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Counties → Ohio

Montgomery County, Ohio

SDWIS compliance plate

Sheet OH113 · Montgomery County 74 sys · 4,724 viol · #133/3254

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

  • VIOL-SEVERE 91.9% flagged
  • HEALTH-MID 22.7% health
  • RANK-TOP #133/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-HIGH 62.5% detect
  • SRC-GW GW lead 76%
  • SYS-MID 74 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Defiance County (+ 0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Montgomery County ranks #133 of 3,254 counties by people served, and #4 of 88 counties in Ohio. See methodology · corpus placement.

Montgomery County standing, lower-flagged corpus third

Flagged-system rate 91.9% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 22.7% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 62.5% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #133 of 3,254 · #4 of 88 in Ohio.

Flagged-rate neighbourhood around Montgomery County

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

0% 20% 40% 60% 80% 100% Fayette · lowest Jefferson · near Montgomery · this county Vinton · highest 78.6% 91.3% 91.4% 91.4% 91.9% 92% 100%

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

Water Systems

System Name Population Violations PFAS
Montgomery County Water Services 1 PWS 150,207 33 Detected
Dayton Public Water System 141,407 46 Detected
Montgomery County Water Services 2 PWS 83,033 32 Detected
Huber Heights Public Water System 43,439 39 Clean
Miamisburg City PWS 19,790 8 Clean
Englewood City PWS 13,463 12 Clean
West Carrollton City PWS 12,910 7 Clean
Oakwood City PWS 9,572 2 Detected
Trotwood City PWS 9,000 58 Detected
Union City PWS 7,000 35 Detected
Brookville Municipality PWS 5,923 54 Detected
Germantown City PWS 5,796 371 Clean
Jefferson Regional Water Authority 4,750 190 Detected
New Lebanon Village PWS 3,995 48 Clean
Kettering Health Main Campus 3,946 4 -
Dayton Vamc Water Treatment Plant-Bld330 3,216 12 -
Grandview Medical Center PWS 1,850 8 Detected
Oakwood Village MHP 1,500 23 -
Farmersville Village PWS 1,009 84 -
Kettering Health Miamisburg 702 8 -
Kettering Health Washington Twp 596 8 -
Phillipsburg Village PWS 490 83 -
Miami Valley Hospital Main PWS 404 0 -
Voyager Village MHP 400 222 -
The Ridge Church 400 7 -
Farmersville/Jackson Twp Rec Comm Ctr 250 28 -
Brookville Lake Estates 211 159 -
Aullwood Audubon Nature Center PWS 200 86 -
Rip Rap Roadhouse PWS 200 130 -
Melody 49 Drive-IN 180 43 -
Lake of the Woods 3 Clubhouse 160 44 -
Brantwood Baptist Church PWS 150 48 -
Ignited Church 150 16 -
Canopy Creek Farm LLC PWS 150 0 -
Buckhorn Tavern 145 40 -
Quarry Lakes MHP LLC 141 105 -
United Christian Church PWS 130 51 -
Salem Church of the Brethren PWS 125 89 -
Fair Valley Country Club 125 115 -
Dayton VA Bldg 410 125 11 Detected
Dayton KOA Holiday PWS 100 13 -
Plainview Open Bible Church 100 147 -
First Grace Brethren Church 100 159 -
Spitfire 100 38 -
Clayton Park (Hardscrabble Ball Park) 100 41 -
Germantown Metropark Nature Center 100 100 -
Melody Pool 100 48 -
Nnck Marathon 100 150 -
Dayton VA Bldg 320 Pod A 95 15 -
Dayton VA Bldg 320 Pod C 85 12 -

Compare beyond Ohio

Lower-flagged peers for Montgomery County

Cross-state counties nearest Montgomery County on flagged-system share (91.9%) and cumulative violation count (4,724). 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. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.