Humboldt, CA
Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology.
Environmental data for Humboldt in California · Population: 135,418
TRI sites such as Crystal Creamery Inc. DBA Humboldt Creamery; Pg&e Humboldt Bay Power Plant; Humboldt Sawmill Co & Cogeneration Plant; SDWIS systems such as EUREKA, CITY OF; ARCATA, CITY OF; MCKINLEYVILLE C.S.D.; NPL sites such as Celtor Chemical Works; Copper Bluff Mine anchor Humboldt, CA's EPA extract. Derived burden score 45/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Humboldt include GARBERVILLE SANITARY DISTRICT; HYDESVILLE CO. W.D.; WILLOW CREEK C.S.D., while Crystal Creamery Inc. DBA Humboldt Creamery leads reported TRI pounds among local Form R filers. AQS median AQI 38 / peak 86 in 2024.
Burden score 45/100 (Moderate Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Humboldt -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for Humboldt, CA: EPA TRI 2023 reporting year
Same facilities, both years
+18.6%
3 facilities that filed in 2022 and 2023
Whole inventory
+18.6%
149.7 thousand lb → 177.5 thousand lb, every facility that filed
- Humboldt, CA's total reported releases rose from 149.7 thousand lb in 2022 to 177.5 thousand lb in 2023, based on EPA TRI filings.
- Humboldt, CA's land releases rose from 115.9 thousand lb in 2022 to 146.1 thousand lb in 2023, based on EPA TRI filings.
- Humboldt, CA's air releases fell from 33.8 thousand lb in 2022 to 31.4 thousand lb in 2023, based on EPA TRI filings.
Air Quality History (2020–2024)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2024 | 266 (73%) | 100 | 0 | 86 |
| 2023 | 284 (78%) | 70 | 6 | 299 |
| 2022 | 340 (93%) | 25 | 0 | 74 |
| 2021 | 333 (91%) | 32 | 0 | 64 |
| 2020 | 318 (87%) | 44 | 3 | 180 |
Source: EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in California, see the EPA's AirNow.gov.
Water Systems (47)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| EUREKA, CITY OF | 27,078 | 0 |
| ARCATA, CITY OF | 20,875 | 0 |
| MCKINLEYVILLE C.S.D. | 16,900 | 0 |
| FORTUNA, CITY OF | 12,133 | 0 |
| Hoopa Valley-Wide System | 3,500 | 0 |
| RIO DELL, CITY OF | 3,300 | 0 |
| GARBERVILLE SANITARY DISTRICT | 2,041 | 3 |
| FIELDBROOK GLENDALE C.S.D. | 1,845 | 0 |
| Bear River/Singley Hill | 1,530 | 0 |
| HYDESVILLE CO. W.D. | 1,366 | 1 |
| WILLOW CREEK C.S.D. | 1,298 | 5 |
| REDWAY C.S.D. | 1,207 | 1 |
| BLUE LAKE, CITY OF | 1,172 | 0 |
| TRINIDAD, CITY OF | 1,072 | 3 |
| JACOBY CREEK CWD | 924 | 0 |
| LOLETA C.S.D. | 828 | 4 |
| RESORT IMPROVEMENT DISTRICT #1 | 803 | 2 |
| MANILA COMMUNITY SERVICES DIST. | 750 | 0 |
| SCOTIA CSD | 681 | 4 |
| Bear River - Tish Non Village | 650 | 0 |
| ORLEANS C.S.D. | 636 | 5 |
| MIRANDA C.S.D. | 492 | 0 |
| WESTHAVEN C.S.D. | 490 | 16 |
| WEOTT C.S.D. | 448 | 21 |
| ORICK C.S.D. | 396 | 0 |
| RIVERSIDE CSD | 333 | 0 |
| MYERS FLAT M.W.S. INC. | 330 | 1 |
| PALMER CREEK CSD | 320 | 1 |
| GREEN DIAMOND RESOURCE COMPANY - KORBEL | 250 | 0 |
| Table Bluff (New) Reservation | 230 | 0 |
| ALDERPOINT COUNTY WATER | 190 | 24 |
| PHILLIPSVILLE C.S.D. | 124 | 2 |
| LAS PALMAS MOBILE HOME PARK | 120 | 1 |
| REDCREST WATER WORKS | 116 | 33 |
| WISEMANS MOBILE COURT | 114 | 1 |
| BIG LAGOON CSD | 112 | 0 |
| LAKESIDE MOBILE HOME & RV PARK | 110 | 1 |
| MILL CREEK M.W.C. | 85 | 1 |
| ORLEANS MUTUAL WATER COMPANY | 85 | 17 |
| BRICELAND C.S.D. | 75 | 2 |
| WADDINGTON W.W. | 75 | 0 |
| BIG LAGOON PARK WATER CO. | 70 | 0 |
| PALOMINO ESTATES WATER COMPANY | 64 | 5 |
| SEAWOOD ESTATES MUTUAL WATER COMPANY | 63 | 10 |
| RIVERBEND MOBILE HOME PARK | 60 | 1 |
| MOONSTONE HEIGHTS MWA | 33 | 0 |
| PINE GROVE MOBILE HOME PARK | 30 | 1 |
TRI Facilities (3)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Crystal Creamery Inc. DBA Humboldt Creamery | 547.2K lbs |
| 2 | Pg&e Humboldt Bay Power Plant | 174.2K lbs |
| 3 | Humboldt Sawmill Co & Cogeneration Plant | 4 lbs |
Superfund Sites (2)
| Site Name | Status | HRS Score |
|---|---|---|
| Celtor Chemical Works | Deleted NPL Site | 30.31 |
| Copper Bluff Mine | NPL Site | 50.00 |
Cities in Humboldt (25)
Frequently Asked Questions
What is the environmental risk level in Humboldt, California? ▼
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What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.