,556 people, about 83% above 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 Howard County's drinking water come from?
By primary water source, Howard County's active systems draw on groundwater (84, 97%) and purchased surface water (3, 3.4%). Overall, 97% rely mainly on groundwater (including purchased groundwater) and 3.4% 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, Howard County D.P.W. Distribution, draws primarily on purchased surface water.
What kinds of water systems operate in Howard County?
Howard County's active systems break down as 4 community systems (4.6%), 25 non-transient non-community systems (29%) and 58 transient non-community systems (67%). 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 (71%), local government (25%), state government (2.3%) and public/private partnership (1.1%).
The 50 largest water systems in Howard County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Howard County D.P.W. Distribution | Howard | 286,158 | Community | Purchased surface water |
| 2 | Glenelg High School | Howard | 1,532 | Non-transient non-community | Groundwater |
| 3 | Bushy Park Es/Glenwood Ms Complex | Howard | 1,500 | Non-transient non-community | Groundwater |
| 4 | Highs of Cooksville | Howard | 1,321 | Transient non-community | Groundwater |
| 5 | Royal Farms Store | Howard | 1,015 | Transient non-community | Groundwater |
| 6 | Glenelg Country School | Howard | 950 | Non-transient non-community | Groundwater |
| 7 | Highs of Fulton | Howard | 758 | Transient non-community | Groundwater |
| 8 | Mcdonalds of Lisbon | Howard | 735 | Transient non-community | Groundwater |
| 9 | St Michaels Catholic Church | Howard | 697 | Non-transient non-community | Groundwater |
| 10 | Glenwood Library | Howard | 671 | Transient non-community | Groundwater |
| 11 | Folly Quarter Middle School | Howard | 667 | Non-transient non-community | Groundwater |
| 12 | Dayton Oaks Elementary School | Howard | 595 | Non-transient non-community | Groundwater |
| 13 | New Hope 7th-Day Adventist Church | Howard | 558 | Transient non-community | Groundwater |
| 14 | Inwood Village Center | Howard | 534 | Non-transient non-community | Groundwater |
| 15 | Your Journey Child Care | Howard | 533 | Transient non-community | Groundwater |
| 16 | Triadelphia Ridge Elementary | Howard | 507 | Non-transient non-community | Groundwater |
| 17 | Howard County Fair Main Exhibit Hall | Howard | 500 | Transient non-community | Groundwater |
| 18 | Lisbon Elementary School | Howard | 492 | Non-transient non-community | Groundwater |
| 19 | Mount Airy Christian Academy | Howard | 435 | Non-transient non-community | Groundwater |
| 20 | Glenwood Community Center | Howard | 366 | Non-transient non-community | Groundwater |
| 21 | Dunkin Donuts - Woodbine | Howard | 363 | Transient non-community | Groundwater |
| 22 | West Friendship Elementary School | Howard | 350 | Non-transient non-community | Groundwater |
| 23 | Konstantines Greek Taverna | Howard | 322 | Transient non-community | Groundwater |
| 24 | Boarmans Meat Market | Howard | 320 | Transient non-community | Groundwater |
| 25 | Lutheran Village at Miller'S Grant | Howard | 315 | Community | Purchased surface water |
| 26 | Bolder Grill | Howard | 310 | Transient non-community | Groundwater |
| 27 | Schooley Mill Park | Howard | 307 | Transient non-community | Groundwater |
| 28 | Clarksville LDS Church | Howard | 300 | Transient non-community | Groundwater |
| 29 | Country Corner Snowball, Inc. | Howard | 259 | Transient non-community | Groundwater |
| 30 | Larriland Farms | Howard | 252 | Transient non-community | Groundwater |
| 31 | West Howard Swim Club | Howard | 220 | Transient non-community | Groundwater |
| 32 | Therapeutic and Recreational Riding Ctr | Howard | 215 | Transient non-community | Groundwater |
| 33 | St. Marks Episcopal Church | Howard | 205 | Transient non-community | Groundwater |
| 34 | Temple Isaiah Synagogue and Preschool | Howard | 203 | Non-transient non-community | Groundwater |
| 35 | Howard County Fair 4h Hall | Howard | 200 | Transient non-community | Groundwater |
| 36 | Howard County Fair (Office) | Howard | 200 | Transient non-community | Groundwater |
| 37 | Howard County Fairgrounds - Poultry Bld | Howard | 200 | Transient non-community | Groundwater |
