Public water system · WA5375100
ActiveRyderwood Improvement & Service As
At a glance
Ryderwood Improvement & Service As (PWSID WA5375100) is an active community water system in Cowlitz County, Washington. It reports serving 434 people through 292 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in July 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
434
Service connections
292
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Ryderwood Improvement & Service As compare with other water systems in Cowlitz County?
By EPA's size categories, Ryderwood Improvement & Service As is a very small system (500 people or fewer). Cowlitz County has 77 active public water systems. Its population served is well below the county average of 1,628 people per system, and accounts for 0.3% of the 125,351 people reported by systems filed under the county. Across Washington, the 4,705 active systems average 2,172 people each. Nationally, the average active community water system reports serving 6,703 people, so Ryderwood Improvement & Service As 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. Washington has 2,392 active community water systems, 51% 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 Ryderwood Improvement & Service As?
EPA lists Ryderwood Improvement & Service As 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 77 active systems in Cowlitz County (18%) are also owned by a local government.
Does Ryderwood Improvement & Service As have drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in July 2024. The violations listed here began between January 2007 and July 2024. By type: 8 monitoring and reporting, 2 public notice, recordkeeping or other and 2 required treatment not met. The contaminant or rule involved most often is Surface Water Treatment Rule (4 of them). EPA lists 8 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 |
|---|---|---|---|---|
| 2024-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2022-10-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2022-06-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2014-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2008-03-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 2007-12-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Trichloroethylenecode 2984 | No | Archived |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1,2-Trichloroethanecode 2985 | No | Archived |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbon tetrachloridecode 2982 | No | Archived |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1,1-Trichloroethanecode 2981 | No | Archived |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dichloroethanecode 2980 | No | Archived |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Vinyl chloridecode 2976 | No | Archived |
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.
Ryderwood Improvement & Service As: frequently asked questions
Who runs Ryderwood Improvement & Service As?
Ryderwood Improvement & Service As (PWSID WA5375100) is a community water system owned by a local government. It is regulated by the WA state drinking water program.
How many people does Ryderwood Improvement & Service As serve?
Ryderwood Improvement & Service As reports serving 434 people through 292 service connections in Cowlitz County, Washington.
Where does Ryderwood Improvement & Service As 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 Ryderwood Improvement & Service As have any drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in July 2024. 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 Ryderwood Improvement & Service As' 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, 2 are health-based, and the most recent began in July 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the WA state drinking water program.
Where can I find Ryderwood Improvement & Service As' water quality report?
As a community water system, Ryderwood Improvement & Service As 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 Cowlitz County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Longview Water Department | Cowlitz | 57,617 | Community | Groundwater |
| Kelso City of | Cowlitz | 15,775 | Community | Groundwater under influence of surface water |
| Beacon Hill Water & Sewer District | Cowlitz | 11,969 | Community | Purchased groundwater |
| Woodland City of | Cowlitz | 10,640 | Community | Groundwater under influence of surface water |
| Kalama City of | Cowlitz | 8,020 | Community | Groundwater under influence of surface water |
| Castle Rock Municipal Water | Cowlitz | 4,367 | 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, “Ryderwood Improvement & Service As, PWSID WA5375100, Washington”, https://aquacensus.com/water-systems/washington/ryderwood-improvement-service-as-wa5375100 (data as of October 1, 2026).