PlainWater

Chester County, South Carolina

SDWIS compliance plate

Sheet SC023 · Chester County 19 sys · 250 viol · #1920/3254

VIOL-HIGH · HEALTH-HIGH · RANK-MID · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-SMALL · BOOK-FULL

  • VIOL-HIGH 52.6% flagged
  • HEALTH-HIGH 53.6% health
  • RANK-MID #1920/3254
  • PHOTO-FINISH ±0.7 pp
  • PFAS-HIGH 100.0% detect
  • SRC-GW GW lead 89%
  • SYS-SMALL 19 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Beaufort County (+ 0.7 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Chester County ranks #1,920 of 3,254 counties by people served, and #36 of 46 counties in South Carolina. See methodology · corpus placement.

Chester County standing, lower-flagged corpus third

Flagged-system rate 52.6% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 53.6% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 100.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #1,920 of 3,254 · #36 of 46 in South Carolina.

Flagged-rate neighbourhood around Chester County

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

0% 20% 40% 60% 80% 100% Horry · lowest Beaufort · near Charleston · near Lee · highest 26.4% 52.6% 53.3% 53.6% 54.1% 54.2% 100%

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

Water Systems

Compare beyond South Carolina

Lower-flagged peers for Chester County

Cross-state counties nearest Chester County on flagged-system share (52.6%) and cumulative violation count (250). 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
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.