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Counties → Maryland

Carroll County, Maryland

SDWIS compliance plate

Sheet MD013 · Carroll County 224 sys · 3,560 viol · #472/3254

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

  • VIOL-SEVERE 82.1% flagged
  • HEALTH-HIGH 47.8% health
  • RANK-TOP #472/3254
  • PHOTO-FINISH ±0.6 pp
  • PFAS-HIGH 100.0% detect
  • SRC-GW GW lead 96%
  • SYS-LARGE 224 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Calvert County (+ 0.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Carroll County ranks #472 of 3,254 counties by people served, and #8 of 24 counties in Maryland. See methodology · corpus placement.

Carroll County standing, lower-flagged corpus third

Flagged-system rate 82.1% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 47.8% 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 #472 of 3,254 · #8 of 24 in Maryland.

Flagged-rate neighbourhood around Carroll County

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

0% 20% 40% 60% 80% 100% Baltimore city · lowest Carroll · this county Allegany · near Kent · highest 38.5% 81.4% 82.1% 82.7% 83.1% 83.8% 96.6%

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

Water Systems

System Name Population Violations PFAS
City of Westminster 35,256 70 Detected
Freedom District 24,867 81 Detected
Town of Mount Airy 9,890 156 Detected
City of Taneytown 6,750 99 Detected
Town of Hampstead 6,600 21 Detected
Town of Manchester 4,954 140 Detected
Wakefield Valley 2,436 15 -
Town of New Windsor 1,732 21 -
Tevco Jiffy Mart 1,610 2 -
Springfield Hospital Distribution 1,500 104 -
South Carroll High School 1,250 113 -
Dunkin Donuts 1,000 0 -
Town of Union Bridge 997 26 -
Four Seasons Sports Complex 900 4 -
Royal Farms #113 900 0 -
Royal Farms #62 806 2 -
Links at Challedon 800 2 -
Seven-Eleven - Hampstead 800 3 -
Winfield Elementary 700 14 -
Runnymede Elementary 700 8 -
Patapsco State Park ( McKeldin A) 700 0 -
Jiffy Mart Finksburg 700 2 -
Sandymount Elementary 650 13 -
Mechanicsville Elementary 600 14 -
Ramblin Pines Campground 500 8 -
Little Georges (Winfield) 500 7 -
Seven-Eleven -Taylorsville 500 1 -
Fairhaven Park-Sykesville Baseball 500 5 -
B.t.r. Hampstead (Black and Decker) 472 46 -
Gaither Manor Apartments 450 74 -
South Carroll Swim Club 425 10 -
Keymar Convenience Store (Citgo) 410 4 -
Church of Jesus Christ of Lds - Mt Airy 400 4 -
Ruhlman Brewery, LLC 400 0 -
Gerstell Academy 350 0 -
Bullocks Country Family Restaurant 334 2 -
Pheasant Ridge Estates 300 48 -
Gamber & Community Fire Company 300 0 -
Piney Run Park Boat Dock-Lower Comfort 300 8 -
Winfield Inn 300 9 -
Carroll County Sports Complex 300 1 -
Piney Run Park Nature Center 300 6 -
Piney Run Park Tennis Court-Upper Comfor 300 3 -
Seven-Eleven - Finksburg 300 0 -
Highs #23 - Manchester 300 7 -
Finksburg Public Library 265 5 -
River Valley Ranch - Main Ranch/Kitchen 260 1 -
Mudgett Business Center 260 0 -
Hampstead Baptist Church 250 24 -
Buds at Silver Run 250 22 -

Compare beyond Maryland

Lower-flagged peers for Carroll County

Cross-state counties nearest Carroll County on flagged-system share (82.1%) and cumulative violation count (3,560). 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.