County profile · EPA SDWIS + UCMR5
Marion County, Ohio
33 SDWIS-listed public water systems serve 52,490 people in Marion County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.
- 33
- SDWIS water systems Middle third of counties
- 1,445
- Total violations Middle third of counties
- 81.8%
- 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 OH101 · Marion County 33 sys · 1,445 viol · #925/3254
VIOL-SEVERE · HEALTH-LOW · RANK-UPPER · PHOTO-FINISH · PFAS-CLEAN · SRC-GW · SYS-SMALL · BOOK-FULL
- VIOL-SEVERE 81.8% flagged
- HEALTH-LOW 19.8% health
- RANK-UPPER #925/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-CLEAN 0.0% detect
- SRC-GW GW lead 97%
- SYS-SMALL 33 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Butler County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Marion County ranks #925 of 3,254 counties by people served, and #42 of 88 counties in Ohio. See methodology · corpus placement.
Marion County standing, lower-flagged corpus third
Flagged-system rate 81.8% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 19.8% 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 #925 of 3,254 · #42 of 88 in Ohio.
Flagged-rate neighbourhood around Marion County
Lowest/highest poles plus in-state counties nearest Marion County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
Compare beyond Ohio
Lower-flagged peers for Marion County
Cross-state counties nearest Marion County on flagged-system share (81.8%) and cumulative violation count (1,445). 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.