Public water system · MT0002008
ActiveHardin Koa Cistern
Transient non-community water system in Big Horn County, Montana, drawing primarily on purchased surface water.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
100
Service connections
49
Primary source
SWP
Purchased surface water
System type
TNCWS
Transient non-community water system
System record
Violations & enforcement
| Began | Violation | Contaminant | Health-based | Status |
|---|---|---|---|---|
| 2026-01-17 | 2A | 8000 | Yes | Addressed |
| 2025-10-01 | 3A | 8000 | No | Archived |
| 2024-09-01 | 3A | 8000 | No | Archived |
| 2024-07-01 | 3A | 8000 | No | Archived |
| 2024-02-01 | 3A | 8000 | No | Archived |
| 2017-04-01 | 3A | 8000 | No | Resolved |
| 2006-10-01 | 23 | 3100 | No | Resolved |
| 2006-07-01 | 22 | 3100 | Yes | Resolved |
| 2006-06-01 | 23 | 3100 | No | Resolved |
| 1994-06-01 | 23 | 3100 | No | Resolved |
| 1983-10-01 | 03 | 1040 | No | Archived |
| 1982-10-01 | 03 | 1040 | No | Archived |
Hardin Koa Cistern: frequently asked questions
Is Hardin Koa Cistern's water safe to drink?
Hardin Koa Cistern is an active transient non-community water system regulated under the Safe Drinking Water Act, overseen by the MT state drinking water program. EPA SDWA violation and enforcement records for this system are being added to AquaCensus from EPA ECHO; consult EPA ECHO or your annual Consumer Confidence Report for its current compliance status.
Who runs Hardin Koa Cistern?
Hardin Koa Cistern (PWSID MT0002008) is a private-owned transient non-community water system, regulated by the MT state drinking water program.
How many people does Hardin Koa Cistern serve?
Hardin Koa Cistern reports serving 100 people through 49 service connections in Big Horn County, Montana.
Where does Hardin Koa Cistern get its water?
EPA SDWIS lists this system's primary water source as purchased surface water.
Other water systems in Big Horn County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Hardin City of | Big Horn | 3,500 | Community | Surface water |
| Greybull, Town of | Big Horn | 3,260 | Community | Groundwater |
| Lovell, Town of | Big Horn | 2,360 | Community | Purchased surface water |
| Little Bighorn Battlefield Nm | Big Horn | 2,020 | Non-transient non-community | Groundwater |
| Basin, Town of | Big Horn | 1,250 | Community | Purchased groundwater |
| South Big Horn County Jpb | Big Horn | 900 | Community | Groundwater |