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Counties → New York

Ontario County, New York

SDWIS compliance plate

Sheet NY069 · Ontario County 53 sys · 3,446 viol · #609/3254

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

  • VIOL-SEVERE 98.1% flagged
  • HEALTH-LOW 8.7% health
  • RANK-TOP #609/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-LOW 10.0% detect
  • SRC-SW SW lead 57%
  • SYS-MID 53 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Montgomery County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Ontario County ranks #609 of 3,254 counties by people served, and #28 of 58 counties in New York. See methodology · corpus placement.

Ontario County standing, mid-flagged corpus third

Flagged-system rate 98.1% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 8.7% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 10.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #609 of 3,254 · #28 of 58 in New York.

Flagged-rate neighbourhood around Ontario County

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

0% 20% 40% 60% 80% 100% Niagara · lowest Orange · near Ontario · this county Cortland · highest 38.1% 98% 98% 98% 98.1% 98.1% 100%

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

Water Systems

System Name Population Violations PFAS
Geneva City 13,334 75 Clean
Canandaigua-Farmington Consolidated W.D. 13,000 29 Clean
Canandaigua City 11,264 98 Clean
McWa - Geneva 8,532 8 -
Canandaigua Town Cons. WD 6,607 27 Clean
Hopewell Cons WD 1 3,781 7 Clean
Gorham Town WD 3,420 172 Clean
Geneva WD #2 CSA 2,680 4 Clean
Seneca Town WD 2,625 10 -
Victor Village 2,443 43 -
Rushville Village 2,341 35 -
Clifton Springs Village 2,190 3 -
Phelps Town Consolidated WD 2,175 26 Clean
Phelps Village 2,118 17 -
Bloomfield Village Consolidated 1,814 55 -
Manchester Village 1,709 36 -
Hopewell Consolidated WD #2 1,615 22 -
Shortsville Village 1,320 57 -
J Warren Cutler Scout Reservation 1,300 33 -
Naples Consolidated 1,250 204 -
Canadice Wd1 1,067 0 -
Manchester Central WD 1,000 37 -
Bristol Harbour Water Corp 835 129 Detected
Port Gibson WD 475 26 -
Hunt Hollow Dev. Corp 400 130 -
Geneva WD #8 400 5 -
Phelps Route 14 WD 400 5 -
Bristol Mountain Water Works 318 322 -
East Bloomfield WD #2 302 58 -
Bristol Woodlands Campground 250 71 -
Bristol WD #1 203 57 Clean
The Ritz 156 56 -
The Sawmill 150 114 -
Country Side Park 125 159 -
Country Colony Estates 125 25 -
Cheerful Valley Campground 108 57 -
Winged Pheasant Golf Club 100 270 -
Arbor Hill Associates 100 53 -
Bristol Valley Homes 90 79 -
Ontario County Park 90 65 -
Elderlee, Inc. - Steel Plant 87 6 -
Parkview Fairways Golf Course 80 58 -
Flcc Muller Station 80 54 -
Riverside Park 56 119 -
Grape Country Estates 51 81 -
Honeoye Fish & Game Club 50 147 -
4-H Camp Bristol Hills 50 88 -
Monicas Pies 50 46 -
Geneva WD #13 40 2 -
Hidden Hollow 32 60 -

Compare beyond New York

Mid-flagged peers for Ontario County

Cross-state counties nearest Ontario County on flagged-system share (98.1%) and cumulative violation count (3,446). 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.