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Counties → Maryland

Baltimore County, Maryland

SDWIS compliance plate

Sheet MD005 · Baltimore County 276 sys · 3,504 viol · #1003/3254

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

  • VIOL-SEVERE 60.1% flagged
  • HEALTH-MID 30.5% health
  • RANK-UPPER #1003/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-HIGH 50.0% detect
  • SRC-GW GW lead 97%
  • SYS-LARGE 276 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Dorchester County ( -0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Baltimore County ranks #1,003 of 3,254 counties by people served, and #17 of 24 counties in Maryland. See methodology · corpus placement.

Baltimore County standing, lower-flagged corpus third

Flagged-system rate 60.1% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 30.5% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 50.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #1,003 of 3,254 · #17 of 24 in Maryland.

Flagged-rate neighbourhood around Baltimore County

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

0% 20% 40% 60% 80% 100% Baltimore city · lowest Baltimore · this county Frederick · near Kent · highest 38.5% 60% 60.1% 63.7% 71.4% 71.9% 96.6%

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

Water Systems

System Name Population Violations PFAS
Manor Shopping Center 2,921 137 Detected
Stevenson University 1,313 68 -
Hereford High School 1,300 20 -
Fork Christian Church 1,245 0 -
Hereford Middle School 1,050 18 -
Royal Farms #185 1,031 0 -
Oregon Ridge Park Lodge 1,003 3 -
Gunpowder Falls St Pk Sparks Nature Ctr 1,001 0 -
Gunpowder Falls St Pk Monkton Station 1,001 0 -
Gunpowder Falls State Park Paper Mill 1,001 0 -
Bais Yaakov School for Girls 940 102 -
Stella Maris 873 0 -
Kaiser Permanente South Baltimore 800 0 -
Jacksonville Elementary 618 6 -
Sparks Elementary School 537 2 -
Hereford Plaza (Michaels Pizza, 7-11) 520 2 -
Gunpowder Falls St Pk Camp Cone 501 0 -
Gunpowder Falls St Pk Camp Wood 501 0 -
Gunpowder Falls Freeland Ncr Trail 501 7 -
Pealstone Center-Pool Area 500 1 -
Glen Meadows Retirement Community 468 152 -
Prettyboy Elementary School 460 8 -
Seventh District Elementary 437 17 -
Valley Inn 425 0 -
Camp Puhtok for Boys and Girls 420 0 -
Sunnybrook 416 24 -
Elkridge Estates of Roland Park 414 0 -
Woodberry Crossing 408 0 -
Sportsmans Hall Roller Rink 407 3 -
Hunt Valley Presbyterian Church 400 4 -
Kingsville Elementary School 391 18 -
Maryvale Preparatory School 380 40 -
Carroll Manor Elementary School 370 11 -
St. James Academy 355 57 -
St. Stephen School 350 205 -
Redeemer Classical Christian School 346 57 -
Autumn Lake Healthcare Ruxton 345 0 -
Camp Fretterd Military Reservation 325 16 -
Liberty Christian School 320 20 -
Hillendale Country Club 315 112 -
Meadowcroft Exxon 310 5 -
The Fill'er Up/ Maryland Line Service CT 308 1 -
Dunkin Donut 308 0 -
Gunpowder Falls St Pk Hart-Miller Island 305 2 -
Fifth District Elementary 301 9 -
Paper Mill Village Shopping Center 300 74 -
Glen Arm Maintenance Fclty/Ulla Popken 275 30 -
The Peppered Pig, LLC 260 1 -
Oregon Ridge Park Nature Center 260 7 -
Odyssey School 250 19 -

Compare beyond Maryland

Lower-flagged peers for Baltimore County

Cross-state counties nearest Baltimore County on flagged-system share (60.1%) and cumulative violation count (3,504). 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.