Public water system · OR4100719
ActiveUmpqua Basin Water Assoc
At a glance
Umpqua Basin Water Assoc (PWSID OR4100719) is an active community water system in Douglas County, Oregon. It reports serving 9,499 people through 4,603 service connections. Its primary water source is surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in August 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
9,499
Service connections
4,603
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Umpqua Basin Water Assoc compare with other water systems in Douglas County?
By EPA's size categories, Umpqua Basin Water Assoc is a medium system (3,301 to 10,000 people). Douglas County has 102 active public water systems, and Umpqua Basin Water Assoc is the 2nd-largest of them by population served. Its population served is about 10 times the county average of 916 people per system, and accounts for 10% of the 93,402 people reported by systems filed under the county. Across Oregon, the 2,536 active systems average 1,587 people each. Nationally, the average active community water system reports serving 6,703 people, so Umpqua Basin Water Assoc is about 42% above 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. Oregon has 940 active community water systems, 37% of the state's 2,536 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 211 Oregon systems (8.3%) list surface water as their primary source.
Who owns and regulates Umpqua Basin Water Assoc?
EPA lists Umpqua Basin Water Assoc as privately owned. The OR state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 59 of the 102 active systems in Douglas County (58%) are also privately owned.
Does Umpqua Basin Water Assoc have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in August 2025. The violations listed here began between May 2013 and August 2025. By type: 10 monitoring and reporting, 1 public notice, recordkeeping or other and 1 required treatment not met. The contaminant or rule involved most often is Surface Water Treatment Rule (6 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2025-08-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2025-07-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2025-06-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2025-05-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2024-07-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2024-07-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2024-05-30 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2024-04-01 | Required treatment not metOCCT/SOWT Study/Recommendation · code 57 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2013-05-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
The 12 most recent 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.
Umpqua Basin Water Assoc: frequently asked questions
Who runs Umpqua Basin Water Assoc?
Umpqua Basin Water Assoc (PWSID OR4100719) is a community water system privately owned. It is regulated by the OR state drinking water program.
How many people does Umpqua Basin Water Assoc serve?
Umpqua Basin Water Assoc reports serving 9,499 people through 4,603 service connections in Douglas County, Oregon.
Where does Umpqua Basin Water Assoc 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 Umpqua Basin Water Assoc have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in August 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 Umpqua Basin Water Assoc'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. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in August 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the OR state drinking water program.
Where can I find Umpqua Basin Water Assoc's water quality report?
As a community water system, Umpqua Basin Water Assoc 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 Douglas County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Roseburg, City of | Douglas | 28,800 | Community | Surface water |
| Winston-Dillard Water District | Douglas | 8,300 | Community | Surface water |
| Sutherlin, City of | Douglas | 8,060 | Community | Surface water |
| Green Area Water & Sanitary Authority | Douglas | 7,000 | Community | Surface water |
| Reedsport, City of | Douglas | 4,836 | Community | Surface water |
| Myrtle Creek, City of | Douglas | 3,501 | Community | 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, “Umpqua Basin Water Assoc, PWSID OR4100719, Oregon”, https://aquacensus.com/water-systems/oregon/umpqua-basin-water-assoc-or4100719 (data as of October 1, 2026).