MONSANTO SODA SPRINGS PLANT
Quick Summary
- •Released 6,054,672 lbs of toxic chemicals to the environment in the most recent TRI reporting year.
- •Currently out of compliance in at least one environmental program (CAA, CWA, or RCRA).
- •Assessed $6,300 in total penalties since records began.
- •Reports releases of chemicals classified as known or probable carcinogens.
- Address
-
1853 ID-34
SODA SPRINGS, ID 83276
View on map ↗ - County
- CARIBOU County
- Industry
- Manufacturing
- NAICS (North American Industry Classification)
- 325180
- Inspections
- 4 · last Oct 30, 2025
- Total Penalties
- $6,300 · last Jan 4, 2024
- Registry ID
- 110000743982
How This Compares
Ranked by most recent year's total TRI releases.
Compliance Status (Last 12 Quarters)
Number of calendar quarters, out of the last 12, in which this facility was in violation of its permit. Zero means no recorded violations in that program over the past three years.
Qtrs Non-Compliant
Qtrs Non-Compliant
Qtrs Non-Compliant
TRI Toxic Chemical Releases
Annual pounds of each toxic chemical released to air, water, and land, as reported to the EPA Toxic Release Inventory. Carcinogen (♦) and PFAS designations are per EPA and IARC classifications.
| Year | Total Releases (lbs) | vs Prior Year |
|---|---|---|
| 2015 | 5,975,646 | — |
| 2016 | 4,716,882 | -21% |
| 2017 | 6,054,672 | +28% |
| 2018 | 5,953,208 | -2% |
| 2019 | 4,610,965 | -23% |
| 2020 | 5,721,460 | +24% |
| 2021 | 4,398,912 | -23% |
| 2022 | 4,459,431 | +1% |
| 2023 | 4,002,052 | -10% |
| 2024 | 4,432,339 | +11% |
2024
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Zinc compounds | 2,488,948 | 49,022 | — | 2,439,926 | 9 | |
| Vanadium compounds | 741,724 | 683 | — | 741,041 | 9 | |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 469,052 | 3,958 | — | 465,094 | 4 | |
| Cadmium compounds | 246,161 | 3,887 | — | 242,274 | 0 | ♦ Carcinogen |
| Manganese compounds | 105,554 | 157 | — | 105,397 | — | |
| Copper compounds | 65,849 | 239 | — | 65,610 | 5 | |
| Selenium compounds | 61,790 | 3,410 | — | 58,380 | 0 | |
| Nickel compounds | 54,749 | 436 | — | 54,313 | 1 | ♦ Carcinogen |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 52,090 | 52,090 | — | — | — | |
| Arsenic compounds | 45,277 | 327 | — | 44,950 | 0 | ♦ Carcinogen |
| Lead compounds | 40,567 | 361 | — | 40,206 | 0 | |
| Antimony compounds | 16,067 | 684 | — | 15,383 | 5 | |
| Hydrogen cyanide | 15,189 | 15,189 | — | — | — | |
| Hydrogen sulfide | 9,915 | 9,915 | — | — | — | |
| Carbonyl sulfide | 4,820 | 4,820 | — | — | — | |
| Phosphorus (yellow or white) | 4,693 | 507 | — | 4,186 | 1,555 | |
| Hydrogen fluoride | 4,568 | 4,568 | — | — | — | |
| Phosphine | 4,491 | 4,491 | — | — | — | |
| Mercury compounds | 835 | 594 | — | 241 | 0 |
2023
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Zinc compounds | 2,223,526 | 46,174 | 304 | 2,177,048 | 6 | |
| Vanadium compounds | 679,962 | 623 | 81 | 679,258 | 8 | |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 434,402 | 3,913 | 26 | 430,463 | 4 | |
| Cadmium compounds | 218,648 | 3,880 | — | 214,768 | 0 | ♦ Carcinogen |
| Manganese compounds | 98,629 | 153 | — | 98,476 | — | |
| Copper compounds | 59,945 | 226 | 24 | 59,694 | 4 | |
| Selenium compounds | 56,167 | 3,395 | 38 | 52,734 | 0 | |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 52,237 | 52,237 | — | — | — | |
| Nickel compounds | 49,312 | 424 | 32 | 48,856 | 1 | ♦ Carcinogen |
| Arsenic compounds | 40,659 | 325 | 2 | 40,332 | 0 | ♦ Carcinogen |
| Lead compounds | 36,483 | 349 | — | 36,134 | 0 | |
