Public water system · CO0128726

Active

Tres Valles West

At a glance

Tres Valles West (PWSID CO0128726) is an active community water system in Huerfano County, Colorado. It reports serving 68 people through 30 service connections. Its primary water source is groundwater under influence of surface water, and EPA lists it as privately owned. EPA's records list 8 violations for this system; 4 are health-based, and the most recent began in May 2024.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

Service connections

Primary source

Groundwater under influence of surface water

System type

CWS

Community water system

System record

PWSIDCO0128726

System typeCommunity water system

Activity statusActive

Population served68

Service connections30

Primary water sourceGroundwater under influence of surface water

Owner typePrivate

Primacy agencyCO state drinking water program

City served—

StateColorado

ZIP—

CountyHuerfano County

How does Tres Valles West compare with other water systems in Huerfano County?

By EPA's size categories, Tres Valles West is a very small system (500 people or fewer). Huerfano County has 13 active public water systems. Its population served is well below the county average of 477 people per system, and accounts for 1.1% of the 6,202 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 Tres Valles West 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 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 Tres Valles West?

EPA lists Tres Valles West 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. 5 of the 13 active systems in Huerfano County (38%) are also privately owned.

Does Tres Valles West have drinking water violations?

EPA's records list 8 violations for this system; 4 are health-based, and the most recent began in May 2024. The violations listed here began between January 2007 and May 2024. By type: 4 required treatment not met and 4 monitoring and reporting. The contaminant or rule involved most often is Interim Enhanced Surface Water Treatment Rule (2 of them). EPA lists 8 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
2024-05-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
2017-08-11	Required treatment not metFailure To Address Deficiency · code 45	Groundwater Rulecode 0700	Yes	Resolved
2016-04-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2015-05-29	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2012-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2007-02-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2007-01-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	No	Resolved
2007-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved

All 8 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.

Tres Valles West: frequently asked questions

Who runs Tres Valles West?

Tres Valles West (PWSID CO0128726) is a community water system privately owned. It is regulated by the CO state drinking water program.

How many people does Tres Valles West serve?

Tres Valles West reports serving 68 people through 30 service connections in Huerfano County, Colorado.

Where does Tres Valles West 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 Tres Valles West have any drinking water violations?

EPA's records list 8 violations for this system; 4 are health-based, and the most recent began in May 2024. 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 Tres Valles West'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 8 violations for this system; 4 are health-based, and the most recent began in May 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the CO state drinking water program.

Where can I find Tres Valles West's water quality report?

As a community water system, Tres Valles West 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 Huerfano County

Water system	County	Population served	Type	Source
Walsenburg City of	Huerfano	3,230	Community	Surface water
La Veta Town of	Huerfano	850	Community	Surface water
Gardner Water and Sanitation Dist	Huerfano	400	Community	Groundwater
Cucharas Sanitation and Water District	Huerfano	343	Community	Surface water
Navajo Western Wd Resorts	Huerfano	341	Community	Groundwater
LDS Joseph	Huerfano	300	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, “Tres Valles West, PWSID CO0128726, Colorado”, https://aquacensus.com/water-systems/colorado/tres-valles-west-co0128726 (data as of October 1, 2026).