Sonoma, 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 Sonoma in California · Population: 485,642
TRI sites such as Lgc Biosearch Technologies Inc; Keysight Technologies Inc; Clover Stornetta Farms Inc; SDWIS systems such as SANTA ROSA, CITY OF; PETALUMA, CITY OF; ROHNERT PARK, CITY OF; NPL sites such as MGM Brakes; Sola Optical USA, Inc. anchor Sonoma, CA's EPA extract. Derived burden score 52/100 (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 Sonoma include SONOMA STATE UNIVERSITY; CLOVERDALE, CITY OF; CALISTOGA, CITY OF, while Lgc Biosearch Technologies Inc leads reported TRI pounds among local Form R filers. AQS median AQI 19 / peak 72 in 2024.
Burden score 52/100 (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 Sonoma -- 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 Sonoma, CA: EPA TRI 2023 reporting year
Same facilities, both years
+27.8%
8 facilities that filed in 2022 and 2023
Whole inventory
+32.5%
35.2 thousand lb → 46.7 thousand lb, every facility that filed
Between the two reporting years, 3 facilities filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Sonoma, CA's total reported releases rose from 35.2 thousand lb in 2022 to 45.0 thousand lb in 2023, based on EPA TRI filings.
- Sonoma, CA's air releases rose from 17.8 thousand lb in 2022 to 27.9 thousand lb in 2023, based on EPA TRI filings.
- Sonoma, CA's off-site transfers fell from 17.4 thousand lb in 2022 to 17.1 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 | 348 (95%) | 18 | 0 | 72 |
| 2023 | 323 (88%) | 40 | 2 | 117 |
| 2022 | 286 (78%) | 79 | 0 | 82 |
| 2021 | 283 (78%) | 82 | 0 | 89 |
| 2020 | 290 (79%) | 69 | 1 | 199 |
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 (111)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| SANTA ROSA, CITY OF | 175,396 | 0 |
| PETALUMA, CITY OF | 60,781 | 0 |
| ROHNERT PARK, CITY OF | 43,821 | 0 |
| WINDSOR, TOWN OF | 25,561 | 0 |
| SONOMA, CITY OF | 11,725 | 0 |
| SONOMA STATE UNIVERSITY | 10,986 | 1 |
| HEALDSBURG, CITY OF | 10,985 | 0 |
| CLOVERDALE, CITY OF | 10,398 | 2 |
| SEBASTOPOL, CITY OF | 7,522 | 0 |
| COTATI, CITY OF | 7,303 | 0 |
| SWEETWATER SPRINGS CWD - GUERNEVILLE | 6,000 | 0 |
| CALISTOGA, CITY OF | 5,610 | 37 |
| RUSSIAN RIVER COUNTY WATER DISTRICT | 4,150 | 0 |
| FORESTVILLE WATER DISTRICT | 3,788 | 0 |
| SWEETWATER SPRINGS CWD - MONTE RIO | 3,000 | 0 |
| PENNGROVE WATER COMPANY (PUC) | 1,742 | 0 |
| SONOMA COUNTY CSA 41-FITCH MOUNTAIN | 1,265 | 0 |
| CAMP MEEKER WATER SYSTEM | 1,171 | 0 |
| SEA RANCH WATER COMPANY,THE (PUC) | 1,160 | 1 |
| BODEGA BAY PUBLIC UTILITY DISTRICT | 1,069 | 0 |
