Tapcensus

California

Siskiyou County drinking water quality

72 active public water systems serve 40,976 people in Siskiyou County. 42 are compliant, 30 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 16 carry a health flag.

Active systems 72 32 community systems
People served 41K by public water systems
Systems with violations 30 42% of active systems, past 3 years
Serious violators 1 16 systems carry a health flag

Needs attention

Siskiyou Co.service Area #5/carrick CA4700521 · Community water system · Serves 143 2 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Yreka, City of CA4710011 · Yreka · Community water system · Serves 7,879 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Mt. Shasta, City of CA4710008 · Mount Shasta · Community water system · Serves 3,642 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Lake Shastina C.s.d CA4710013 · Community water system · Serves 2,790 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
McCloud C.s.d. CA4710006 · Community water system · Serves 1,317 3 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Montague, City of CA4710007 · Montague · Community water system · Serves 1,264 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Happy Camp C.s.d. CA4710012 · Community water system · Serves 1,100 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Tulelake, City of CA4710010 · Tulelake · Community water system · Serves 925 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Dorris, City of CA4710001 · Dorris · Community water system · Serves 887 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Hornbrook C.s.d. CA4700513 · Community water system · Serves 280 2 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).

6 more systems with a serious violator or health flag designation are in the lists below.

Community water systems

32 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Yreka, City of
Yreka 		7,879 1 1
Mt. Shasta, City of
Mount Shasta 		3,642 1 1
Lake Shastina C.s.d
 2,790 1 1
Weed, City of
Weed 		2,662 2 2
Dunsmuir, City of
Dunsmuir 		1,707 2 1
McCloud C.s.d.
 1,317 3 2
Montague, City of
Montague 		1,264 1 1
Happy Camp C.s.d.
 1,100 1 1
Tulelake, City of
Tulelake 		925 1 1
Dorris, City of
Dorris 		887 1 1
Etna, City of
Etna 		720 1 1
Fort Jones, Town of
 673 0 0
Siskiyou Lake Highlands Mwc
 310 1 1
Siskiyou Co. Rolling Hills Mwc
 300 0 0
Grenada Sanitary District
 289 1 1
Lake Siskiyou M.w.c.
 281 0 0
Hornbrook C.s.d.
 280 2 1
Copco Lake Mwc
 181 2 2
Monte Shasta M.w.c.
 150 0 0
Cal Ore Mobile Estates
 146 0 0
Siskiyou Co.service Area #5/carrick
 143 2 2
Abrams Lake Mobile Estates
 135 1 1
Shadow Mountain MHP
 126 1 1
Sun Mountain M.w.c.
 109 0 0
Cove Mobile Villa
 105 1 1
Shasta Cascade Mobilehome Park
 100 1 1
Callahan Water District
 70 1 1
Cold Creek Mutual Water Company
 63 0 0
Shasta Horizon Mobile Home Park
 55 0 0
Tennant C.s.d.
 50 1 1
Shasta View Heights Owners Association
 48 1 1
Shastina Mobile Estates
 32 1 1
Non-community systems (40: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Mt. Shasta Ski Park
 3,500 0 0
Lake Siskiyou Campground
 1,850 0 0
Caltrans-Collier Rest Stop
 1,400 0 0
Caltrans-Weed Rest Stop
 1,000 0 0
Caltrans-Grass Lake Rest Stop
 600 0 0
JH Ranch
 403 0 0
Fowlers Campground-Stnf
 360 0 0
R-Ranch Headquarters
 300 0 0
R-Ranch Klamath River
 300 0 0
Mdf-Medicine Lake
 250 0 0
Lava Beds National Monument
 245 0 0
Ash Creek Fire Station-Stnf
 240 0 0
Kidder Creek Orchard Camp
 200 0 0
Doctor's Park Owners Association
 175 0 0
Juniper Village Farm Labor Housing
Dorris 		170 1 0
Butteville Union School
 165 0 0
Pneuma Retreat Center Stewart Mineral
 150 0 0
Jubilee Railroad Wilderness Lodge
 115 0 0
Weed Golf Club, Inc.
 112 0 0
Willow Creek School
 100 2 1
Big Springs Union Elem. School
 95 2 2
McBride Springs Campground
 80 0 0
Cal Fire-Deadwood Conservation Camp
 65 1 1
Gazelle School
 60 1 1
Delphic Elementary School
 50 0 0
Dollar General Store Weed
Weed 		50 0 0
Junction Elementary School
 40 0 0
Oak Bottom CG & WC
 32 0 0
Dillon Creek Campground-Srnf
 30 0 0
Juanita Lake Campground
 30 0 0
Klamath Basin National Wildlife Refuge
 30 1 0
Little Shasta School
 30 0 0
Mt. Hebron Work Center
 30 0 0
Sawyer S Bar Work Center
 30 0 0
Caltrans-Dunsmuir Grade Cvef
 25 0 0
Indian Scotty Campground
 25 0 0
Kangaroo Lake Campground
 25 0 0
Oak Knoll Work Center
 25 0 0
Swiss Holiday Lodge
 25 0 0
Tree of Heaven Campground
 25 0 0
Inactive systems (210, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.