County profile · EPA SDWIS + UCMR5
Day County, South Dakota
6 SDWIS-listed public water systems serve 2,815 people in Day County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.
- 6
- SDWIS water systems Smaller third of counties
- 432
- Total violations Lower third of counties
- 100.0%
- SDWIS systems w/ a violation Middle third of counties
- -
- UCMR5 PFAS (none tested) No UCMR5 tests
SDWIS compliance plate
Sheet SD037 · Day County 6 sys · 432 viol · #2994/3254
VIOL-SEVERE · HEALTH-LOW · RANK-BOTTOM · PHOTO-FINISH · PFAS-NONE · SRC-SW · SYS-TINY · BOOK-MOST
- VIOL-SEVERE 100.0% flagged
- HEALTH-LOW 6.7% health
- RANK-BOTTOM #2994/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-NONE No UCMR5 set
- SRC-SW SW lead 67%
- SYS-TINY 6 systems
- BOOK-MOST 6/7 fields
Nearest flagged-rate peer: Brown County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Day County ranks #2,994 of 3,254 counties by people served, and #39 of 65 counties in South Dakota. See methodology · corpus placement.
Day County standing, mid-flagged corpus third
Flagged-system rate 100.0% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 6.7% is health-based share at or below the lower third (≤ 10.3%) . No UCMR5 tests in this extract for Day County . Population served ranks #2,994 of 3,254 · #39 of 65 in South Dakota.
Flagged-rate neighbourhood around Day County
Lowest/highest poles plus in-state counties nearest Day County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
Compare beyond South Dakota
Mid-flagged peers for Day County
Cross-state counties nearest Day County on flagged-system share (100.0%) and cumulative violation count (432). 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.
Similar violation load
Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).
Read our methodology · Check your water system - how this data is sourced, computed, and verified.
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.