Public water system · CO0103005
ActiveAurora City of
At a glance
City of Aurora (PWSID CO0103005) is an active community water system in Arapahoe County, Colorado. It reports serving 533,407 people through 91,821 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in January 2016.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
533,407
Service connections
91,821
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does City of Aurora compare with other water systems in Arapahoe County?
By EPA's size categories, City of Aurora is a very large system (more than 100,000 people). Arapahoe County has 39 active public water systems, and City of Aurora is the largest of them by population served. Its population served is about 24 times the county average of 22,146 people per system, and accounts for 62% 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 City of Aurora is about 80 times 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 228 Colorado systems (10%) list surface water as their primary source.
Who owns and regulates City of Aurora?
EPA lists City of Aurora 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. 17 of the 39 active systems in Arapahoe County (44%) are also owned by a local government.
Does City of Aurora have drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in January 2016. The violations listed here began between April 2002 and January 2016. By type: 5 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (2 of them). EPA lists 6 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 |
|---|---|---|---|---|
| 2016-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2016-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2011-05-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2011-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2002-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
All 6 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.
City of Aurora: frequently asked questions
Who runs City of Aurora?
City of Aurora (PWSID CO0103005) is a community water system owned by a local government. It is regulated by the CO state drinking water program.
How many people does City of Aurora serve?
City of Aurora reports serving 533,407 people through 91,821 service connections in Arapahoe County, Colorado.
Where does City of Aurora get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does City of Aurora have any drinking water violations?
EPA's records list 6 violations for this system; 1 is health-based, and the most recent began in January 2016. 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 City of Aurora'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 6 violations for this system; 1 is health-based, and the most recent began in January 2016. For current results, consult the system's annual water quality report, EPA ECHO, or the CO state drinking water program.
Where can I find City of Aurora's water quality report?
As a community water system, City of Aurora 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 |
|---|---|---|---|---|
| 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 |
| Platte Canyon Wsd | Arapahoe | 19,485 | 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, “Aurora City of, PWSID CO0103005, Colorado”, https://aquacensus.com/water-systems/colorado/aurora-city-of-co0103005 (data as of October 1, 2026).