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Counties → Ohio

County profile · EPA SDWIS + UCMR5

Hamilton County, Ohio

28 SDWIS-listed public water systems serve 842,267 people in Hamilton County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.

28
SDWIS water systems Middle third of counties
1,480
Total violations Middle third of counties
82.1%
SDWIS systems w/ a violation Lower third of counties
44.4%
UCMR5 PFAS rate (9 tested) Upper third of counties with tests

SDWIS compliance plate

Sheet OH061 · Hamilton County 28 sys · 1,480 viol · #73/3254

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

  • VIOL-SEVERE 82.1% flagged
  • HEALTH-LOW 9.5% health
  • RANK-TOP #73/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-MID 44.4% detect
  • SRC-GW GW lead 68%
  • SYS-SMALL 28 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Butler County ( -0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Hamilton County ranks #73 of 3,254 counties by people served, and #3 of 88 counties in Ohio. See methodology · corpus placement.

Hamilton County standing, lower-flagged corpus third

Flagged-system rate 82.1% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 9.5% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 44.4% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #73 of 3,254 · #3 of 88 in Ohio.

Flagged-rate neighbourhood around Hamilton County

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

0% 20% 40% 60% 80% 100% Fayette · lowest Marion · near Paulding · near Vinton · highest 78.6% 81.8% 81.8% 82.1% 82.8% 83.3% 100%

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

Water Systems

System Name Population Violations PFAS
Cincinnati Public Water System 750,200 0 Detected
Norwood City PWS 19,870 26 Clean
Indian Hill City PWS 15,000 29 Detected
Harrison City PWS 11,600 70 Clean
Wyoming City PWS 9,700 13 Clean
Reading City PWS 9,506 54 Detected
Cleves Village PWS 6,000 15 Clean
Cincinnati VA Medical Center 4,152 0 -
Trihealth Good Samaritan Hospital 4,000 0 -
Lockland Village PWS 3,486 45 Clean
Glendale Village PWS 2,500 32 -
Cincinnati Childrens Hosp Ionization Sys 1,514 1 Detected
Addyston Village PWS 900 240 -
Cincinnati Childrens Med Center Col Hill 722 0 -
Four Seasons Marina 615 8 -
Uc Health Medical Center Scis 558 1 -
Cincinnati Incorporated 278 42 -
The Root Beer Stand 270 35 -
Twin Rivers Water Corporation 245 84 -
Dry Fork Pointe MHP 230 539 -
Uc Health Ridgeway Tower 208 0 -
Indian Hill Winter Club PWS 200 16 -
Blue Bell Beach PWS 123 112 -
Whitewater Processing, LLC 120 59 -
Taylor Creek Youth Org. PWS 100 38 -
Robins Nest Golf Course PWS 100 7 -
Whitewater Senior Center PWS 45 11 -
Carolaura Farm, Ltd PWS 25 3 -

Compare beyond Ohio

Lower-flagged peers for Hamilton County

Cross-state counties nearest Hamilton County on flagged-system share (82.1%) and cumulative violation count (1,480). 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

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

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.