Public water system · CA4700880
ActiveSiskiyou Lake Highlands Mwc
At a glance
Siskiyou Lake Highlands Mwc (PWSID CA4700880) is an active community water system in Siskiyou County, California. It reports serving 549 people through 94 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in January 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
549
Service connections
94
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Siskiyou Lake Highlands Mwc compare with other water systems in Siskiyou County?
By EPA's size categories, Siskiyou Lake Highlands Mwc is a small system (501 to 3,300 people). Siskiyou County has 69 active public water systems. Its population served is roughly in line with the county average of 593 people per system, and accounts for 1.3% of the 40,908 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 Siskiyou Lake Highlands Mwc 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. 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 Siskiyou Lake Highlands Mwc?
EPA lists Siskiyou Lake Highlands Mwc 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. 28 of the 69 active systems in Siskiyou County (41%) are also privately owned.
Does Siskiyou Lake Highlands Mwc have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in January 2023. The violations listed here began between July 1993 and January 2023. By type: 2 monitoring and reporting and 1 required treatment not met. The contaminants or rules involved are Revised Total Coliform Rule, Total coliform bacteria (TCR) and Lead and Copper Rule. EPA lists 3 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 |
|---|---|---|---|---|
| 2023-01-01 | Required treatment not metTreatment Technique, Level 2 Assessment (RTCR) · code 2B | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2006-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1993-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
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.
Siskiyou Lake Highlands Mwc: frequently asked questions
Who runs Siskiyou Lake Highlands Mwc?
Siskiyou Lake Highlands Mwc (PWSID CA4700880) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Siskiyou Lake Highlands Mwc serve?
Siskiyou Lake Highlands Mwc reports serving 549 people through 94 service connections in Siskiyou County, California.
Where does Siskiyou Lake Highlands Mwc 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 Siskiyou Lake Highlands Mwc have any drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in January 2023. 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 Siskiyou Lake Highlands Mwc'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 January 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Siskiyou Lake Highlands Mwc's water quality report?
As a community water system, Siskiyou Lake Highlands Mwc 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 Siskiyou County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Yreka, City of | Siskiyou | 7,825 | Community | Surface water |
| Mt. Shasta, City of | Siskiyou | 3,642 | Community | Groundwater |
| Mt. Shasta Ski Park | Siskiyou | 3,500 | Transient non-community | Groundwater |
| Lake Shastina C.S.D | Siskiyou | 2,790 | Community | Groundwater |
| Weed, City of | Siskiyou | 2,662 | Community | Groundwater |
| Lake Siskiyou Campground | Siskiyou | 1,800 | Transient non-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, “Siskiyou Lake Highlands Mwc, PWSID CA4700880, California”, https://aquacensus.com/water-systems/california/siskiyou-lake-highlands-mwc-ca4700880 (data as of October 1, 2026).