Siskiyou County, California — public water systems
At a glance
69 active public water systems are filed under Siskiyou County, California in EPA's SDWIS records, together reporting 40,908 people served. The largest is City of Yreka, which reports serving 7,825 people. 30 are community water systems serving people where they live; the other 39 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
69
Population served
40.9K
Community systems
30
Groundwater share
89.9%
How does Siskiyou County compare with other California counties?
Siskiyou County has the 37th-most active public water systems among the 201 counties listed for active California systems in EPA records; among the 72 with 3 or more systems, the median has 73. Its systems report 40,908 people served in total, the 48th-largest county figure in the state and less than 0.1% of the statewide total. The average system here reports serving 593 people, well below the California average of 5,706. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Siskiyou County's drinking water come from?
By primary water source, Siskiyou County's active systems draw on groundwater (62, 90%) and surface water (7, 10%). Overall, 90% rely mainly on groundwater (including purchased groundwater) and 10% on surface water, compared with 85% and 15% across California. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, City of Yreka, draws primarily on surface water.
What kinds of water systems operate in Siskiyou County?
Siskiyou County's active systems break down as 30 community systems (43%), 9 non-transient non-community systems (13%) and 30 transient non-community systems (43%). 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. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (41%), local government (30%), federal government (22%) and state government (7.2%).
The 50 largest water systems in Siskiyou County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Yreka, City of | Siskiyou | 7,825 | Community | Surface water |
| 2 | Mt. Shasta, City of | Siskiyou | 3,642 | Community | Groundwater |
| 3 | Mt. Shasta Ski Park | Siskiyou | 3,500 | Transient non-community | Groundwater |
| 4 | Lake Shastina C.S.D | Siskiyou | 2,790 | Community | Groundwater |
| 5 | Weed, City of | Siskiyou | 2,662 | Community | Groundwater |
| 6 | Lake Siskiyou Campground | Siskiyou | 1,800 | Transient non-community | Surface water |
| 7 | Dunsmuir, City of | Siskiyou | 1,707 | Community | Groundwater |
| 8 | Caltrans-Collier Rest Stop | Siskiyou | 1,400 | Transient non-community | Surface water |
| 9 | Mccloud C.S.D. | Siskiyou | 1,317 | Community | Groundwater |
| 10 | Montague, City of | Siskiyou | 1,264 | Community | Surface water |
| 11 | Happy Camp C.S.D. | Siskiyou | 1,100 | Community | Surface water |
| 12 | Caltrans-Weed Rest Stop | Siskiyou | 1,000 | Transient non-community | Groundwater |
| 13 | Dorris, City of | Siskiyou | 887 | Community | Groundwater |
| 14 | Tulelake, City of | Siskiyou | 856 | Community | Groundwater |
| 15 | Etna, City of | Siskiyou | 720 | Community | Surface water |
| 16 | Fort Jones, Town of | Siskiyou | 695 | Community | Groundwater |
| 17 | Caltrans-Grass Lake Rest Stop | Siskiyou | 600 | Transient non-community | Groundwater |
| 18 | Siskiyou Lake Highlands Mwc | Siskiyou | 549 | Community | Groundwater |
| 19 | Jh Ranch | Siskiyou | 403 | Transient non-community | Groundwater |
| 20 | Fowlers Campground-Stnf | Siskiyou | 360 | Transient non-community | Groundwater |
| 21 | R-Ranch Klamath River | Siskiyou | 300 | Transient non-community | Groundwater |
| 22 | Siskiyou Co. Rolling Hills Mwc | Siskiyou | 300 | Community | Groundwater |
| 23 | R-Ranch Headquarters | Siskiyou | 300 | Transient non-community | Groundwater |
| 24 | Grenada Sanitary District | Siskiyou | 289 | Community | Groundwater |
| 25 | Hornbrook C.S.D. | Siskiyou | 280 | Community | Groundwater |
| 26 | Lake Siskiyou M.W.C. | Siskiyou | 277 | Community | Groundwater |
| 27 | Mdf-Medicine Lake | Siskiyou | 250 | Transient non-community | Groundwater |
| 28 | Lava Beds National Monument | Siskiyou | 245 | Transient non-community | Groundwater |
| 29 | Ash Creek Fire Station-Stnf | Siskiyou | 240 | Transient non-community | Groundwater |
