Public water system · OR4192508
ActiveUsfs South Twin Lake Cg
At a glance
Usfs South Twin Lake Cg (PWSID OR4192508) is an active transient non-community water system in Deschutes County, Oregon. It reports serving 155 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as owned by the federal government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
155
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Usfs South Twin Lake Cg compare with other water systems in Deschutes County?
By EPA's size categories, Usfs South Twin Lake Cg is a very small system (500 people or fewer). Deschutes County has 135 active public water systems. Its population served is well below the county average of 1,515 people per system, and accounts for less than 0.1% of the 204,467 people reported by systems filed under the county. Across Oregon, the 2,536 active systems average 1,587 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Usfs South Twin Lake Cg is roughly in line with 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. Oregon has 1,250 active transient non-community water systems, 49% of the state's 2,536 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,175 Oregon systems (86%) list groundwater as their primary source.
Who owns and regulates Usfs South Twin Lake Cg?
EPA lists Usfs South Twin Lake Cg as owned by the federal government. The OR state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 20 of the 135 active systems in Deschutes County (15%) are also owned by the federal government.
Does Usfs South Twin Lake Cg have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2025. The violations listed here began between July 2013 and April 2025. By type: 6 monitoring, 5 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Revised Total Coliform Rule (6 of them). EPA lists 11 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2025-01-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | Coliphagecode 3028 | No | Archived |
| 2024-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2023-08-08 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2022-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2021-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2019-05-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2019-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-01-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | Coliphagecode 3028 | No | Resolved |
| 2015-01-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | Coliphagecode 3028 | No | Resolved |
| 2013-08-16 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2013-07-24 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
The 12 most recent 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.
Usfs South Twin Lake Cg: frequently asked questions
Who runs Usfs South Twin Lake Cg?
Usfs South Twin Lake Cg (PWSID OR4192508) is a transient non-community water system owned by the federal government. It is regulated by the OR state drinking water program.
How many people does Usfs South Twin Lake Cg serve?
Usfs South Twin Lake Cg reports serving 155 people through 1 service connection in Deschutes County, Oregon.
Where does Usfs South Twin Lake Cg 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 Usfs South Twin Lake Cg have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2025. 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 Usfs South Twin Lake Cg'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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2025. For current results, consult EPA ECHO, or the OR state drinking water program.
Where can I find Usfs South Twin Lake Cg's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Usfs South Twin Lake Cg 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 Deschutes County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Bend, City of | Deschutes | 77,704 | Community | Surface water |
| Redmond Water Department | Deschutes | 37,566 | Community | Groundwater |
| Avion Wc - Greater Avion | Deschutes | 35,332 | Community | Groundwater |
| Roats Water System | Deschutes | 6,469 | Community | Groundwater |
| Sunriver Water LLC/Sunriver Utilities | Deschutes | 4,300 | Community | Groundwater |
| Sisters, City of | Deschutes | 3,778 | 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, “Usfs South Twin Lake Cg, PWSID OR4192508, Oregon”, https://aquacensus.com/water-systems/oregon/usfs-south-twin-lake-cg-or4192508 (data as of October 1, 2026).