Public water system · CA4510007
ActiveCottonwood Water District
At a glance
Cottonwood Water District (PWSID CA4510007) is an active community water system in Shasta County, California. It reports serving 3,316 people through 1,235 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,316
Service connections
1,235
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Cottonwood Water District compare with other water systems in Shasta County?
By EPA's size categories, Cottonwood Water District is a medium system (3,301 to 10,000 people). Shasta County has 174 active public water systems. Its population served is about 174% above the county average of 1,208 people per system, and accounts for 1.6% of the 210,209 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 Cottonwood Water District is about half of 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,179 California systems (83%) list groundwater as their primary source.
Who owns and regulates Cottonwood Water District?
EPA lists Cottonwood Water District as owned by a local government. 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. 31 of the 174 active systems in Shasta County (18%) are also owned by a local government.
Does Cottonwood Water District have drinking water violations?
EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in October 2025. The violations listed here began between September 1994 and October 2025. By type: 2 monitoring and reporting, 2 required treatment not met, 2 contaminant level above the legal limit and 1 reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 6 as resolved and 1 as addressed. 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. Addressed means the violation is not resolved or archived and is covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Addressed |
| 2024-10-17 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Resolved |
| 2024-10-17 | ReportingLSL Reporting · code 4G | Lead and Copper Rule Revisionscode 5200 | No | Resolved |
| 2018-08-01 | Required treatment not metTreatment Technique, Level 1 Assessment (RTCR) · code 2A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2004-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1995-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1994-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 7 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.
Cottonwood Water District: frequently asked questions
Who runs Cottonwood Water District?
Cottonwood Water District (PWSID CA4510007) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Cottonwood Water District serve?
Cottonwood Water District reports serving 3,316 people through 1,235 service connections in Shasta County, California.
Where does Cottonwood Water District 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 Cottonwood Water District have any drinking water violations?
EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in October 2025. 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 Cottonwood Water 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. EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Cottonwood Water District's water quality report?
As a community water system, Cottonwood Water 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 Shasta County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Redding | Shasta | 89,628 | Community | Surface water |
| Bella Vista Water District | Shasta | 18,612 | Community | Surface water |
| City of Anderson | Shasta | 11,147 | Community | Groundwater |
| City of Shasta Lake | Shasta | 10,657 | Community | Surface water |
| Shasta District Fair | Shasta | 10,200 | Transient non-community | Groundwater |
| Clear Creek Csd-Anderson | Shasta | 8,900 | 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, “Cottonwood Water District, PWSID CA4510007, California”, https://aquacensus.com/water-systems/california/cottonwood-water-district-ca4510007 (data as of October 1, 2026).