PlainWater

Union County, South Carolina

SDWIS compliance plate

Sheet SC087 · Union County 9 sys · 356 viol · #1350/3254

VIOL-SEVERE · HEALTH-HIGH · RANK-MID · ABOVE-PEER · PFAS-HIGH · SRC-SW · SYS-TINY · BOOK-FULL

  • VIOL-SEVERE 88.9% flagged
  • HEALTH-HIGH 69.1% health
  • RANK-MID #1350/3254
  • ABOVE-PEER +1.4 pp
  • PFAS-HIGH 100.0% detect
  • SRC-SW SW lead 100%
  • SYS-TINY 9 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Anderson County ( -1.4 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Union County ranks #1,350 of 3,254 counties by people served, and #27 of 46 counties in South Carolina. See methodology · corpus placement.

Union County standing, lower-flagged corpus third

Flagged-system rate 88.9% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 69.1% 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 #1,350 of 3,254 · #27 of 46 in South Carolina.

Flagged-rate neighbourhood around Union County

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

0% 20% 40% 60% 80% 100% Horry · lowest Sumter · near Allendale · near Lee · highest 26.4% 87.5% 87.5% 87.5% 87.5% 88.9% 100%

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

Water Systems

Compare beyond South Carolina

Lower-flagged peers for Union County

Cross-state counties nearest Union County on flagged-system share (88.9%) and cumulative violation count (356). 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.