Public water system · CA5301002
ActiveLewiston Community Services District
At a glance
Lewiston Community Services District (PWSID CA5301002) is an active community water system in Trinity County, California. It reports serving 677 people through 234 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, 10 are health-based, and the most recent began in March 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
677
Service connections
234
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Lewiston Community Services District compare with other water systems in Trinity County?
By EPA's size categories, Lewiston Community Services District is a small system (501 to 3,300 people). Trinity County has 42 active public water systems, and Lewiston Community Services District is the 4th-largest of them by population served. Its population served is about twice the county average of 347 people per system, and accounts for 4.6% of the 14,561 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active community water system reports serving 6,703 people, so Lewiston Community Services District 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. California has 2,997 active community water systems, 40% of the state's 7,479 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 609 California systems (8.1%) list surface water as their primary source.
Who owns and regulates Lewiston Community Services District?
EPA lists Lewiston Community Services District as privately owned. The CA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 27 of the 42 active systems in Trinity County (64%) are also privately owned.
Does Lewiston Community Services District have drinking water violations?
Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in March 2024. The violations listed here began between April 2013 and March 2024. By type: 9 contaminant level above the legal limit, 1 required treatment not met, 1 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminant or rule involved most often is Arsenic (9 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 |
|---|---|---|---|---|
| 2024-03-01 | Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2020-11-01 | Public notice, recordkeeping or otherRecordkeeping Violations (RTCR) · code 5B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2020-11-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2015-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2015-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2014-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2014-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2014-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2014-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2013-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2013-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2013-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | 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.
Lewiston Community Services District: frequently asked questions
Who runs Lewiston Community Services District?
Lewiston Community Services District (PWSID CA5301002) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Lewiston Community Services District serve?
Lewiston Community Services District reports serving 677 people through 234 service connections in Trinity County, California.
Where does Lewiston Community Services District 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 Lewiston Community Services District have any drinking water violations?
Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in March 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 Lewiston Community Services District'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, 10 are health-based, and the most recent began in March 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Lewiston Community Services District's water quality report?
As a community water system, Lewiston Community Services District 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 Trinity County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Weaverville C.S.D. | Trinity | 3,975 | Community | Surface water |
| Trinity Co. W.W. Dist #1 | Trinity | 2,324 | Community | Surface water |
| Trinity Center M.W.C. | Trinity | 729 | Community | Surface water |
| Clark System | Trinity | 450 | Transient non-community | Groundwater |
| Hayward Flat Campground | Trinity | 440 | Transient non-community | Groundwater |
| Tannery Gulch Campground | Trinity | 410 | Transient non-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, “Lewiston Community Services District, PWSID CA5301002, California”, https://aquacensus.com/water-systems/california/lewiston-community-services-district-ca5301002 (data as of October 1, 2026).