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Counties → Delaware

New Castle County, Delaware

SDWIS compliance plate

Sheet DE003 · New Castle County 76 sys · 1,173 viol · #129/3254

VIOL-SEVERE · HEALTH-HIGH · RANK-TOP · BELOW-PEER · PFAS-HIGH · SRC-GW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 67.1% flagged
  • HEALTH-HIGH 49.2% health
  • RANK-TOP #129/3254
  • BELOW-PEER 6.6 pp cleaner
  • PFAS-HIGH 62.5% detect
  • SRC-GW GW lead 93%
  • SYS-MID 76 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Sussex County (+ 6.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, New Castle County ranks #129 of 3,254 counties by people served, and #1 of 3 counties in Delaware. See methodology · corpus placement.

New Castle County standing, lower-flagged corpus third

Flagged-system rate 67.1% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 49.2% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 62.5% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #129 of 3,254 · #1 of 3 in Delaware.

Flagged-rate neighbourhood around New Castle County

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

0% 20% 40% 60% 80% 100% New Castle · this county · lowest Kent · highest 67.1% 73.7% 81.2%

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

Water Systems

System Name Population Violations PFAS
Artesian Water Company 231,114 31 Detected
Wilmington Water Department 107,976 30 Detected
Veolia Water Delaware, Inc 100,495 46 Detected
Newark Water Department 40,000 42 Detected
Middletown Water Department 17,700 26 Clean
Municipal Services Commission 5,549 5 Detected
East Ncc District 5,538 4 Clean
North West Pump District 4,149 7 Clean
Willow Grove Mill 3,090 0 -
Delaware City Water Department (Awc) 2,610 4 -
Delaware Correctional Center 2,000 18 -
Wilmington Vamc 1,695 0 -
Siemens Healthcare Diagnostics 1,500 10 -
Parkside 1,467 0 -
Greenville Country Club 1,200 28 -
South East Pump District 936 4 -
Dove Run 909 0 -
Dove Run Shopping Center 855 0 -
Villagebrook 847 0 -
Shore Stop #227 Townsend 800 33 -
Delaware Museum of Natural History 700 15 -
Fort Delaware State Park 700 32 -
Winterthur 687 7 -
Hunters Run 683 0 -
Kingsmill 381 0 -
Brick Mill Early Childhood Center 360 0 -
St Andrews Apartments 360 0 -
Ascot Landing Subdivision 338 0 -
301 Plaza 300 3 -
St Andrews Apartment New Addition 272 0 -
Summit Village Shopping Center 250 0 -
Helens Sausage House 250 0 -
Vic Mead Hunt Club 250 19 -
Glasgow Pines II 235 0 -
Meridian Crossing Apartments 220 0 -
Ponds of Odessa (Awc) 216 2 -
Bayview Improvement Company (Awc) 214 7 -
Frederick Lodge Pump District 204 6 -
St Andrews School I 200 20 -
Brandywine Creek State Park 200 32 -
Ashland Nature Center System #1 200 13 -
Emergency Operations Center 200 11 -
Shoppes of Mt Pleasant 200 20 -
Drawyers Creek Pump District 192 8 -
Summit Pond Pump District 177 9 -
Bidermann Golf Course 175 29 -
Centreville Layton School System I 170 46 -
Country Center Girl Scout Camp 165 4 -
Buckleys Tavern Complex 150 9 -
St Andrews School II 140 32 -

Compare beyond Delaware

Lower-flagged peers for New Castle County

Cross-state counties nearest New Castle County on flagged-system share (67.1%) and cumulative violation count (1,173). 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.