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Counties → Maryland

Harford County, Maryland

SDWIS compliance plate

Sheet MD025 · Harford County 238 sys · 3,670 viol · #313/3254

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

  • VIOL-SEVERE 88.2% flagged
  • HEALTH-MID 30.6% health
  • RANK-TOP #313/3254
  • PHOTO-FINISH ±0.7 pp
  • PFAS-MID 40.0% detect
  • SRC-GW GW lead 98%
  • SYS-LARGE 238 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Montgomery County ( -0.7 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Harford County ranks #313 of 3,254 counties by people served, and #5 of 24 counties in Maryland. See methodology · corpus placement.

Harford County standing, lower-flagged corpus third

Flagged-system rate 88.2% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 30.6% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 40.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #313 of 3,254 · #5 of 24 in Maryland.

Flagged-rate neighbourhood around Harford County

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

0% 20% 40% 60% 80% 100% Baltimore city · lowest Talbot · near Harford · this county Kent · highest 38.5% 85.4% 85.4% 87.5% 88.2% 92.1% 96.6%

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

Water Systems

System Name Population Violations PFAS
Harford County D.p.w. 104,567 27 Clean
City of Aberdeen 18,006 5 Detected
Chapel Hill - Aberdeen Proving Grounds 15,000 14 Clean
City of Havre de Grace 14,000 126 Clean
Maryland American Water Company 13,200 12 Detected
Harford Community College - Main Campus 2,500 237 -
Greenridge Subdivision 2,271 10 -
Mountain Christian Church 2,120 31 -
Wawa Foods #559 1,823 1 -
North Harford High School 1,346 15 -
Schucks Corner Sheetz 1,233 0 -
McDonalds 1,230 6 -
Harford Technical High School 1,187 30 -
Youths Benefit Elementary School 1,175 27 -
Fallston High School 1,113 16 -
North Harford Middle School 1,084 30 -
Fallston Middle School 1,041 13 -
Seven-Eleven #22281 908 13 -
Royal Farm Store #1 812 0 -
Savory Deli and Market 714 2 -
Harford Community College 713 55 -
Prospect Mill Elementary 691 130 -
Forest Hill Elementary School 637 31 -
Fallston Library 610 8 -
Highs #1 - Whiteford 605 1 -
North Bend Elementary School 534 18 -
St. Marks Church - Multipurpose 503 4 -
Swan Harbour Dell Mobile Home Park 500 105 -
Harford Christian School 500 61 -
North Harford Elementary 464 33 -
Jarrettsville Elementary 445 29 -
Churchville Elementary School 441 26 -
Ez Quick Food Marketand Dunkin Donuts 406 9 -
Dollar General- Street #14890 403 0 -
Valley Brook Swim Club 400 3 -
Royal Farm Store #95 400 4 -
Edgeley Grove Park - Annies Play Ground 400 9 -
Jarrettsville Plaza Shopping Center 383 2 -
Dunkin Donuts/Goodwill 354 6 -
Village Square Shopping Center 315 4 -
Arctic Circle Drive-IN 310 2 -
Dublin Elementary School 308 25 -
Walgreens #19144 304 7 -
Broadcreek Camp Saffran 302 12 -
Forest Hill Recreation Center Well 1 300 0 -
Grace Assembly of God 300 6 -
Hickory Recreation Center 300 0 -
Forest Hill Recreation Center Well 2 300 6 -
Harford Academy 292 20 -
Churchville Rec Center Main Bldg 280 2 -

Compare beyond Maryland

Lower-flagged peers for Harford County

Cross-state counties nearest Harford County on flagged-system share (88.2%) and cumulative violation count (3,670). 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.