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Counties → California

Trinity County, California

SDWIS compliance plate

Sheet CA105 · Trinity County 45 sys · 601 viol · #2026/3254

VIOL-SEVERE · HEALTH-MID · RANK-LOWER · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 88.9% flagged
  • HEALTH-MID 43.6% health
  • RANK-LOWER #2026/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-HIGH 100.0% detect
  • SRC-GW GW lead 64%
  • SYS-MID 45 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Trinity County ranks #2,026 of 3,254 counties by people served, and #56 of 58 counties in California. See methodology · corpus placement.

Trinity 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 43.6% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 100.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #2,026 of 3,254 · #56 of 58 in California.

Flagged-rate neighbourhood around Trinity County

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

0% 20% 40% 60% 80% 100% Alpine · lowest Mariposa · near Siskiyou · 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
Weaverville C.s.d. 3,975 6 Detected
Trinity Co. W.w. Dist #1 2,324 11 -
Trinity Center M.W.C. . 729 11 -
Lewiston Community Services District 677 84 -
Clark System 450 6 -
Hayward Flat Campground 440 0 -
Tannery Gulch Campground 410 4 -
Caltrans-Salyer Safety Rest Stop 400 2 -
Trinity Knolls Mutual Water Company 338 18 -
Trinity Village Mutual Water 332 11 -
Fawn & Stoney Campground 327 0 -
Trinity Lake Marinas, LLC. 317 8 -
Trinity Alps Resort 307 5 -
Fish Tail Inn 274 20 -
Ruth Lake Recreation Area 252 6 -
Salyer Mutual WC (Formerly Riverview Ac) 231 66 -
Pinewood Cove Resort 230 0 -
Pine Cove RV Park 223 16 -
Alpine View Campground 215 0 -
Ruth Lake Marina 202 2 -
Bridge Camp 190 2 -
Del Loma RV Park & Cg 157 11 -
Bar 717 Ranch 145 12 -
Treasure Creek Woods MWC 131 10 -
Salyer Heights W.S., Inc 130 36 -
Burnt Ranch School 125 11 -
Cal Fire-Trinity River Conservation Camp 120 6 -
Burnt Ranch Estates 115 11 -
Journey S End Resort 106 4 -
Rush Creek Mutual Water System 102 5 -
Ackerman Campground 100 2 -
So Trinity Unified School Dist. 100 10 -
Covington Mill MWC-Division B 99 15 -
Mary Smith Campground 90 0 -
Junction City School 80 18 -
Lakeview Terrace Resort 79 12 -
Redding Odd Fellows Camp 65 13 -
Mad River Compound - Usfs 61 7 -
Covington Mill - A 60 14 -
Indian Creek Trailer Park 43 31 -
Bucktail Mutual Water Company 42 23 -
Seymour's Mutual Water System 40 32 -
Bud Fine MWC 37 25 -
Flux River Resort 34 14 -
Southern Trinity Health Services, Inc. 30 1 -

Compare beyond California

Lower-flagged peers for Trinity County

Cross-state counties nearest Trinity County on flagged-system share (88.9%) and cumulative violation count (601). 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.