Public water system · CA1210016
ActiveMckinleyville C.S.D.
At a glance
Mckinleyville C.S.D. (PWSID CA1210016) is an active community water system in Humboldt County, California. It reports serving 16,900 people through 5,969 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in October 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
16,900
Service connections
5,969
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Mckinleyville C.S.D. compare with other water systems in Humboldt County?
By EPA's size categories, Mckinleyville C.S.D. is a large system (10,001 to 100,000 people). Humboldt County has 90 active public water systems, and Mckinleyville C.S.D. is the 4th-largest of them by population served. Its population served is about 11 times the county average of 1,486 people per system, and accounts for 13% of the 133,779 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 Mckinleyville C.S.D. is about 152% above 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. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 76 California systems (1%) list purchased groundwater as their primary source.
Who owns and regulates Mckinleyville C.S.D.?
EPA lists Mckinleyville C.S.D. 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. 33 of the 90 active systems in Humboldt County (37%) are also owned by a local government.
Does Mckinleyville C.S.D. have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in October 2022. The violations listed here began between March 1984 and October 2022. By type: 1 monitoring and reporting, 1 required treatment not met and 1 public notice, recordkeeping or other. The contaminants or rules involved are Lead and Copper Rule and Surface Water Treatment Rule. EPA lists 2 as resolved and 1 as archived. 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. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2022-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1993-06-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1984-03-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
All 3 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.
Mckinleyville C.S.D.: frequently asked questions
Who runs Mckinleyville C.S.D.?
Mckinleyville C.S.D. (PWSID CA1210016) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Mckinleyville C.S.D. serve?
Mckinleyville C.S.D. reports serving 16,900 people through 5,969 service connections in Humboldt County, California.
Where does Mckinleyville C.S.D. get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Mckinleyville C.S.D. have any drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in October 2022. 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 Mckinleyville C.S.D.'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 3 violations for this system; 1 is health-based, and the most recent began in October 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Mckinleyville C.S.D.'s water quality report?
As a community water system, Mckinleyville C.S.D. 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 Humboldt County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Eureka, City of | Humboldt | 27,078 | Community | Purchased groundwater |
| Arcata, City of | Humboldt | 20,875 | Community | Purchased groundwater |
| Humboldt C.S.D. | Humboldt | 19,807 | Community | Groundwater |
| Fortuna, City of | Humboldt | 12,133 | Community | Groundwater |
| Rio Dell, City of | Humboldt | 3,300 | Community | Surface water |
| Garberville Sanitary District | Humboldt | 2,041 | 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, “Mckinleyville C.S.D., PWSID CA1210016, California”, https://aquacensus.com/water-systems/california/mckinleyville-c-s-d-ca1210016 (data as of October 1, 2026).