Public water system · CO0140474
ActiveLost Valley of the San Juans
At a glance
Lost Valley of the San Juans (PWSID CO0140474) is an active transient non-community water system in Mineral County, Colorado. It reports serving 57 people through 27 service connections. Its primary water source is groundwater under influence of surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
57
Service connections
27
Primary source
GU
Groundwater under influence of surface water
System type
TNCWS
Transient non-community water system
System record
How does Lost Valley of the San Juans compare with other water systems in Mineral County?
By EPA's size categories, Lost Valley of the San Juans is a very small system (500 people or fewer). Mineral County has 14 active public water systems. Its population served is well below the county average of 393 people per system, and accounts for 1% of the 5,506 people reported by systems filed under the county. Across Colorado, the 2,207 active systems average 3,400 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Lost Valley of the San Juans is about 60% 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. Colorado has 956 active transient non-community water systems, 43% of the state's 2,207 active systems. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules. 166 Colorado systems (7.5%) list groundwater under influence of surface water as their primary source.
Who owns and regulates Lost Valley of the San Juans?
EPA lists Lost Valley of the San Juans as privately owned. The CO state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 12 of the 14 active systems in Mineral County (86%) are also privately owned.
Does Lost Valley of the San Juans have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2019. The violations listed here began between May 2006 and October 2019. By type: 9 monitoring and reporting, 2 public notice, recordkeeping or other and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2019-10-14 | Public notice, recordkeeping or otherPublic Notification Violation without NPDWR Violation · code 76 | Public Noticecode 7500 | No | Resolved |
| 2018-10-14 | Public notice, recordkeeping or otherPublic Notification Violation without NPDWR Violation · code 76 | Public Noticecode 7500 | No | Resolved |
| 2006-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2006-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2006-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2006-10-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2006-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2006-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | 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.
Lost Valley of the San Juans: frequently asked questions
Who runs Lost Valley of the San Juans?
Lost Valley of the San Juans (PWSID CO0140474) is a transient non-community water system privately owned. It is regulated by the CO state drinking water program.
How many people does Lost Valley of the San Juans serve?
Lost Valley of the San Juans reports serving 57 people through 27 service connections in Mineral County, Colorado.
Where does Lost Valley of the San Juans get its water?
EPA SDWIS lists this system's primary water source as groundwater under influence of surface water. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules.
Does Lost Valley of the San Juans have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 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 Lost Valley of the San Juans' 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, one is health-based, and the most recent began in October 2019. For current results, consult EPA ECHO, or the CO state drinking water program.
Where can I find Lost Valley of the San Juans' water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Lost Valley of the San Juans 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 Mineral County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Wolf Creek Ski Corp | Mineral | 2,050 | Transient non-community | Surface water |
| Creede City of | Mineral | 1,965 | Community | Groundwater |
| Mountain View at Rivers Edge Rv | Mineral | 640 | Transient non-community | Groundwater |
| Antlers Rio Grande Lodge | Mineral | 193 | Transient non-community | Groundwater |
| Four U R Guest Ranch | Mineral | 111 | Transient non-community | Groundwater |
| Rivercrest Acres Hoa | Mineral | 110 | 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, “Lost Valley of the San Juans, PWSID CO0140474, Colorado”, https://aquacensus.com/water-systems/colorado/lost-valley-of-the-san-juans-co0140474 (data as of October 1, 2026).