PlainWater

Mercer County, West Virginia

SDWIS compliance plate

Sheet WV055 · Mercer County 13 sys · 18,223 viol · #1317/3254

VIOL-SEVERE · HEALTH-LOW · RANK-MID · BELOW-PEER · PFAS-MID · SRC-GW · SYS-SMALL · BOOK-FULL

  • VIOL-SEVERE 92.3% flagged
  • HEALTH-LOW 2.3% health
  • RANK-MID #1317/3254
  • BELOW-PEER 2.1 pp cleaner
  • PFAS-MID 25.0% detect
  • SRC-GW GW lead 54%
  • SYS-SMALL 13 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Raleigh County (+ 2.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Mercer County ranks #1,317 of 3,254 counties by people served, and #16 of 55 counties in West Virginia. See methodology · corpus placement.

Mercer County standing, lower-flagged corpus third

Flagged-system rate 92.3% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 2.3% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 25.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #1,317 of 3,254 · #16 of 55 in West Virginia.

Flagged-rate neighbourhood around Mercer County

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

0% 20% 40% 60% 80% 100% Mercer · this county · lowest Berkeley · near Boone · highest 92.3% 94.4% 95.7% 97.7% 100% 100%

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

Water Systems

Compare beyond West Virginia

Lower-flagged peers for Mercer County

Cross-state counties nearest Mercer County on flagged-system share (92.3%) and cumulative violation count (18,223). 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.