| KENWOOD VILLAGE WATER COMPANY (PUC) | 1,029 | 0 |
| CANON MANOR WATER SYSTEM | 805 | 0 |
| ODD FELLOWS RECREATION CLUB | 757 | 0 |
| MOON VALLEY WATER SYSTEM | 691 | 0 |
| DIAMOND A MUTUAL WATER COMPANY | 640 | 1 |
| Lytton Rancheria Water System | 600 | 0 |
| OCCIDENTAL COMMUNITY SERVICES DISTRICT | 533 | 0 |
| CAZADERO WATER COMPANY, INC. (PUC) | 525 | 8 |
| WILLOWSIDE MUTUAL WATER COMPANY | 448 | 0 |
| BENNETT RIDGE MUTUAL WATER COMPANY | 439 | 0 |
| SERENO DEL MAR WATER COMPANY (PUC) | 435 | 0 |
| SONOMA COUNTY CSA 41-SALMON CREEK | 427 | 0 |
| ALLIANCE REDWOODS CONFERENCE GROUNDS | 418 | 0 |
| LEISURE MOBILE HOME PARK | 410 | 0 |
| SONOMA COUNTY CSA 41-JENNER | 406 | 18 |
| HEIGHTS MUTUAL WATER COMPANY | 363 | 0 |
| COLONIAL PARK | 342 | 0 |
| BRANGER MUTUAL WATER COMPANY, INC. | 300 | 2 |
| HOLLAND HEIGHTS MUTUAL WATER COMPANY | 300 | 0 |
| PALOMINO LAKES MUTUAL WATER CO. | 300 | 0 |
| GILL CREEK MUTUAL WATER COMPANY | 290 | 0 |
| SONOMA COUNTY CSA 41-FREESTONE | 290 | 4 |
| CARMET BY THE SEA WATER COMPANY | 288 | 0 |
| BELMONT TERRACE MUTUAL WATER COMPANY | 287 | 0 |
| TIMBER COVE COUNTY WATER DISTRICT | 271 | 2 |
| HAPPY ACRES MUTUAL BENEFIT WATER SYSTEM | 260 | 0 |
| COLLEGE PARK MUTUAL WATER COMPANY | 244 | 0 |
| NORTH STAR MOBILE HOME PARK | 221 | 0 |
| LAWNDALE MUTUAL WATER COMPANY | 218 | 0 |
| MOBILE HOME ESTATES | 210 | 1 |
| RAINS CREEK WATER DISTRICT | 208 | 0 |
| JAMES COURT WATER SYSTEM | 208 | 1 |
| TUCKER ACRES MUTUAL WATER CO. | 200 | 0 |
| RANDAL'S RANCHETTE MUTUAL WATER COMPANY | 200 | 1 |
| YULUPA MUTUAL WATER COMPANY | 200 | 0 |
| EL PORTAL MOBILE ESTATES | 200 | 10 |
| CASPAR SOUTH SERVICE COMPANY | 188 | 0 |
| SHAMROCK MOBILE HOME PARK | 188 | 0 |
| SONOMA MOUNTAIN COUNTY WATER DISTRICT | 181 | 0 |
| RIO LINDO ADVENTIST ACADEMY | 178 | 0 |
| Kashia | 153 | 9 |
| MISSION HIGHLANDS MUTUAL WATER CO. | 150 | 0 |
| RIEBLI MUTUAL WATER COMPANY | 150 | 0 |
| AUSTIN CREEK MUTUAL (SPRINGHILL) | 150 | 0 |
| KELLY MUTUAL WATER COMPANY | 135 | 1 |
| END-O-VALLEY MUTUAL WATER COMPANY | 129 | 0 |
| DOWNTOWN GRATON MUTUAL WATER SYSTEM | 115 | 0 |
| SUNRISE MOUNTAIN MUTUAL WATER COMPANY | 100 | 0 |
| HILTON MUTUAL WATER COMPANY | 100 | 0 |
| MICHELE MUTUAL WATER COMPANY | 93 | 0 |
| SOUTH CLOVERDALE WATER COMPANY | 90 | 1 |
| VALLEY FORD WATER ASSOCIATION | 88 | 109 |
| RUSSIAN RIVER MUTUAL WATER CO. | 87 | 0 |
| AUSTIN ACRES MUTUAL WATER COMPANY | 82 | 0 |
| WENDELL LANE MUTUAL WATER COMPANY | 82 | 0 |
| RAMBLING HILLS ESTATES | 78 | 0 |
| BODEGA WATER COMPANY | 77 | 5 |
| MADRONE MUTUAL WATER COMPANY | 76 | 0 |
| PARK ROYAL MUTUAL WATER COMPANY | 75 | 2 |
