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Counties → Montana

Lake County, Montana

SDWIS compliance plate

Sheet MT047 · Lake County 91 sys · 7,834 viol · #1777/3254

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

  • VIOL-SEVERE 95.6% flagged
  • HEALTH-LOW 12.8% health
  • RANK-MID #1777/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 95%
  • SYS-MID 91 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Lake County ranks #1,777 of 3,254 counties by people served, and #9 of 56 counties in Montana. See methodology · corpus placement.

Lake County standing, mid-flagged corpus third

Flagged-system rate 95.6% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 12.8% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #1,777 of 3,254 · #9 of 56 in Montana.

Flagged-rate neighbourhood around Lake County

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

0% 20% 40% 60% 80% 100% Powder River · lowest Missoula · near Lake · this county Petroleum · highest 66.7% 95% 95.1% 95.2% 95.6% 95.7% 100%

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

Water Systems

System Name Population Violations PFAS
Polson City Of 5,300 242 Clean
Ronan City Of 2,483 259 -
Pablo Lake County Water and Sewer Dist 2,175 69 -
St Ignatius Town Of 700 168 -
Woods Bay Water and Sewer District 685 106 -
Wilson Foods 600 101 -
Consolidated Charlo Lake Co W and S Dist 450 179 -
Round Butte Water Company 400 38 -
Jette Meadows Lake Co W and S Dist 375 157 -
Jette Lake Landowners Association 295 35 -
Ridgewood Estates 250 366 -
Mission Meadows RV Campsite Park, Inc. 200 67 -
Sitting Duck 200 107 -
Rocky Mountain Twist 195 80 -
Ivanhoe Water Inc 178 208 -
Arlee Junior High School 175 236 -
Aunties Emporium 160 88 -
Camp Tuffit LLC 151 27 -
Arlee Elementary School 150 235 -
Swan Lake Annex Campground 150 13 -
Arlee High School Dist No 8 145 339 -
Outback Montana RV Park 130 32 -
Finley Point Mt State Park 120 13 -
Mission Mountain Lake Co W and S Dist 118 14 -
Finley Point Grill 112 26 -
Mountain Lake Lodge 110 35 -
Montana Bonfire, LLC 107 54 -
N8v Grown 103 76 -
Raven Bar 100 68 -
East Shore Smoke House 100 62 -
Safeway No 1646 100 8 -
Rollins Restaurant RV Park 97 46 -
Paradise Pines 95 35 -
Clearview Heights Water Assn 90 200 -
Paradise Cove 89 78 -
Flathead Lake United Methodist Camp 86 64 -
Flathead River RV Resort 84 198 -
Designs for Health Inc 82 49 -
Ninepipes Lodge LLC 80 51 -
Mission Mountain View HOA 80 139 -
Woods Bay Marina 79 59 -
A Bar 77 179 -
The Chuck Wagon Bar & Grill LLC 77 189 -
Big Arm Flathead Lake Mt St Pk 75 61 -
Atanaha Event Center 74 30 -
Bison Inn Cafe 73 246 -
Stutzmans Country Market 72 51 -
Point Service Corporation 70 19 -
Mission Valley United Methodist Church 70 20 -
Meadow Brook Christian Fellowship Church 70 3 -

Compare beyond Montana

Mid-flagged peers for Lake County

Cross-state counties nearest Lake County on flagged-system share (95.6%) and cumulative violation count (7,834). 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.