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Counties → Montana

Cascade County, Montana

SDWIS compliance plate

Sheet MT013 · Cascade County 98 sys · 15,613 viol · #593/3254

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

  • VIOL-SEVERE 91.8% flagged
  • HEALTH-LOW 6.6% health
  • RANK-TOP #593/3254
  • PHOTO-FINISH ±0.2 pp
  • PFAS-MID 25.0% detect
  • SRC-GW GW lead 52%
  • SYS-MID 98 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Pondera County ( -0.2 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Cascade County ranks #593 of 3,254 counties by people served, and #5 of 56 counties in Montana. See methodology · corpus placement.

Cascade County standing, lower-flagged corpus third

Flagged-system rate 91.8% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 6.6% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 25.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #593 of 3,254 · #5 of 56 in Montana.

Flagged-rate neighbourhood around Cascade County

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

0% 20% 40% 60% 80% 100% Powder River · lowest Chouteau · near Cascade · this county Petroleum · highest 66.7% 91.7% 91.7% 91.7% 91.8% 92.3% 100%

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

Water Systems

System Name Population Violations PFAS
Great Falls City Of 60,000 26 Clean
Malmstrom Air Force Base 8,850 82 Detected
Source Giant Springs Inc 3,007 18 -
Montana Expo Park Cascade County 2,510 25 -
Sun Prairie Village County 1,800 581 Clean
University of Providence 1,472 37 -
Black Eagle Cascade County Water Sewer 1,233 31 -
Giant Springs State Park 1,011 27 -
Prairie Water Company 1,000 91 -
Culligan Water Conditioning Great Falls 900 22 Clean
Town Pump Gore Hill 760 145 -
Cascade Town Of 650 18 -
Belt Town Of 600 169 -
Countryside Village MHP Grt Fls 600 4 -
Vaughn Cascade County Water and Sewer 585 57 -
Two Buttes Water Users Assn 525 119 -
Missouri River Bar and Grill 512 162 -
Armington Jct Belt Rest Stop 510 62 -
Gore Hill County Water Dist 500 332 -
Homestead Acres County Water and Sewer 500 55 -
Bushard Water Company 425 18 -
Mountain View Co-Op Ulm 421 56 -
Highwood Mobile Home Park 400 32 -
Sun Prairie Water District 350 94 -
Mt Air Natl Guard 120th Air Lift Wing 350 0 -
Frontier Inn 300 17 -
Centerville School 292 140 -
Great Falls KOA Kampground 287 564 -
Great Falls RV Park 274 0 -
Ryan Dam Water System 230 189 -
Neihart Town Of 229 376 -
Headquarters Building Region 4 220 18 -
Stockett Water and Sewer Dist 210 338 -
South Wind Water and Sewer District 200 356 -
Tracy Water Users Corp 200 439 -
Lds Church Sun River 200 68 -
Sand Coulee Water Users District 180 1,072 -
Simms High School 180 901 -
Grandview Trailer Court 165 4 -
Heritage Baptist Church 151 109 -
Big Stone Colony Inc 130 8 -
Pleasant Park Community Inc 125 1,791 -
Beef N Bone Steakhouse 123 33 -
Pleasant Valley Colony 120 25 -
Cascade Colony 105 16 -
Fairhaven Colony 105 47 -
First Peoples Buffalo Jump State Park 105 20 -
Tri Hil Wua Gore Hill 100 870 -
Big Bend Ranch Subdivision 100 529 -
Shade Tree Mobile Park 100 7 -

Compare beyond Montana

Lower-flagged peers for Cascade County

Cross-state counties nearest Cascade County on flagged-system share (91.8%) and cumulative violation count (15,613). 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.