Public water system · CO0101741
ActiveThornton Estates
At a glance
Thornton Estates (PWSID CO0101741) is an active community water system in Adams County, Colorado. It reports serving 300 people through 208 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
300
Service connections
208
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Thornton Estates compare with other water systems in Adams County?
By EPA's size categories, Thornton Estates is a very small system (500 people or fewer). Adams County has 82 active public water systems. Its population served is well below the county average of 8,669 people per system, and accounts for less than 0.1% of the 710,822 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 Thornton Estates 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 Thornton Estates?
EPA lists Thornton Estates 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. 62 of the 82 active systems in Adams County (76%) are also privately owned.
Does Thornton Estates have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2026. By type: 1 monitoring and reporting. The contaminant or rule involved is Lead and Copper 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 |
|---|---|---|---|---|
| 2026-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | 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.
Thornton Estates: frequently asked questions
Who runs Thornton Estates?
Thornton Estates (PWSID CO0101741) is a community water system privately owned. It is regulated by the CO state drinking water program.
How many people does Thornton Estates serve?
Thornton Estates reports serving 300 people through 208 service connections in Adams County, Colorado.
Where does Thornton Estates 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 Thornton Estates 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 January 2026. 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 Thornton Estates' 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 January 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the CO state drinking water program.
Where can I find Thornton Estates' water quality report?
As a community water system, Thornton Estates 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 Adams County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Thornton City of | Adams | 226,465 | Community | Surface water |
| Westminster City of | Adams | 202,078 | Community | Surface water |
| South Adams County Wsd | Adams | 75,559 | Community | Purchased surface water |
| Brighton City of | Adams | 56,304 | Community | Purchased surface water |
| Northglenn City of | Adams | 48,927 | Community | Surface water |
| Crestview Wsd | Adams | 23,756 | 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, “Thornton Estates, PWSID CO0101741, Colorado”, https://aquacensus.com/water-systems/colorado/thornton-estates-co0101741 (data as of October 1, 2026).