Public water system · CO0234579
ActiveOld Fort Lewis
At a glance
Old Fort Lewis (PWSID CO0234579) is an active transient non-community water system in La Plata County, Colorado. It reports serving 37 people through 8 service connections. Its primary water source is groundwater under influence of surface water, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; none is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
37
Service connections
8
Primary source
GU
Groundwater under influence of surface water
System type
TNCWS
Transient non-community water system
System record
How does Old Fort Lewis compare with other water systems in La Plata County?
By EPA's size categories, Old Fort Lewis is a very small system (500 people or fewer). La Plata County has 108 active public water systems. Its population served is well below the county average of 577 people per system, and accounts for less than 0.1% of the 62,281 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 Old Fort Lewis 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. 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 Old Fort Lewis?
EPA lists Old Fort Lewis as owned by a local government. 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. 15 of the 108 active systems in La Plata County (14%) are also owned by a local government.
Does Old Fort Lewis have drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in October 2025. The violations listed here began between October 2024 and October 2025. By type: 9 monitoring and reporting. The contaminant or rule involved most often is Interim Enhanced Surface Water Treatment Rule (5 of them). EPA lists 9 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 |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | E. colicode 3014 | No | Resolved |
| 2025-09-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2025-08-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2025-07-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2025-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2025-06-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2025-05-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | E. colicode 3014 | No | Resolved |
| 2025-05-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2024-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
All 9 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.
Old Fort Lewis: frequently asked questions
Who runs Old Fort Lewis?
Old Fort Lewis (PWSID CO0234579) is a transient non-community water system owned by a local government. It is regulated by the CO state drinking water program.
How many people does Old Fort Lewis serve?
Old Fort Lewis reports serving 37 people through 8 service connections in La Plata County, Colorado.
Where does Old Fort Lewis 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 Old Fort Lewis have any drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in October 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 Old Fort Lewis' 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 9 violations for this system; none is health-based, and the most recent began in October 2025. For current results, consult EPA ECHO, or the CO state drinking water program.
Where can I find Old Fort Lewis' water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Old Fort Lewis 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 La Plata County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Durango City of | La Plata | 33,787 | Community | Surface water |
| Animas Wc | La Plata | 3,096 | Community | Groundwater |
| Bayfield Town of | La Plata | 2,300 | Community | Surface water |
| Forest Lakes Md | La Plata | 1,699 | Community | Groundwater |
| Lake Durango Wa | La Plata | 1,577 | Community | Surface water |
| Purgatory Md | La Plata | 1,364 | 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, “Old Fort Lewis, PWSID CO0234579, Colorado”, https://aquacensus.com/water-systems/colorado/old-fort-lewis-co0234579 (data as of October 1, 2026).