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Counties → Florida

Seminole County, Florida

SDWIS compliance plate

Sheet FL117 · Seminole County 60 sys · 3,348 viol · #138/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-MID · SRC-GW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 98.3% flagged
  • HEALTH-LOW 9.0% health
  • RANK-TOP #138/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-MID 40.0% detect
  • SRC-GW GW lead 100%
  • SYS-MID 60 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Seminole County ranks #138 of 3,254 counties by people served, and #12 of 67 counties in Florida. See methodology · corpus placement.

Seminole County standing, mid-flagged corpus third

Flagged-system rate 98.3% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 9.0% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 40.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #138 of 3,254 · #12 of 67 in Florida.

Flagged-rate neighbourhood around Seminole County

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

0% 20% 40% 60% 80% 100% Dixie · lowest Polk · near Pasco · near Monroe · highest 66.7% 98.3% 98.3% 98.4% 98.6% 98.7% 100%

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

Water Systems

System Name Population Violations PFAS
Sanford, City of (2 Wps) 79,715 107 Detected
Seminole County Southeast 70,040 73 Clean
Casselberry, City of (3 Wps) 54,747 107 Detected
Altamonte Springs Water Dept (2 Wps) 51,000 64 Detected
Oviedo, City Of 47,933 58 Clean
Sanlando (3 Wtps) 36,953 72 Clean
Winter Springs, City of (3 Wps) 34,657 119 Detected
Seminole County Northwest 31,986 42 Clean
Longwood, City of (2 Wps) 23,237 88 Clean
Seminole County Northeast 19,925 55 Clean
Lake Mary, City Of 17,066 72 Detected
Seminole County Southwest 9,622 66 Clean
Weathersfield 4,221 38 Clean
Chase Groves(consec.) 4,052 9 Detected
Chuluota Water System 3,863 125 Clean
Apple Valley (Consec) 3,269 39 -
Ravenna Park 2,105 25 -
Meredith Manor (Consec.) 1,748 33 -
Midway-Canaan Water Association (Consec) 1,500 35 -
Palm Valley Mobile Home Park 1,476 81 -
Sunshadow Apartments (Consec) 986 8 -
Mullett Lake Water Association 976 89 -
Jansen S/D 868 30 -
Druid Hills (Consec.) 821 34 -
Oakland Shores 788 35 -
Black Hammock -Msbu(consec) 781 12 -
Seminole Woods 780 40 -
Bear Lake Manor 777 28 -
Lake Harney Water Association 700 133 -
Oviedo Marketplace (Consec.) 689 5 -
Geneva Elementary School 670 36 -
Twelve Oaks R.v.resort 500 38 -
Park Ridge 246 33 -
Little Wekiva Estates 214 24 -
Lake Brantley (Consec) 192 28 -
Double R School 160 51 -
Harmony Homes 158 35 -
Lake Mary MHP 150 146 -
Dovera (Consec.) 96 10 -
Orlando Freightliner 75 16 -
Elder Springs Mobile Home Park 62 728 -
Black Hammock Restaurant 25 17 -
True Life Church 25 50 -
Rightway Fuels 25 96 -
Circle K #9746 25 18 -
Speedy Food Mart 25 14 -
Circle K #2655 25 6 -
Forest City Center 25 33 -
Quick Serv Convenience Store 25 13 -
First Baptist Church of Geneva 25 30 -

Compare beyond Florida

Mid-flagged peers for Seminole County

Cross-state counties nearest Seminole County on flagged-system share (98.3%) and cumulative violation count (3,348). 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.