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Counties → Delaware

Sussex County, Delaware

SDWIS compliance plate

Sheet DE005 · Sussex County 251 sys · 4,772 viol · #188/3254

VIOL-SEVERE · HEALTH-HIGH · RANK-TOP · ABOVE-PEER · PFAS-HIGH · SRC-GW · SYS-LARGE · BOOK-FULL

  • VIOL-SEVERE 73.7% flagged
  • HEALTH-HIGH 51.8% health
  • RANK-TOP #188/3254
  • ABOVE-PEER +6.6 pp
  • PFAS-HIGH 57.9% detect
  • SRC-GW GW lead 100%
  • SYS-LARGE 251 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: New Castle County ( -6.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Sussex County ranks #188 of 3,254 counties by people served, and #2 of 3 counties in Delaware. See methodology · corpus placement.

Sussex County standing, lower-flagged corpus third

Flagged-system rate 73.7% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 51.8% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 57.9% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #188 of 3,254 · #2 of 3 in Delaware.

Flagged-rate neighbourhood around Sussex County

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

0% 20% 40% 60% 80% 100% New Castle · lowest Sussex · this county 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
Rehoboth Pump District (Tui) 81,417 9 Detected
Bethany Bay Pump District 51,000 11 Detected
Dewey Beach Water Department 31,000 4 Detected
Rehoboth Beach Water Department 25,000 0 Detected
Artesian Southern Sussex Regional 18,015 11 Detected
Sussex Shores Water Company 12,450 9 Clean
Bethany Beach Water Department 12,000 21 Clean
Long Neck Water Company 11,000 20 Clean
Lewes Board of Public Works 9,627 11 Detected
Millsboro Water Department 8,568 25 Clean
Bayside Pump District (Tui) 8,400 4 Detected
Georgetown Water Department 7,259 2 Detected
Seaford Water Department 6,699 23 Detected
Bridgeville Water Department 6,000 11 Clean
Artesian Northern Sussex Regional 5,511 2 Detected
Laurel Water Department 3,984 14 Clean
Selbyville Water Department 3,502 26 -
Milton Water Department 3,200 20 -
Broadkiln Beach Water Company (Tui) 3,171 28 -
Stockley Regional 2,761 0 -
Delmar Utility Comm (TN of Delmar) 2,027 11 Clean
Sussex Technical School District 1,800 12 -
Swann Keys 1,764 3 Clean
Gulls Way Campground 1,617 26 -
Rehoboth Bay Community 1,575 28 -
Bridgeville Pump District 1,542 5 -
Allen Harim Foods Inc 1,500 10 -
Perdue Foods LLC 1,500 0 -
Trap Pond State Park System 2-Nature Ctr 1,500 0 -
Mallard Lakes 1,500 0 -
Angola Beach Estates 1,400 20 -
Holly Lake Campsites System 2 1,375 9 -
Blades, Town Of 1,200 24 -
Mountaire-Millsboro 1,200 93 -
Trap Pond State Park System 3 - Camping 1,000 4 -
Greenwood Water Department 973 44 -
Dagsboro Water Dept 934 12 -
Laurel Village Mhc 918 21 -
DE-Lux Dairy Market - Seaford 916 30 -
Baywood Greens 909 0 -
Tuckahoe Acres System #2 900 12 -
Holly Lake Campsites System 3 900 9 -
Slaughter Beach PWS 846 4 -
Treasure Beach Campground System 1 786 0 -
Evelyn Morris Elementary School 780 0 -
Treasure Beach Campground System 2 771 0 -
Clearbrooke Estates Pump District 768 1 -
Tuckahoe Acres System #1 750 43 -
Stockley Center 749 18 -
Treasure Beach Campground System 4 699 5 -

Compare beyond Delaware

Lower-flagged peers for Sussex County

Cross-state counties nearest Sussex County on flagged-system share (73.7%) and cumulative violation count (4,772). 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.