| BEACH CREEK MOBILE HOME PARK | 67 | 6 |
| BLUE LAKES VILLAGE | 65 | 0 |
| LONE PINE MUTUAL WATER COMPANY | 65 | 0 |
| MELITA HEIGHTS MUTUAL WATER COMPANY | 64 | 0 |
| MARK WEST ACRES MWC | 61 | 0 |
| BOULEVARD HEIGHTS MUTUAL WATER | 60 | 0 |
| TERRACE VIEW WATER SYSTEM | 60 | 0 |
| SONOMA SPRINGS | 59 | 0 |
| DELORES LANE WATER SYSTEM | 59 | 3 |
| LICHAU HYLANDS MUTUAL WATER COMPANY | 56 | 0 |
| ATHENA TERRACE MUTUAL WATER COMPANY | 50 | 0 |
| GRATON MUTUAL WATER SYSTEM | 50 | 0 |
| KINNYBROOK MUTUAL WATER COMPANY | 48 | 0 |
| HUCKLEBERRY MUTUAL WATER COMPANY | 45 | 0 |
| SUMMIT VIEW RANCH MUTUAL WATER CO. | 45 | 0 |
| INDIAN CREEK TRAILER PARK | 43 | 4 |
| BRANSCOMB MOBILE HOME PARK | 42 | 2 |
| VINEHILL VISTAS MUTUAL WATER COMPANY | 42 | 0 |
| CLEAR CREEK WATER COMPANY | 40 | 0 |
| WEST WATER COMPANY (PUC) | 40 | 0 |
| CRYSTALS | 40 | 0 |
| EVERGREEN RETREAT MHP | 39 | 2 |
| CORBY AVENUE APARTMENTS | 38 | 0 |
| ODIYAN BUDDHIST RETREAT CENTER | 35 | 0 |
| LARKIN WOODS MUTUAL WATER COMPANY | 34 | 0 |
| REDWOOD HEIGHTS MUTUAL WATER COMPANY | 30 | 1 |
| ALEXANDER VALLEY ACRES WATER COMPANY | 27 | 0 |
| PINE HILL TERRACE MOBILE HOME PARK | 27 | 0 |
| LOCH HAVEN MUTUAL WATER COMPANY | 26 | 36 |
| ROLLING OAKS ROAD ASSOCIATION | 25 | 0 |
| MARK WEST MEADOWS MUTUAL WATER | 20 | 1 |
| SONOMA COUNTY WATER AGENCY | 0 | 0 |
TRI Facilities (14)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Lgc Biosearch Technologies Inc | 64.0K lbs |
| 2 | Keysight Technologies Inc | 55.9K lbs |
| 3 | Clover Stornetta Farms Inc | 25.9K lbs |
| 4 | Nick Barbieri Trucking LLC | 13.7K lbs |
| 5 | U.S. Coast Guard Training Center Petaluma | 1.3K lbs |
| 6 | Northgate Ready Mix | 1.2K lbs |
| 7 | Perdue Foods LLC - Petaluma Poultry Processing Plant | 520 lbs |
| 8 | Itt Cannon LLC DBA Biw Connector Systems | 341 lbs |
| 9 | Uscg Station Bodega Bay | 108 lbs |
| 10 | Bodean Co Inc | 1 lbs |
| 11 | Syar Industries | 0 lbs |
| 12 | Parker Hannifin Corp Emn Na | 0 lbs |
| 13 | General Hydroponics | 0 lbs |
| 14 | Syar Industries Inc | 0 lbs |
Superfund Sites (2)
| Site Name | Status | HRS Score |
|---|---|---|
| MGM Brakes | Deleted NPL Site | 34.70 |
| Sola Optical USA, Inc. | Deleted NPL Site | 33.39 |
Cities in Sonoma (27)
Frequently Asked Questions
What is the environmental risk level in Sonoma, California? ▼
Are there Superfund sites in Sonoma? ▼
How many toxic release facilities are in Sonoma? ▼
What is the air quality in Sonoma? ▼
Is the drinking water safe in Sonoma? ▼
What environmental agencies cover Sonoma? ▼
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.