PlainWater
Counties → Montana

Sanders County, Montana

SDWIS compliance plate

Sheet MT089 · Sanders County 44 sys · 3,111 viol · #2424/3254

VIOL-SEVERE · HEALTH-LOW · RANK-LOWER · PHOTO-FINISH · PFAS-NONE · SRC-GW · SYS-MID · BOOK-MOST

  • VIOL-SEVERE 88.6% flagged
  • HEALTH-LOW 14.8% health
  • RANK-LOWER #2424/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-NONE No UCMR5 set
  • SRC-GW GW lead 100%
  • SYS-MID 44 systems
  • BOOK-MOST 6/7 fields

Nearest flagged-rate peer: Glacier County (+ 0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Sanders County ranks #2,424 of 3,254 counties by people served, and #24 of 56 counties in Montana. See methodology · corpus placement.

Sanders County standing, lower-flagged corpus third

Flagged-system rate 88.6% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 14.8% is health-based share in the middle third (≤ 24.5%) . No UCMR5 tests in this extract for Sanders County . Population served ranks #2,424 of 3,254 · #24 of 56 in Montana.

Flagged-rate neighbourhood around Sanders County

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

0% 20% 40% 60% 80% 100% Powder River · lowest Sanders · this county Toole · near Petroleum · highest 66.7% 87.5% 88.6% 88.9% 88.9% 91.3% 100%

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

Water Systems

System Name Population Violations PFAS
Thompson Falls City Of 1,950 38 -
Plains Town Of 1,700 373 -
Hot Springs Municipal Water 600 118 -
One Stop 500 237 -
Sanders County Harvest Foods 445 284 -
Water Service Inc Trout Creek 350 25 -
Noxon Water District 330 17 -
Aitkens Quik Stop Noxon 306 34 -
Thompson Falls Dollar General 303 0 -
Rimrock Lodge 223 114 -
Salish Shores Trade Winds Comm Village 215 102 -
Paradise Water District 200 57 -
Quinns Hot Springs Resort 155 93 -
Camp Bighorn 146 78 -
Cabinet Ranger Station 145 21 -
Cabinet Mountain Bible Church 140 0 -
Woodside Park County Water and Sewer Dis 115 39 -
Thompson Falls Family Dollar Store 108 0 -
Lds Church Plains 100 41 -
Heron Community Water System 84 304 -
Crescent Village Property Owners Associa 80 36 -
Clear View Academy 70 24 -
North Shore Estates HOA 65 124 -
Two Rivers RV Park 62 50 -
Silver Tip Junction 62 41 -
Birdland Bay RV Resort 60 18 -
Symes Hotel 54 26 -
Riverfront Motel 53 47 -
Thompson Falls Golf Course 52 92 -
Second Home Restaurant 51 8 -
Crown Passage Northwest LLC Boys 51 74 -
Hereford Bar and Grill 47 82 -
Avista Utilities Noxon Rapids Dam 43 17 -
Crown Passage Northwest LLC Girls 43 114 -
Thompson Falls Mt State Park 42 6 -
Jehovahs Witnesses Noxon Kingdom Hall 35 11 -
Clear View Horizon Academy Unapproved 32 154 -
Deemer Creek Business Park 31 6 -
Wild Coyote Saloon 31 64 -
Bear Creek Resort 29 14 -
Plains Alliance Church 27 85 -
Tammaro Water Bottling 27 0 -
Plains Physical Therapy Clinic 25 43 -
Beagles Bakery & Espresso 25 0 -

Compare beyond Montana

Lower-flagged peers for Sanders County

Cross-state counties nearest Sanders County on flagged-system share (88.6%) and cumulative violation count (3,111). 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.