Public water system · CA4700686
ActiveSun Mountain M.W.C.
At a glance
Sun Mountain M.W.C. (PWSID CA4700686) is an active community water system in Siskiyou County, California. It reports serving 106 people through 32 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 7 violations for this system; 5 are health-based, and the most recent began in October 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
106
Service connections
32
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Sun Mountain M.W.C. compare with other water systems in Siskiyou County?
By EPA's size categories, Sun Mountain M.W.C. is a very small system (500 people or fewer). Siskiyou County has 69 active public water systems. Its population served is well below the county average of 593 people per system, and accounts for 0.3% 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 Sun Mountain M.W.C. 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 Sun Mountain M.W.C.?
EPA lists Sun Mountain M.W.C. 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 Sun Mountain M.W.C. have drinking water violations?
EPA's records list 7 violations for this system; 5 are health-based, and the most recent began in October 2019. The violations listed here began between July 1993 and October 2019. By type: 5 contaminant level above the legal limit and 2 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2019-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2014-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2005-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1997-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1996-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | 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.
Sun Mountain M.W.C.: frequently asked questions
Who runs Sun Mountain M.W.C.?
Sun Mountain M.W.C. (PWSID CA4700686) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Sun Mountain M.W.C. serve?
Sun Mountain M.W.C. reports serving 106 people through 32 service connections in Siskiyou County, California.
Where does Sun Mountain M.W.C. 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 Sun Mountain M.W.C. have any drinking water violations?
EPA's records list 7 violations for this system; 5 are health-based, and the most recent began in October 2019. 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 Sun Mountain M.W.C.'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; 5 are health-based, and the most recent began in October 2019. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Sun Mountain M.W.C.'s water quality report?
As a community water system, Sun Mountain M.W.C. 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 |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Sun Mountain M.W.C., PWSID CA4700686, California”, https://aquacensus.com/water-systems/california/sun-mountain-m-w-c-ca4700686 (data as of October 1, 2026).