Public water system · MT0062237
ActiveEmerald Lake Campground
At a glance
Emerald Lake Campground (PWSID MT0062237) is an active transient non-community water system in Stillwater County, Montana. It reports serving 30 people through 2 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. EPA's records list 11 violations for this system; 4 are health-based, and the most recent began in September 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
30
Service connections
2
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Emerald Lake Campground compare with other water systems in Stillwater County?
By EPA's size categories, Emerald Lake Campground is a very small system (500 people or fewer). Stillwater County has 30 active public water systems. Its population served is well below the county average of 278 people per system, and accounts for 0.4% of the 8,352 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 Emerald Lake Campground 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,994 Montana systems (84%) list groundwater as their primary source.
Who owns and regulates Emerald Lake Campground?
EPA lists Emerald Lake Campground as owned by the federal government. 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. 2 of the 30 active systems in Stillwater County (6.7%) are also owned by the federal government.
Does Emerald Lake Campground have drinking water violations?
EPA's records list 11 violations for this system; 4 are health-based, and the most recent began in September 2019. The violations listed here began between July 1994 and September 2019. By type: 7 monitoring and reporting and 4 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 of them). EPA lists 11 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2019-09-11 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2013-09-01 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2011-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | No | Resolved |
| 2011-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | No | Resolved |
| 2010-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2009-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2001-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2000-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1994-07-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 11 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Emerald Lake Campground: frequently asked questions
Who runs Emerald Lake Campground?
Emerald Lake Campground (PWSID MT0062237) is a transient non-community water system owned by the federal government. It is regulated by the MT state drinking water program.
How many people does Emerald Lake Campground serve?
Emerald Lake Campground reports serving 30 people through 2 service connections in Stillwater County, Montana.
Where does Emerald Lake Campground get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Emerald Lake Campground have any drinking water violations?
EPA's records list 11 violations for this system; 4 are health-based, and the most recent began in September 2019. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Emerald Lake Campground'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 records list 11 violations for this system; 4 are health-based, and the most recent began in September 2019. For current results, consult EPA ECHO, or the MT state drinking water program.
Where can I find Emerald Lake Campground's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Emerald Lake Campground 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 Stillwater County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Columbus Town of | Stillwater | 1,900 | Community | Groundwater |
| Cenex Zip Trip Num 50 | Stillwater | 1,500 | Transient non-community | Groundwater |
| Absarokee Water and Sewer Dist | Stillwater | 1,100 | Community | Groundwater |
| Columbus Rest Area Westbound | Stillwater | 800 | Transient non-community | Groundwater |
| Columbus Rest Area Eastbound | Stillwater | 800 | Transient non-community | Groundwater |
| Stillwater Mining Company | Stillwater | 630 | Non-transient non-community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Emerald Lake Campground, PWSID MT0062237, Montana”, https://aquacensus.com/water-systems/montana/emerald-lake-campground-mt0062237 (data as of October 1, 2026).