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Counties → Maryland

Calvert County, Maryland

SDWIS compliance plate

Sheet MD009 · Calvert County 226 sys · 3,228 viol · #657/3254

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

  • VIOL-SEVERE 82.7% flagged
  • HEALTH-MID 44.5% health
  • RANK-UPPER #657/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 100%
  • SYS-LARGE 226 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Allegany County (+ 0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Calvert County ranks #657 of 3,254 counties by people served, and #12 of 24 counties in Maryland. See methodology · corpus placement.

Calvert County standing, lower-flagged corpus third

Flagged-system rate 82.7% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 44.5% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #657 of 3,254 · #12 of 24 in Maryland.

Flagged-rate neighbourhood around Calvert County

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

0% 20% 40% 60% 80% 100% Baltimore city · lowest Carroll · near 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
Chesapeake Ranch Estates 9,500 11 Clean
Town of Chesapeake Beach 5,000 7 Clean
Prince Frederick 4,371 15 Clean
Solomons 3,811 12 Clean
Town of North Beach 3,000 32 -
Shoppes at Apple Greene 2,818 12 -
Northern Middle & High Schools 2,470 24 -
Chesapeake Church 2,050 12 -
Beaches Water Co-Operative 2,000 35 -
Huntingtown High School 1,540 0 -
Wawa #573 1,516 0 -
7 - Eleven - Prince Frederick 1,500 0 -
Scientists Cliffs 1,425 15 -
Solomons Recreation Center (Navfac-Wash) 1,200 22 -
Chesapeake Heights (Bayside Forest) 1,190 14 -
Summit/Highlands 1,108 4 -
Fastop #54 1,010 22 -
Calvert Country & Calvert Elementary 900 25 -
Mutual Elementary School 894 8 -
Plum Point Middle School 881 29 -
Calvert County Fairground 807 16 -
Southern Middle School 745 22 -
Mt. Harmony Elementary School 706 19 -
Harriet Elizabeth Brown Community Center 700 0 -
Calvert Middle School 675 13 -
Patuxent Elementary School 637 13 -
Plum Point Elementary School 615 9 -
Town Center Amoco 615 17 -
Huntingtown Elementary School 609 18 -
Dash in Owings 606 16 -
Appeal Elementary School 569 9 -
New Life Church 525 3 -
Bowens Grocery 509 0 -
Dollar General Store 509 0 -
Burger King Dunkirk 506 0 -
Emmanuel Baptist Church 504 11 -
7-11 Sunderland 504 0 -
Sunderland Village Center 500 0 -
The Sickle Farm 494 0 -
Calvert Cliffs Nuclear - Protected Area 482 74 -
Sunderland Elementary School 481 24 -
Southern Calvert Baptist Church 480 0 -
Huntingtown Professional Center, LLC 470 36 -
The Calverton School 461 50 -
Cross Point Subdivision 434 3 -
Results Fitness- Owings 408 3 -
Kings Landing Pool 408 0 -
Bethel Way of the Cross - (Newer Bldg) 406 0 -
Cavalier Country 381 3 -
Cardinal Hickey Academy 380 12 -

Compare beyond Maryland

Lower-flagged peers for Calvert County

Cross-state counties nearest Calvert County on flagged-system share (82.7%) and cumulative violation count (3,228). 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.