Total Haloacetic Acids (HAA5) violations in Maryland
32 active public water systems in Maryland had a Total Haloacetic Acids (HAA5) violation in the past three years. What Total Haloacetic Acids (HAA5) is and why it matters.
Systems with a Total Haloacetic Acids (HAA5) violation
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Harford County D.p.w. Harford County |
104,567 | 1 | 0 | |
|
Ocean Pines Worcester County |
11,890 | 1 | 0 | |
|
Town of North East Cecil County |
8,600 | 3 | 0 | |
|
Midland-Lonaconing Allegany County |
5,000 | 4 | 0 | |
|
Town of Leonardtown St. Mary's County |
5,000 | 1 | 0 | |
|
Country Lakes St. Mary's County |
3,016 | 1 | 0 | |
|
Town of North Beach Calvert County |
3,000 | 2 | 0 | |
|
Town of Williamsport Distribution System Washington County |
2,400 | 1 | 0 | |
|
Lakeside Village Washington County |
1,575 | 1 | 0 | |
|
Glenelg High School Howard County |
1,532 | 1 | 0 | |
|
Webster Field Annex, ST Inigoes (navfac) St. Mary's County |
1,200 | 1 | 0 | |
|
Town of Willards Wicomico County |
1,021 | 3 | 0 | |
|
Town of Queenstown Queen Anne's County |
705 | 4 | 0 | |
|
Folly Quarter Middle School Howard County |
667 | 1 | 0 | |
|
Town of Friendsville Garrett County |
622 | 1 | 0 | |
|
North Bend Elementary School Harford County |
534 | 3 | 0 | |
|
Jarrettsville Elementary Harford County |
528 | 2 | 0 | |
|
North Harford Elementary Harford County |
464 | 2 | 0 | |
|
Churchville Elementary School Harford County |
441 | 1 | 0 | |
|
Lutheran Village at Miller's Grant Howard County |
315 | 3 | 0 | |
|
Country Meadows of Frederick Frederick County |
295 | 1 | 0 | |
|
Pilot Travel Center & Arbys Restaurant Garrett County |
280 | 1 | 0 | |
|
Norrisville Elementary School Harford County |
231 | 1 | 0 | |
|
Saint James School Washington County |
200 | 4 | 0 | |
|
The Neighborhoods at St. Elizabeth Baltimore city County |
162 | 4 | 1 | |
|
N.i.h. Animal Center Montgomery County |
150 | 2 | 0 | |
|
The Highlands School Harford County |
125 | 2 | 0 | |
|
Tranquility at Fredericktowne Frederick County |
105 | 4 | 1 | |
|
Princess Royale Hotel Distribution Worcester County |
80 | 3 | 0 | |
|
BB Apartments (prev Woc Village Apts) Worcester County |
40 | 5 | 0 | |
|
Belmont Carriage House Conservancy Bldg Howard County |
33 | 2 | 0 | |
|
West Ocean City Business Park Worcester County |
25 | 4 | 2 |
About this data
A system is counted once if any of its violations in the past three years involved Total Haloacetic Acids (HAA5), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Total Haloacetic Acids (HAA5) alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Maryland records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.