Public water system · WA5365484
ActiveTransalta Centralia Generation
At a glance
Transalta Centralia Generation (PWSID WA5365484) is an active non-transient non-community water system in Lewis County, Washington. It reports serving 200 people through 36 service connections. Its primary water source is surface water, and EPA lists it as privately owned. EPA's records list 9 violations for this system; 4 are health-based, and the most recent began in January 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
200
Service connections
36
Primary source
SW
Surface water
System type
NTNCWS
Non-transient non-community water system
System record
How does Transalta Centralia Generation compare with other water systems in Lewis County?
By EPA's size categories, Transalta Centralia Generation is a very small system (500 people or fewer). Lewis County has 166 active public water systems. Its population served is about 63% below the county average of 537 people per system, and accounts for 0.2% of the 89,186 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 Transalta Centralia Generation is about half of 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 140 Washington systems (3%) list surface water as their primary source.
Who owns and regulates Transalta Centralia Generation?
EPA lists Transalta Centralia Generation as privately owned. 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. 117 of the 166 active systems in Lewis County (70%) are also privately owned.
Does Transalta Centralia Generation have drinking water violations?
EPA's records list 9 violations for this system; 4 are health-based, and the most recent began in January 2026. The violations listed here began between June 1992 and January 2026. By type: 5 monitoring and reporting and 4 required treatment not met. The contaminant or rule involved most often is Surface Water Treatment Rule (6 of them). EPA lists 5 as archived and 4 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 |
|---|---|---|---|---|
| 2026-01-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2021-03-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2017-06-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 2011-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Asbestoscode 1094 | No | Archived |
| 2009-12-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1995-05-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 1993-10-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 1992-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1992-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 9 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.
Transalta Centralia Generation: frequently asked questions
Who runs Transalta Centralia Generation?
Transalta Centralia Generation (PWSID WA5365484) is a non-transient non-community water system privately owned. It is regulated by the WA state drinking water program.
How many people does Transalta Centralia Generation serve?
Transalta Centralia Generation reports serving 200 people through 36 service connections in Lewis County, Washington.
Where does Transalta Centralia Generation 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 Transalta Centralia Generation have any drinking water violations?
EPA's records list 9 violations for this system; 4 are health-based, and the most recent began in January 2026. 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 Transalta Centralia Generation'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 9 violations for this system; 4 are health-based, and the most recent began in January 2026. For current results, consult EPA ECHO, or the WA state drinking water program.
Where can I find Transalta Centralia Generation's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Transalta Centralia Generation 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 Lewis County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Centralia Public Works - Water | Lewis | 28,164 | Community | Groundwater |
| Chehalis Water Department | Lewis | 11,718 | Community | Surface water |
| Winlock City of | Lewis | 3,502 | Community | Groundwater |
| Napavine City of | Lewis | 3,095 | Community | Groundwater |
| Boistfort Valley | Lewis | 2,389 | Community | Surface water |
| Morton City of | Lewis | 2,147 | 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, “Transalta Centralia Generation, PWSID WA5365484, Washington”, https://aquacensus.com/water-systems/washington/transalta-centralia-generation-wa5365484 (data as of October 1, 2026).