PlainWater
Counties → Maryland

Howard County, Maryland

SDWIS compliance plate

Sheet MD027 · Howard County 88 sys · 985 viol · #224/3254

VIOL-SEVERE · HEALTH-MID · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 77.3% flagged
  • HEALTH-MID 38.0% health
  • RANK-TOP #224/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-HIGH 100.0% detect
  • SRC-GW GW lead 98%
  • SYS-MID 88 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Queen Anne's County ( -0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Howard County ranks #224 of 3,254 counties by people served, and #4 of 24 counties in Maryland. See methodology · corpus placement.

Howard County standing, lower-flagged corpus third

Flagged-system rate 77.3% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 38.0% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 100.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #224 of 3,254 · #4 of 24 in Maryland.

Flagged-rate neighbourhood around Howard County

Lowest/highest poles plus in-state counties nearest Howard County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Baltimore city · lowest Queen Anne's · near St. Mary's · near Kent · highest 38.5% 72.7% 77% 77.3% 78.5% 81.4% 96.6%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Howard County D.p.w. Distribution 286,158 20 Detected
Glenelg High School 1,532 26 -
Bushy Park Es/Glenwood MS Complex 1,500 2 -
Highs of Cooksville 1,321 0 -
Royal Farms Store 1,015 0 -
Glenelg Country School 950 65 Detected
Highs of Fulton 758 0 -
McDonalds of Lisbon 735 14 -
St Michaels Catholic Church 697 6 -
Glenwood Library 671 0 -
Folly Quarter Middle School 667 10 -
Dayton Oaks Elementary School 595 0 -
New Hope 7th-Day Adventist Church 558 13 -
Inwood Village Center 534 76 -
Your Journey Child Care 533 4 -
Triadelphia Ridge Elementary 507 11 -
Howard County Fair Main Exhibit Hall 500 2 -
Lisbon Elementary School 492 26 -
Mount Airy Christian Academy 435 25 -
Highs of Glenelg 409 0 -
Glenwood Community Center 366 6 -
Dunkin Donuts - Woodbine 363 0 -
West Friendship Elementary School 350 2 -
Boarmans Meat Market 320 7 -
Lutheran Village at Miller's Grant 315 19 -
Bolder Grill 310 2 -
Schooley Mill Park 307 0 -
Clarksville Lds Church 300 0 -
Country Corner Snowball, Inc 259 2 -
Larriland Farms 252 10 -
West Howard Swim Club 220 7 -
Therapeutic and Recreational Riding Ctr 215 13 -
St. Marks Episcopal Church 205 1 -
Temple Isaiah Synagogue and Preschool 203 14 -
Howard County Fair (Office) 200 9 -
Howard County Fairgrounds - Poultry Bld 200 4 -
Howard County Fair Wash Racks- Well #5 200 2 -
Howard County Fair 4H Hall 200 6 -
Woodstock Inn 183 7 -
Villas at Cattail Creek 170 10 -
Lai Baptist Church 157 0 -
St. Andrews Episcopal Church - Chapel 155 10 -
Western Regional Park Pavilion Well 150 0 -
Western Regional Park 150 4 -
Circle D Farms ( Dowd House) 149 8 -
Cattail Creek Country Club 145 7 -
Carroll Motor Fuel - Lisbon 137 1 -
Calvary Lutheran Church 133 1 -
Ledos Pizza 130 1 -
Woodbine Inn and Collins Inn 121 4 -

Compare beyond Maryland

Lower-flagged peers for Howard County

Cross-state counties nearest Howard County on flagged-system share (77.3%) and cumulative violation count (985). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.