Public water system · OR4105117
ActiveDark Hollow Water Association
At a glance
Dark Hollow Water Association (PWSID OR4105117) is an active community water system in Jackson County, Oregon. It reports serving 45 people through 13 service connections. Its primary water source is groundwater, 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 September 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
45
Service connections
13
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Dark Hollow Water Association compare with other water systems in Jackson County?
By EPA's size categories, Dark Hollow Water Association is a very small system (500 people or fewer). Jackson County has 200 active public water systems. Its population served is well below the county average of 983 people per system, and accounts for less than 0.1% of the 196,508 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 Dark Hollow Water Association 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. Oregon has 940 active community water systems, 37% of the state's 2,536 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,175 Oregon systems (86%) list groundwater as their primary source.
Who owns and regulates Dark Hollow Water Association?
EPA lists Dark Hollow Water Association 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. 153 of the 200 active systems in Jackson County (77%) are also privately owned.
Does Dark Hollow Water Association have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in September 2022. The violations listed here began between April 2017 and September 2022. By type: 10 monitoring and reporting, 1 contaminant level above the legal limit and 1 monitoring. The contaminant or rule involved most often is Combined Radium (-226 and -228) (3 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 |
|---|---|---|---|---|
| 2022-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2019-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2019-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2017-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Uraniumcode 4006 | No | Resolved |
| 2017-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 2017-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Resolved |
| 2017-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 2017-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Uraniumcode 4006 | No | Resolved |
| 2017-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Resolved |
| 2017-07-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2017-05-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | 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.
Dark Hollow Water Association: frequently asked questions
Who runs Dark Hollow Water Association?
Dark Hollow Water Association (PWSID OR4105117) is a community water system privately owned. It is regulated by the OR state drinking water program.
How many people does Dark Hollow Water Association serve?
Dark Hollow Water Association reports serving 45 people through 13 service connections in Jackson County, Oregon.
Where does Dark Hollow Water Association get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Dark Hollow Water Association 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 September 2022. 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 Dark Hollow Water Association'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 September 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the OR state drinking water program.
Where can I find Dark Hollow Water Association's water quality report?
As a community water system, Dark Hollow Water Association 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 Jackson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Medford Water Commission | Jackson | 106,068 | Community | Surface water |
| Ashland Water Department | Jackson | 20,946 | Community | Surface water |
| Central Point, City of | Jackson | 19,785 | Community | Purchased surface water |
| Eagle Point, City of | Jackson | 9,554 | Community | Purchased surface water |
| Talent, City of | Jackson | 6,293 | Community | Purchased surface water |
| Phoenix, City of | Jackson | 5,900 | 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, “Dark Hollow Water Association, PWSID OR4105117, Oregon”, https://aquacensus.com/water-systems/oregon/dark-hollow-water-association-or4105117 (data as of October 1, 2026).