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Counties → California

Humboldt County, California

SDWIS compliance plate

Sheet CA023 · Humboldt County 91 sys · 2,001 viol · #460/3254

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

  • VIOL-SEVERE 93.4% flagged
  • HEALTH-MID 34.0% health
  • RANK-TOP #460/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 60%
  • SYS-MID 91 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Riverside County (+ 0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Humboldt County ranks #460 of 3,254 counties by people served, and #35 of 58 counties in California. See methodology · corpus placement.

Humboldt County standing, mid-flagged corpus third

Flagged-system rate 93.4% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 34.0% 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 #460 of 3,254 · #35 of 58 in California.

Flagged-rate neighbourhood around Humboldt County

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

0% 20% 40% 60% 80% 100% Alpine · lowest San Joaquin · near Riverside · near Sutter · highest 70% 93.1% 93.2% 93.4% 93.5% 93.8% 97.1%

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

Water Systems

System Name Population Violations PFAS
Eureka, City Of 27,078 2 Clean
Arcata, City Of 20,875 2 Clean
Humboldt C.s.d. 19,807 7 Clean
McKinleyville C.s.d. 16,900 8 Clean
Fortuna, City Of 12,133 5 Clean
Rio Dell, City Of 3,300 6 Clean
Garberville Sanitary District 2,041 4 -
Fieldbrook Glendale C.s.d. 1,845 3 -
Del Oro Water Co-Ferndale 1,662 0 -
Richardson Grove Sp-State Parks 1,509 5 -
Hydesville Co. W.D. 1,366 20 -
Willow Creek C.s.d. 1,298 7 -
Redway C.s.d. 1,207 7 -
Blue Lake, City Of 1,172 2 Clean
Trinidad, City Of 1,072 25 -
Caltrans-Trinidad Nb 1,000 5 -
Sue-Meg Sp-State Parks 1,000 5 -
Gold Bluffs Beach Cg-State Parks 998 2 -
Jacoby Creek Cwd 924 4 -
Scotia Csd 906 14 -
Loleta C.s.d. 828 5 -
Resort Improvement District #1 803 7 -
Richardson Grove Campground & RV Park 750 41 -
Manila Community Services Dist. 750 3 -
Humboldt Bay MWD 680 2 -
Orleans C.s.d. 636 41 -
Van Duzen - Humboldt Co. Parks 551 2 -
Prairie Creek Sp-State Parks 500 0 -
Miranda C.s.d. 492 9 -
Westhaven C.s.d. 490 23 -
Weott C.s.d. 448 70 -
Stone Lagoon-State Parks 402 5 -
Orick C.s.d. 396 15 -
Benbow-Del Oro W.C. 370 42 -
Burlington Cg-State Parks 368 2 -
Hidden Springs Cg-State Parks 350 0 -
Riverside Csd 333 20 -
Myers Flat M.w.s. Inc. 330 33 -
Palmer Creek Csd 320 14 -
A W Way - Humboldt Co. Parks 301 7 -
Phillipsville C.s.d. 300 69 -
Angelina 300 24 -
Big Lagoon - Humboldt Co. Parks 300 0 -
Dean Creek Resort 283 8 -
Cal Fire-Eel River Conservation Camp 280 33 -
Green Diamond Resource Company - Korbel 250 5 -
Larrupin Cafe 247 57 -
Sylvan Harbor Trailer Park 231 12 -
Emerald Forest 200 24 -
Chimney Tree 200 38 -

Compare beyond California

Mid-flagged peers for Humboldt County

Cross-state counties nearest Humboldt County on flagged-system share (93.4%) and cumulative violation count (2,001). 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.