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County profile · EPA SDWIS + UCMR5

Henry County, Iowa

11 SDWIS-listed public water systems serve 15,922 people in Henry County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.

11
SDWIS water systems Smaller third of counties
798
Total violations Middle third of counties
90.9%
SDWIS systems w/ a violation Lower third of counties
0.0%
UCMR5 PFAS rate (1 tested) Lower third of counties with tests

SDWIS compliance plate

Sheet IA087 · Henry County 11 sys · 798 viol · #1964/3254

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

  • VIOL-SEVERE 90.9% flagged
  • HEALTH-LOW 12.0% health
  • RANK-LOWER #1964/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 82%
  • SYS-SMALL 11 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Henry County ranks #1,964 of 3,254 counties by people served, and #35 of 99 counties in Iowa. See methodology · corpus placement.

Henry County standing, lower-flagged corpus third

Flagged-system rate 90.9% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 12.0% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #1,964 of 3,254 · #35 of 99 in Iowa.

Flagged-rate neighbourhood around Henry County

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

0% 20% 40% 60% 80% 100% Mahaska · lowest Emmet · near Benton · near Ringgold · highest 75% 90.9% 90.9% 91.6% 91.7% 91.7% 100%

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

Water Systems

Compare beyond Iowa

Lower-flagged peers for Henry County

Cross-state counties nearest Henry County on flagged-system share (90.9%) and cumulative violation count (798). 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. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.