County profile · EPA SDWIS + UCMR5
Calhoun County, Michigan
148 SDWIS-listed public water systems serve 94,845 people in Calhoun County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.
- 148
- SDWIS water systems Larger third of counties
- 3,433
- Total violations Upper third of counties
- 87.8%
- SDWIS systems w/ a violation Lower third of counties
- 40.0%
- UCMR5 PFAS rate (5 tested) Upper third of counties with tests
SDWIS compliance plate
Sheet MI025 · Calhoun County 148 sys · 3,433 viol · #602/3254
VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-MID · SRC-GW · SYS-LARGE · BOOK-FULL
- VIOL-SEVERE 87.8% flagged
- HEALTH-LOW 8.1% health
- RANK-TOP #602/3254
- PHOTO-FINISH ±0.4 pp
- PFAS-MID 40.0% detect
- SRC-GW GW lead 100%
- SYS-LARGE 148 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Allegan County ( -0.4 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Calhoun County ranks #602 of 3,254 counties by people served, and #19 of 83 counties in Michigan. See methodology · corpus placement.
Calhoun County standing, lower-flagged corpus third
Flagged-system rate 87.8% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 8.1% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 40.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #602 of 3,254 · #19 of 83 in Michigan.
Flagged-rate neighbourhood around Calhoun County
Lowest/highest poles plus in-state counties nearest Calhoun County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
Compare beyond Michigan
Lower-flagged peers for Calhoun County
Cross-state counties nearest Calhoun County on flagged-system share (87.8%) and cumulative violation count (3,433). 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.