| 38 | Howard County Fair Wash Racks- Well #5 | Howard | 200 | Transient non-community | Groundwater |
| 39 | Woodstock Inn | Howard | 183 | Transient non-community | Groundwater |
| 40 | Villas at Cattail Creek | Howard | 170 | Community | Groundwater |
| 41 | Lai Baptist Church | Howard | 157 | Transient non-community | Groundwater |
| 42 | Western Regional Park Pavilion Well | Howard | 150 | Transient non-community | Groundwater |
| 43 | Western Regional Park | Howard | 150 | Transient non-community | Groundwater |
| 44 | Circle D Farms ( Dowd House) | Howard | 149 | Transient non-community | Groundwater |
| 45 | Cattail Creek Country Club | Howard | 145 | Transient non-community | Groundwater |
| 46 | Carroll Motor Fuel - Lisbon | Howard | 137 | Transient non-community | Groundwater |
| 47 | Calvary Lutheran Church | Howard | 133 | Transient non-community | Groundwater |
| 48 | Ledos Pizza | Howard | 130 | Transient non-community | Groundwater |
| 49 | Burntwoods Church | Howard | 121 | Transient non-community | Groundwater |
| 50 | Woodbine Inn and Collins Inn | Howard | 121 | Transient non-community | Groundwater |
All other water systems in Howard County (37)
The remaining active systems filed under Howard County, largest first, with the population each reports serving.
- Ten Oaks Triangle Shopping Center116
- Lighthouse Senior Living Ellicott City113
- Belmont Conf Center Manor House110
- Dunkin Donuts106
- Highs West Friendship105
- Highland Crossing Shopping Center88
- Morgan Station Inn83
- Lisbon Shopping Center/Harvest Fair80
- Peter Pan Learning Center80
- Fox & Barrel Farm Cafe76
- Lisbon Volunteer Fire Department76
- Floyd'S Crossroads Pub -Emmert'S Seafood75
- Glenwood Office Park75
- Fulton Station Shopping Strip72
- Howard Co Dayton Repair Facility70
- Poplar Springs United Methodist Church64
- Lu and Joes Restaurant63
- Friendship Baptist Church58
- Lisbon Um Church53
- St. Andrews Episcopal Church - Parish52
- Bon Secour Spiritual Center50
- Ten Oaks Plaza50
- Glenwood Baptist Church50
- State Highway Adm. Dayton Maint. Shop49
- Full Gospel Baptist Church49
- Mt. Zion Um Church and Preschool47
- West Friendship Shopping Center47
- Lisbon Marathon Gas Station46
- Willow Springs Golf Course44
- Bureau of Highways Cooksville44
- Glenelg Um Church and Nursery School39
- Fox Valley Swimming Pool37
- Circle D Farm Club House36
- U.M. Central Md Research & Education Ctr36
- Belmont Carriage House Conservancy Bldg33
- Williams Gas Pipeline Station #19030
- St. Andrews Episcopal Church - Chapel28
Howard County water systems: frequently asked questions
How many public water systems are in Howard County, Maryland?
EPA's SDWIS records file 87 active public water systems under Howard County, Maryland: 4 community systems (4.6%), 25 non-transient non-community systems (29%) and 58 transient non-community systems (67%).
Who supplies drinking water in Howard County, MD?
The largest community water systems filed under Howard County are Howard County D.P.W. Distribution (286,158 people served), Lutheran Village at Miller'S Grant (315 people served) and Villas at Cattail Creek (170 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 Howard County's drinking water come from groundwater or surface water?
Of the 87 active public water systems in Howard County, 97% draw mainly on groundwater and 3.4% on surface water, counting purchased supplies. The largest system, Howard County D.P.W. Distribution, uses purchased surface water.
Where can I find a water quality report for Howard 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. 4 community systems are filed under Howard 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 Howard 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
- All Maryland public water systems· 2,992 active
- Cecil County· 166 systems
- Charles County· 134 systems
- Worcester County· 120 systems
- Queen Anne's County· 92 systems
- Wicomico County· 85 systems
- Washington County· 78 systems
- How to find out who supplies your drinking water
- How to find and read your annual water quality report
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 Howard County, Maryland”, https://aquacensus.com/water-systems/maryland/howard (data as of October 1, 2026).