Public water system · CO0134717
ActiveSouthwest Horizon Ranch
At a glance
Southwest Horizon Ranch (PWSID CO0134717) is an active community water system in La Plata County, Colorado. It reports serving 323 people through 60 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in May 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
323
Service connections
60
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Southwest Horizon Ranch compare with other water systems in La Plata County?
By EPA's size categories, Southwest Horizon Ranch is a very small system (500 people or fewer). La Plata County has 108 active public water systems. Its population served is about 44% below the county average of 577 people per system, and accounts for 0.5% 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 community water system reports serving 6,703 people, so Southwest Horizon Ranch is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Colorado has 1,068 active community water systems, 48% of the state's 2,207 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,437 Colorado systems (65%) list groundwater as their primary source.
Who owns and regulates Southwest Horizon Ranch?
EPA lists Southwest Horizon Ranch 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. 84 of the 108 active systems in La Plata County (78%) are also privately owned.
Does Southwest Horizon Ranch have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in May 2022. The violations listed here began between October 2015 and May 2022. By type: 10 monitoring and reporting, 1 public notice, recordkeeping or other and 1 monitoring. The contaminant or rule involved most often is Revised Total Coliform Rule (2 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 |
|---|---|---|---|---|
| 2022-05-05 | Public notice, recordkeeping or otherSample Siting Plan Errors (RTCR) · code 5A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2018-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2018-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Vinyl chloridecode 2976 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Benzenecode 2990 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | o-Dichlorobenzenecode 2968 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Uraniumcode 4006 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Tetrachloroethylenecode 2987 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | 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.
Southwest Horizon Ranch: frequently asked questions
Who runs Southwest Horizon Ranch?
Southwest Horizon Ranch (PWSID CO0134717) is a community water system privately owned. It is regulated by the CO state drinking water program.
How many people does Southwest Horizon Ranch serve?
Southwest Horizon Ranch reports serving 323 people through 60 service connections in La Plata County, Colorado.
Where does Southwest Horizon Ranch 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 Southwest Horizon Ranch 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 May 2022. 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 Southwest Horizon Ranch'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 May 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the CO state drinking water program.
Where can I find Southwest Horizon Ranch's water quality report?
As a community water system, Southwest Horizon Ranch must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
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, “Southwest Horizon Ranch, PWSID CO0134717, Colorado”, https://aquacensus.com/water-systems/colorado/southwest-horizon-ranch-co0134717 (data as of October 1, 2026).