Public water system · CO0103710
ActiveSierra Bonita Estates
At a glance
Sierra Bonita Estates (PWSID CO0103710) is an active community water system in Arapahoe County, Colorado. It reports serving 122 people through 48 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
122
Service connections
48
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Sierra Bonita Estates compare with other water systems in Arapahoe County?
By EPA's size categories, Sierra Bonita Estates is a very small system (500 people or fewer). Arapahoe County has 39 active public water systems. Its population served is well below the county average of 22,146 people per system, and accounts for less than 0.1% of the 863,682 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 Sierra Bonita 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 Sierra Bonita Estates?
EPA lists Sierra Bonita 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. 22 of the 39 active systems in Arapahoe County (56%) are also privately owned.
Does Sierra Bonita Estates have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in October 2025. The violations listed here began between July 2025 and October 2025. By type: 1 monitoring and reporting, 1 public notice, recordkeeping or other and 1 required treatment not met. The contaminants or rules involved are Lead and Copper Rule, Public Notice and Lead and Copper Rule Revisions. EPA lists 3 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 reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2025-09-19 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2025-07-02 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Resolved |
All 3 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.
Sierra Bonita Estates: frequently asked questions
Who runs Sierra Bonita Estates?
Sierra Bonita Estates (PWSID CO0103710) is a community water system privately owned. It is regulated by the CO state drinking water program.
How many people does Sierra Bonita Estates serve?
Sierra Bonita Estates reports serving 122 people through 48 service connections in Arapahoe County, Colorado.
Where does Sierra Bonita 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 Sierra Bonita Estates have any drinking water violations?
EPA's records list 3 violations for this system; 1 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 Sierra Bonita 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 3 violations for this system; 1 is health-based, and the most recent began in October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the CO state drinking water program.
Where can I find Sierra Bonita Estates' water quality report?
As a community water system, Sierra Bonita 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 Arapahoe County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Aurora City of | Arapahoe | 533,407 | Community | Surface water |
| East Cherry Creek Valley Wsd | Arapahoe | 66,130 | Community | Purchased surface water |
| Englewood City of | Arapahoe | 57,332 | Community | Surface water |
| Southgate Wsd | Arapahoe | 55,000 | Community | Purchased surface water |
| Southwest Metropolitan Wsd | Arapahoe | 48,648 | Community | Purchased surface water |
| Arapahoe Cnty Wwwa | Arapahoe | 31,000 | 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, “Sierra Bonita Estates, PWSID CO0103710, Colorado”, https://aquacensus.com/water-systems/colorado/sierra-bonita-estates-co0103710 (data as of October 1, 2026).