Big Horn County, Montana
SDWIS compliance plate
Sheet MT003 · Big Horn County 23 sys · 6,556 viol · #2326/3254
VIOL-SEVERE · HEALTH-LOW · RANK-LOWER · PHOTO-FINISH · PFAS-CLEAN · SRC-GW · SYS-SMALL · BOOK-FULL
- VIOL-SEVERE 95.7% flagged
- HEALTH-LOW 3.1% health
- RANK-LOWER #2326/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-CLEAN 0.0% detect
- SRC-GW GW lead 65%
- SYS-SMALL 23 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Lake County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Big Horn County ranks #2,326 of 3,254 counties by people served, and #19 of 56 counties in Montana. See methodology · corpus placement.
Big Horn County standing, mid-flagged corpus third
Flagged-system rate 95.7% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 3.1% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #2,326 of 3,254 · #19 of 56 in Montana.
Flagged-rate neighbourhood around Big Horn County
Lowest/highest poles plus in-state counties nearest Big Horn County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| Hardin City Of | 3,500 | 63 | Clean |
| Little Bighorn Battlefield NM | 2,020 | 42 | - |
| Hardin Eastbound Rest Area | 877 | 112 | - |
| Hardin Westbound Rest Area | 715 | 33 | - |
| Lodge Grass Town Of | 480 | 1,445 | - |
| Fort Smith Water and Sewer District | 450 | 830 | - |
| Tongue River Campers Point | 305 | 23 | - |
| Tongue River Pee Wee Point | 300 | 17 | - |
| Chief Plenty Coups Museum | 262 | 62 | - |
| Big Horn Co Historical Museum | 206 | 34 | - |
| Spring Creek Mine | 200 | 50 | - |
| Spring Creek Coal Domestic | 200 | 316 | - |
| St Charles School | 152 | 1,793 | - |
| Yellowtail Dam Gc System | 125 | 226 | - |
| 7th Ranch RV Camp | 102 | 53 | - |
| Hardin KOA Cistern | 100 | 41 | - |
| Cottonwood Camp Fort Smith | 85 | 98 | - |
| Absaloka Mine | 80 | 347 | - |
| Wegner Water Service Hauler | 50 | 657 | - |
| Yellowtail Dam Powerplant and Visitor Ce | 48 | 73 | - |
| East Decker Coal Mine | 28 | 31 | - |
| Kirby Saloon | 25 | 210 | - |
| Reese and Ray Iga Hardin | 25 | 0 | - |
Compare beyond Montana
Mid-flagged peers for Big Horn County
Cross-state counties nearest Big Horn County on flagged-system share (95.7%) and cumulative violation count (6,556). 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.
Similar violation load
Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).
Read our methodology · Check your water system - how this data is sourced, computed, and verified.
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.