| 30 | Caltrans-Dunsmuir Grade Insp. Facility | Siskiyou | 200 | Non-transient non-community | Groundwater |
| 31 | Kidder Creek Orchard Camp | Siskiyou | 200 | Transient non-community | Groundwater |
| 32 | Juniper Village Farm Labor Housing | Siskiyou | 170 | Transient non-community | Groundwater |
| 33 | Butteville Union School | Siskiyou | 165 | Non-transient non-community | Groundwater |
| 34 | Pneuma Retreat Center - Stewart Mineral | Siskiyou | 150 | Transient non-community | Groundwater |
| 35 | Doctor'S Park Owners Association | Siskiyou | 150 | Non-transient non-community | Groundwater |
| 36 | Monte Shasta M.W.C. | Siskiyou | 150 | Community | Groundwater |
| 37 | Cal Ore Mobile Estates | Siskiyou | 146 | Community | Groundwater |
| 38 | Siskiyou Co.Service Area #5/Carrick | Siskiyou | 143 | Community | Groundwater |
| 39 | Jubilee Railroad Wilderness Lodge | Siskiyou | 140 | Transient non-community | Groundwater |
| 40 | Abrams Lake Mobile Estates | Siskiyou | 135 | Community | Groundwater |
| 41 | Shadow Mountain MHP | Siskiyou | 126 | Community | Groundwater |
| 42 | Weed Golf Club, Inc.. | Siskiyou | 112 | Transient non-community | Groundwater |
| 43 | Sun Mountain M.W.C. | Siskiyou | 106 | Community | Groundwater |
| 44 | Cove Mobile Villa | Siskiyou | 105 | Community | Groundwater |
| 45 | Willow Creek School | Siskiyou | 100 | Non-transient non-community | Groundwater |
| 46 | Big Springs Union Elem. School | Siskiyou | 95 | Non-transient non-community | Groundwater |
| 47 | Mcbride Springs Campground | Siskiyou | 80 | Transient non-community | Groundwater |
| 48 | Tennant C.S.D. | Siskiyou | 75 | Community | Groundwater |
| 49 | Callahan Water District | Siskiyou | 70 | Community | Surface water |
| 50 | Cal Fire-Deadwood Conservation Camp | Siskiyou | 65 | Non-transient non-community | Groundwater |
All other water systems in Siskiyou County (19)
The remaining active systems filed under Siskiyou County, largest first, with the population each reports serving.
- Gazelle School60
- Shasta Horizon Mobile Home Park55
- Dollar General Store - Weed50
- Delphic Elementary School50
- Shasta View Heights Owners Association48
- Junction Elementary School40
- Shastina Mobile Estates32
- Oak Bottom Cg & Wc32
- Mt. Hebron Work Center30
- Sawyer S Bar Work Center30
- Juanita Lake Campground30
- Klamath Basin National Wildlife Refuge30
- Dillon Creek Campground-Srnf30
- Swiss Holiday Lodge25
- Cold Creek Mutual Water Company25
- Kangaroo Lake Campground25
- Indian Scotty Campground25
- Tree of Heaven Campground25
- Oak Knoll Work Center25
Siskiyou County water systems: frequently asked questions
How many public water systems are in Siskiyou County, California?
EPA's SDWIS records file 69 active public water systems under Siskiyou County, California: 30 community systems (43%), 9 non-transient non-community systems (13%) and 30 transient non-community systems (43%).
Who supplies drinking water in Siskiyou County, CA?
The largest community water systems filed under Siskiyou County are City of Yreka (7,825 people served), City of Mt. Shasta (3,642 people served) and Lake Shastina C.S.D (2,790 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Siskiyou County's drinking water come from groundwater or surface water?
Of the 69 active public water systems in Siskiyou County, 90% draw mainly on groundwater and 10% on surface water, counting purchased supplies. The largest system, City of Yreka, uses surface water.
Where can I find a water quality report for Siskiyou County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 30 community systems are filed under Siskiyou County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Siskiyou County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More California water systems
- All California public water systems· 7,479 active
- Mono County· 84 systems
- Nevada County· 82 systems
- Lake County· 81 systems
- Imperial County· 76 systems
- Amador County· 67 systems
- Mariposa County· 67 systems
- How to find out who supplies your drinking water
- How to find and read your annual water quality report
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, “Public water systems in Siskiyou County, California”, https://aquacensus.com/water-systems/california/siskiyou (data as of October 1, 2026).