Public water system · WA5373400
ActiveRock Island Dam Powerhouse I
At a glance
Rock Island Dam Powerhouse I (PWSID WA5373400) is an active non-transient non-community water system in Douglas County, Washington. It reports serving 88 people through 3 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in July 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
88
Service connections
3
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Rock Island Dam Powerhouse I compare with other water systems in Douglas County?
By EPA's size categories, Rock Island Dam Powerhouse I is a very small system (500 people or fewer). Douglas County has 46 active public water systems. Its population served is well below the county average of 886 people per system, and accounts for 0.2% of the 40,758 people reported by systems filed under the county. Across Washington, the 4,705 active systems average 2,172 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Rock Island Dam Powerhouse I is well below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Washington has 400 active non-transient non-community water systems, 8.5% of the state's 4,705 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 4,370 Washington systems (93%) list groundwater as their primary source.
Who owns and regulates Rock Island Dam Powerhouse I?
EPA lists Rock Island Dam Powerhouse I as owned by a local government. The WA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 14 of the 46 active systems in Douglas County (30%) are also owned by a local government.
Does Rock Island Dam Powerhouse I have drinking water violations?
EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in July 2018. The violations listed here began between February 1995 and July 2018. By type: 5 monitoring and reporting, 4 contaminant level above the legal limit and 1 monitoring. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 of them). EPA lists 8 as archived and 2 as resolved. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status. 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 |
|---|---|---|---|---|
| 2018-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2004-02-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 2004-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 1998-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1998-04-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1997-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1997-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1996-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1995-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1995-02-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
All 10 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.
Rock Island Dam Powerhouse I: frequently asked questions
Who runs Rock Island Dam Powerhouse I?
Rock Island Dam Powerhouse I (PWSID WA5373400) is a non-transient non-community water system owned by a local government. It is regulated by the WA state drinking water program.
How many people does Rock Island Dam Powerhouse I serve?
Rock Island Dam Powerhouse I reports serving 88 people through 3 service connections in Douglas County, Washington.
Where does Rock Island Dam Powerhouse I 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 Rock Island Dam Powerhouse I have any drinking water violations?
EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in July 2018. 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 Rock Island Dam Powerhouse I'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 10 violations for this system; 4 are health-based, and the most recent began in July 2018. For current results, consult EPA ECHO, or the WA state drinking water program.
Where can I find Rock Island Dam Powerhouse I's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Rock Island Dam Powerhouse I is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Douglas County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| East Wenatchee Water District | Douglas | 26,519 | Community | Purchased groundwater |
| Rock Island Water Dept City of | Douglas | 3,226 | Community | Groundwater |
| Bridgeport City of | Douglas | 2,214 | Community | Groundwater |
| Waterville Town of | Douglas | 1,140 | Community | Groundwater |
| Daroga State Park North | Douglas | 849 | Transient non-community | Groundwater |
| Sun Cove Public Water System | Douglas | 716 | 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, “Rock Island Dam Powerhouse I, PWSID WA5373400, Washington”, https://aquacensus.com/water-systems/washington/rock-island-dam-powerhouse-i-wa5373400 (data as of October 1, 2026).