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Counties → South Carolina

County profile · EPA SDWIS + UCMR5

Sumter County, South Carolina

24 SDWIS-listed public water systems serve 84,388 people in Sumter County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.

24
SDWIS water systems Middle third of counties
1,103
Total violations Middle third of counties
87.5%
SDWIS systems w/ a violation Lower third of counties
25.0%
UCMR5 PFAS rate (4 tested) Middle third of counties with tests

SDWIS compliance plate

Sheet SC085 · Sumter County 24 sys · 1,103 viol · #652/3254

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

  • VIOL-SEVERE 87.5% flagged
  • HEALTH-LOW 18.7% health
  • RANK-UPPER #652/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-MID 25.0% detect
  • SRC-GW GW lead 100%
  • SYS-SMALL 24 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Anderson County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Sumter County ranks #652 of 3,254 counties by people served, and #17 of 46 counties in South Carolina. See methodology · corpus placement.

Sumter County standing, lower-flagged corpus third

Flagged-system rate 87.5% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 18.7% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 25.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #652 of 3,254 · #17 of 46 in South Carolina.

Flagged-rate neighbourhood around Sumter County

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

0% 20% 40% 60% 80% 100% Horry · lowest Anderson · near Allendale · near Lee · highest 26.4% 87.5% 87.5% 87.5% 87.5% 87.5% 100%

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

Water Systems

System Name Population Violations PFAS
Sumter City of (Sc4310001) 53,070 7 Clean
High Hills Rural Water Co Inc (4320003) 12,545 38 Clean
Shaw Afb (Sc4310501) 5,125 66 Detected
Dalzell Water District (Sc4320001) 3,912 21 Clean
Oswego Rural Water Co (Sc4320006) 3,282 6 -
Sumter Co-Wedgefield-Stateburg WD 1,200 115 -
Bgwc Oakland Plantation (Sc4350006) 1,180 434 -
Mayesville Town of (Sc4310003) 665 12 -
Shiloh Water System (Sc4320005) 645 4 -
Pinewood Town of (Sc4310002) 455 24 -
Sumter-Wessex S/D (Sc4350016) 412 73 -
Bgwc Pocalla Development (Sc4350007) 327 0 -
Hibiscus Homes (Sc4360037) 280 27 -
Crescent MHP (Sc4360011) 259 76 -
Shaw Mobile Home Park (Sc4360012) 173 40 -
Granada Subdivision (Sc4350008) 150 18 -
Goodwill Headstart (Sc4370119) 150 30 -
Poinsett State Park Camp (Sc4370601) 142 17 -
Cedar Hill MHP (Sc4360010) 128 17 -
Camp Burnt Gin (4370675) 120 7 -
Whispering Pines MHP (Sc4360021) 80 48 -
Quail Hollow S/D (Sc4350014) 36 23 -
Primo-Walmart 5383 (4380008) 26 0 -
Primo-Walmart 377 (Sc4380009) 26 0 -

Compare beyond South Carolina

Lower-flagged peers for Sumter County

Cross-state counties nearest Sumter County on flagged-system share (87.5%) and cumulative violation count (1,103). 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. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.