Public water system · CO0130667
ActiveRalston Valley Wsd
At a glance
Ralston Valley Wsd (PWSID CO0130667) is an active community water system in Jefferson County, Colorado. It reports serving 1,610 people through 550 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in July 2006.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,610
Service connections
550
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Ralston Valley Wsd compare with other water systems in Jefferson County?
By EPA's size categories, Ralston Valley Wsd is a small system (501 to 3,300 people). Jefferson County has 112 active public water systems. Its population served is well below the county average of 5,159 people per system, and accounts for 0.3% of the 577,783 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 Ralston Valley Wsd 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 337 Colorado systems (15%) list purchased surface water as their primary source.
Who owns and regulates Ralston Valley Wsd?
EPA lists Ralston Valley Wsd 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. 39 of the 112 active systems in Jefferson County (35%) are also owned by a local government.
Does Ralston Valley Wsd have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in July 2006. By type: 1 public notice, recordkeeping or other. The contaminant or rule involved is Consumer Confidence Rule. EPA lists 1 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 |
|---|---|---|---|---|
| 2006-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
The one violation in EPA's records.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.
Ralston Valley Wsd: frequently asked questions
Who runs Ralston Valley Wsd?
Ralston Valley Wsd (PWSID CO0130667) is a community water system owned by a local government. It is regulated by the CO state drinking water program.
How many people does Ralston Valley Wsd serve?
Ralston Valley Wsd reports serving 1,610 people through 550 service connections in Jefferson County, Colorado.
Where does Ralston Valley Wsd get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Ralston Valley Wsd have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in July 2006. 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 Ralston Valley Wsd'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 one violation for this system; it is not health-based, and the most recent began in July 2006. For current results, consult the system's annual water quality report, EPA ECHO, or the CO state drinking water program.
Where can I find Ralston Valley Wsd's water quality report?
As a community water system, Ralston Valley Wsd 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 Jefferson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Arvada City of | Jefferson | 171,610 | Community | Surface water |
| Consolidated Mutual Maple Grove | Jefferson | 81,400 | Community | Surface water |
| Green Mountain Wsd | Jefferson | 49,400 | Community | Purchased surface water |
| Bancroft Clover Wsd | Jefferson | 44,000 | Community | Purchased surface water |
| Golden City of | Jefferson | 38,288 | Community | Surface water |
| Bear Creek Wsd | Jefferson | 30,000 | Community | Purchased surface water |
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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, “Ralston Valley Wsd, PWSID CO0130667, Colorado”, https://aquacensus.com/water-systems/colorado/ralston-valley-wsd-co0130667 (data as of October 1, 2026).