Stanislaus, 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 Stanislaus in California · Population: 552,250
TRI sites such as Saputo Cheese USA Inc; Blue Diamond Growers; Darling Ingredients Inc; SDWIS systems such as MODESTO, CITY OF; TURLOCK, CITY OF; CERES, CITY OF; NPL sites such as Modesto Ground Water Contamination; Riverbank Army Ammunition Plant; Valley Wood Preserving, Inc. anchor Stanislaus, CA's EPA extract. Derived burden score 69/100 (High 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 Stanislaus include TURLOCK, CITY OF; CERES, CITY OF; RIVERBANK, CITY OF, while Saputo Cheese USA Inc leads reported TRI pounds among local Form R filers. AQS median AQI 53 / peak 150 in 2024.
Burden score 69/100 (High 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 Stanislaus -- 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 Stanislaus, CA: EPA TRI 2023 reporting year
Same facilities, both years
-11.4%
26 facilities that filed in 2022 and 2023
Whole inventory
+4.1%
552.2 thousand lb → 574.7 thousand lb, every facility that filed
These two measures point in opposite directions. Releases from the facilities present in both years fell, while the inventory-wide total rose. The difference is which facilities filed, not a different estimate of the same plants.
Between the two reporting years, 1 facility filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Stanislaus, CA's total reported releases fell from 552.0 thousand lb in 2022 to 488.8 thousand lb in 2023, based on EPA TRI filings.
- Stanislaus, CA's off-site transfers fell from 492.7 thousand lb in 2022 to 430.5 thousand lb in 2023, based on EPA TRI filings.
- Stanislaus, CA's air releases fell from 59.3 thousand lb in 2022 to 58.4 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 | 166 (45%) | 162 | 38 | 150 |
| 2023 | 166 (45%) | 176 | 23 | 150 |
| 2022 | 108 (30%) | 234 | 22 | 166 |
| 2021 | 84 (23%) | 234 | 42 | 172 |
| 2020 | 131 (36%) | 198 | 21 | 195 |
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 (54)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| MODESTO, CITY OF | 218,771 | 0 |
| TURLOCK, CITY OF | 72,682 | 3 |
| CERES, CITY OF | 54,513 | 4 |
| PATTERSON, CITY OF | 24,977 | 0 |
| RIVERBANK, CITY OF | 24,834 | 3 |
| OAKDALE, CITY OF | 23,235 | 1 |
| CITY OF MODESTO - SALIDA | 14,537 | 0 |
| CITY OF NEWMAN-WATER DEPARTMENT | 12,207 | 5 |
| CITY OF WATERFORD | 8,788 | 0 |
| HUGHSON, CITY OF | 7,481 | 76 |
| KEYES COMMUNITY SERVICES DIST. | 5,672 | 110 |
| DENAIR COMMUNITY SERVICES DISTRICT | 5,090 | 0 |
| WESTERN HILLS WATER DISTRICT/DIABLO GRAN | 2,000 | 8 |
| OID-OAKDALE RURAL WATER SYSTEM #1 | 1,570 | 0 |
| CITY OF MODESTO - DEL RIO | 1,327 | 0 |
| CITY OF MODESTO - SOUTH TURLOCK | 1,099 | 0 |
| WATERFORD-RIVER POINTE | 1,079 | 0 |
| CITY OF MODESTO - GRAYSON | 914 | 2 |
| HILLSVIEW HOMES | 887 | 0 |
| RIVERDALE PARK TRACT CSD | 610 | 4 |
| WATERFORD - HICKMAN | 597 | 0 |
| CROWS LANDING COMM SVC DISTRICT | 500 | 1 |
| BUENA VISTA MIGRANT CENTER | 455 | 0 |
| OID #51 - SUNSET OAKS #10 | 287 | 0 |
| FARMINGTON WATER COMPANY | 270 | 0 |
| OID #46 - SUNSET OAKS | 269 | 0 |
| NORTH OAKS MUTUAL WATER CO | 234 | 0 |
| TAHAMA VILLAGE MOBILE HOME PARK | 200 | 0 |
| MONTEREY PARK TRACT CSD | 186 | 53 |
| CITY OF MODESTO - WALNUT MANOR | 175 | 0 |
| CITY OF MODESTO - NORTH TURLOCK | 172 | 0 |
| KNIGHTS FERRY COMM. SVC. DIST. | 168 | 6 |
| COMUNIDAD NUEVO LAGO, INC | 160 | 0 |
| OID #22 - WILLIAMS TRACT | 150 | 0 |
| OID #45 | 144 | 0 |
| COUNTRY SQUIRE MOBILE ESTATES & WATER SY | 131 | 0 |
| CITY OF MODESTO - CENTRAL TURLOCK | 119 | 0 |
| TWIN CYPRESS MOBILE HOME PARK | 112 | 0 |
| WESTLEY CSD | 70 | 1 |
| MORNINGSIDE MOBILEHOME PARK | 67 | 0 |
| 4N MOBILEHOME PARK | 65 | 0 |
| COUNTRY CLUB COUNTY WD | 64 | 1 |
| LONE PINE MHP | 64 | 0 |
| TULLY MOBILE ESTATES | 56 | 0 |
| COUNTRY WESTERN MHRV | 55 | 0 |
| CANTUA CREEK VINEYARDS, IV, LLC. | 52 | 45 |
| CENTURY MOBILE HOME PARK | 50 | 47 |
| COBLES CORNER | 50 | 45 |
| COUNTRY VILLAGE MOBILE HOME PARK | 50 | 2 |
| COUNTRY LEISURE MOBILE ESTATES | 40 | 0 |
| PLEASANT PRAIRIE MHP | 35 | 0 |
| RIVER ROAD MUTUAL WATER COMPANY | 26 | 0 |
| FOSTER FARMS #5 | 26 | 0 |
| STANISLAUS REGIONAL WATER AUTHORITY | 0 | 0 |
TRI Facilities (30)
Superfund Sites (3)
| Site Name | Status | HRS Score |
|---|---|---|
| Modesto Ground Water Contamination | NPL Site | 28.90 |
| Riverbank Army Ammunition Plant | NPL Site | 63.94 |
| Valley Wood Preserving, Inc. | NPL Site | 32.01 |
Cities in Stanislaus (15)
Frequently Asked Questions
What is the environmental risk level in Stanislaus, California? ▼
Are there Superfund sites in Stanislaus? ▼
How many toxic release facilities are in Stanislaus? ▼
What is the air quality in Stanislaus? ▼
Is the drinking water safe in Stanislaus? ▼
What environmental agencies cover Stanislaus? ▼
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.