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Counties → California

Siskiyou County, California

SDWIS compliance plate

Sheet CA093 · Siskiyou County 72 sys · 993 viol · #1083/3254

VIOL-SEVERE · HEALTH-MID · RANK-UPPER · PHOTO-FINISH · PFAS-CLEAN · SRC-GW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 88.9% flagged
  • HEALTH-MID 38.0% health
  • RANK-UPPER #1083/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 90%
  • SYS-MID 72 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Trinity County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Siskiyou County ranks #1,083 of 3,254 counties by people served, and #48 of 58 counties in California. See methodology · corpus placement.

Siskiyou County standing, lower-flagged corpus third

Flagged-system rate 88.9% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 38.0% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #1,083 of 3,254 · #48 of 58 in California.

Flagged-rate neighbourhood around Siskiyou County

Lowest/highest poles plus in-state counties nearest Siskiyou County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Alpine · lowest Mariposa · near Trinity · near Sutter · highest 70% 88.1% 88.4% 88.9% 88.9% 89.1% 97.1%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
Yreka, City Of 7,825 5 Clean
Mt. Shasta, City Of 3,642 36 Clean
Mt. Shasta Ski Park 3,500 2 -
Lake Shastina C.s.d 2,790 14 -
Weed, City Of 2,662 21 -
Lake Siskiyou Campground 1,800 26 -
Dunsmuir, City Of 1,707 22 -
Caltrans-Collier Rest Stop 1,400 2 -
McCloud C.s.d. 1,317 35 -
Montague, City Of 1,264 23 -
Happy Camp C.s.d. 1,100 12 -
Caltrans-Weed Rest Stop 1,000 4 -
Dorris, City Of 887 13 -
Tulelake, City Of 856 8 -
Etna, City Of 720 14 -
Fort Jones, Town Of 695 25 -
Caltrans-Grass Lake Rest Stop 600 1 -
Siskiyou Lake Highlands MWC 549 5 -
Jh Ranch 403 2 -
Fowlers Campground-Stnf 360 26 -
Siskiyou Co. Rolling Hills MWC 300 13 -
R-Ranch Headquarters 300 19 -
R-Ranch Klamath River 300 15 -
Grenada Sanitary District 289 20 -
Hornbrook C.s.d. 280 47 -
Lake Siskiyou M.W.C. 277 33 -
Mdf-Medicine Lake 250 4 -
Lava Beds National Monument 245 0 -
Ash Creek Fire Station-Stnf 240 9 -
Caltrans-Dunsmuir Grade Insp. Facility 200 7 -
Kidder Creek Orchard Camp 200 3 -
Copco Lake MWC 181 32 -
Juniper Village Farm Labor Housing 170 2 -
Butteville Union School 165 4 -
Pneuma Retreat Center - Stewart Mineral 150 32 -
Monte Shasta M.W.C. 150 6 -
Doctor's Park Owners Association 150 3 -
Cal Ore Mobile Estates 146 15 -
Siskiyou Co.service Area #5/Carrick 143 12 -
Railroad Park Resort 140 0 -
Abrams Lake Mobile Estates 135 31 -
Shadow Mountain MHP 126 11 -
Weed Golf Club, Inc. 112 38 -
Sun Mountain M.W.C. 106 12 -
Cove Mobile Villa 105 31 -
Willow Creek School 100 15 -
Shasta Cascade Mobilehome Park 100 10 -
Big Springs Union Elem. School 95 9 -
McBride Springs Campground 80 2 -
Tennant C.s.d. 75 36 -

Compare beyond California

Lower-flagged peers for Siskiyou County

Cross-state counties nearest Siskiyou County on flagged-system share (88.9%) and cumulative violation count (993). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.