Public water system · MT0005230
ActiveFlat Creek Mercantile
At a glance
Flat Creek Mercantile (PWSID MT0005230) is an active transient non-community water system in Lewis and Clark County, Montana. It reports serving 25 people through 1 service connection. Its primary water source is purchased surface water, and EPA lists it as privately owned. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
25
Service connections
1
Primary source
SWP
Purchased surface water
System type
TNCWS
Transient non-community water system
System record
How does Flat Creek Mercantile compare with other water systems in Lewis and Clark County?
By EPA's size categories, Flat Creek Mercantile is a very small system (500 people or fewer). Lewis and Clark County has 165 active public water systems. Its population served is well below the county average of 413 people per system, and accounts for less than 0.1% of the 68,071 people reported by systems filed under the county. Across Montana, the 2,378 active systems average 489 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Flat Creek Mercantile is well below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Montana has 1,206 active transient non-community water systems, 51% of the state's 2,378 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 212 Montana systems (8.9%) list purchased surface water as their primary source.
Who owns and regulates Flat Creek Mercantile?
EPA lists Flat Creek Mercantile as privately owned. The MT state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 134 of the 165 active systems in Lewis and Clark County (81%) are also privately owned.
Does Flat Creek Mercantile have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Flat Creek Mercantile. For the latest compliance status, check EPA ECHO for current compliance history.
Flat Creek Mercantile: frequently asked questions
Who runs Flat Creek Mercantile?
Flat Creek Mercantile (PWSID MT0005230) is a transient non-community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Flat Creek Mercantile serve?
Flat Creek Mercantile reports serving 25 people through 1 service connection in Lewis and Clark County, Montana.
Where does Flat Creek Mercantile get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Flat Creek Mercantile have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Flat Creek Mercantile's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's Safe Drinking Water Act records list no violations for this system. For current results, consult EPA ECHO, or the MT state drinking water program.
Where can I find Flat Creek Mercantile's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Flat Creek Mercantile is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Lewis and Clark County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Helena Water System | Lewis and Clark | 32,091 | Community | Surface water |
| East Helena City of | Lewis and Clark | 2,114 | Community | Groundwater |
| Eastgate Village Sewer and Water | Lewis and Clark | 2,000 | Community | Groundwater |
| Va Medical Center Helena | Lewis and Clark | 1,275 | Community | Purchased surface water |
| Helena Leisure LLC | Lewis and Clark | 1,200 | Community | Groundwater |
| Bobs Valley Service Inc. | Lewis and Clark | 1,032 | Non-transient non-community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Flat Creek Mercantile, PWSID MT0005230, Montana”, https://aquacensus.com/water-systems/montana/flat-creek-mercantile-mt0005230 (data as of October 1, 2026).