| Antimony compounds | 14,560 | 649 | — | 13,911 | 8 | |
| Hydrogen cyanide | 13,963 | 13,963 | — | — | — | |
| Hydrogen sulfide | 9,074 | 9,074 | — | — | — | |
| Carbonyl sulfide | 4,421 | 4,421 | — | — | — | |
| Phosphine | 4,291 | 4,291 | — | — | — | |
| Hydrogen fluoride | 4,239 | 4,239 | — | — | — | |
| Mercury compounds | 901 | 682 | — | 219 | 0 | |
| Phosphorus (yellow or white) | 631 | 631 | — | — | 1,466 |
2022
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Zinc compounds | 2,353,121 | 52,916 | 17 | 2,300,188 | 5 | |
| Vanadium compounds | 833,320 | 592 | 7 | 832,721 | 7 | |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 546,613 | 5,353 | — | 541,260 | 3 | |
| Cadmium compounds | 225,919 | 4,164 | — | 221,755 | 0 | ♦ Carcinogen |
| Manganese compounds | 126,926 | 159 | — | 126,767 | — | |
| Copper compounds | 71,948 | 273 | — | 71,675 | 3 | |
| Selenium compounds | 60,833 | 4,362 | — | 56,471 | 0 | |
| Nickel compounds | 57,329 | 445 | — | 56,884 | 1 | ♦ Carcinogen |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 46,626 | 46,626 | — | — | — | |
| Arsenic compounds | 45,083 | 366 | 2 | 44,715 | 0 | ♦ Carcinogen |
| Lead compounds | 41,174 | 380 | — | 40,794 | 0 | |
| Antimony compounds | 16,619 | 736 | — | 15,883 | 7 | |
| Hydrogen cyanide | 13,885 | 13,885 | — | — | — | |
| Hydrogen sulfide | 8,714 | 8,714 | — | — | — | |
| Hydrogen fluoride | 4,931 | 4,931 | — | — | — | |
| Phosphine | 4,478 | 4,478 | — | — | — | |
| Mercury compounds | 986 | 730 | — | 256 | 0 | |
| Carbonyl sulfide | 529 | 529 | — | — | — | |
| Phosphorus (yellow or white) | 399 | 399 | — | — | 1,065 |
2021
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Zinc compounds | 2,516,648 | 51,096 | 200 | 2,465,353 | 5 | |
| Vanadium compounds | 712,652 | 555 | 43 | 712,054 | 6 | |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 448,956 | 5,366 | — | 443,590 | 3 | |
| Cadmium compounds | 248,679 | 4,193 | — | 244,486 | 0 | ♦ Carcinogen |
| Manganese compounds | 99,927 | 153 | 0 | 99,773 | — | |
| Copper compounds | 63,720 | 267 | — | 63,453 | 3 | |
| Selenium compounds | 62,865 | 4,384 | — | 58,481 | 0 | |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 54,423 | 54,423 | — | — | — | |
| Nickel compounds | 53,389 | 443 | 2 | 52,943 | 1 | ♦ Carcinogen |
| Arsenic compounds | 44,883 | 367 | 3 | 44,513 | 0 | ♦ Carcinogen |
| Lead compounds | 40,013 | 372 | — | 39,641 | 0 | |
| Antimony compounds | 15,834 | 715 | 5 | 15,114 | 5 | |
| Hydrogen cyanide | 13,934 | 13,934 | — | — | — | |
| Hydrogen sulfide | 9,080 | 9,080 | — | — | — | |
| Phosphine | 4,320 | 4,320 | — | — | — | |
| Hydrogen fluoride | 4,268 | 4,268 | — | — | — | |
| Carbonyl sulfide | 3,230 | 3,230 | — | — | — | |
| Mercury compounds | 1,213 | 977 | 1 | 235 | 0 | |
| Phosphorus (yellow or white) | 878 | 615 | — | 263 | 987 |
2020
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Zinc compounds | 3,419,224 | 50,724 | 129 | 3,368,372 | 4 | |
| Vanadium compounds | 868,757 | 717 | 58 | 867,982 | 5 | |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 525,707 | 5,039 | 7 | 520,662 | 4 | |
| Cadmium compounds | 340,949 | 3,844 | — | 337,105 | 0 | ♦ Carcinogen |
| Manganese compounds | 112,615 | 159 | — | 112,456 | — | |
| Selenium compounds | 79,876 | 4,035 | 12 | 75,829 | 0 | |
| Copper compounds | 79,865 | 258 | 1 | 79,606 | 2 | |
| Nickel compounds | 69,567 | 425 | — | 69,142 | 1 | ♦ Carcinogen |
| Arsenic compounds | 59,230 | 341 | 3 | 58,886 | 0 | ♦ Carcinogen |
| Lead compounds | 52,598 | 361 | — | 52,237 | 2 | |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 52,419 | 52,419 | — | — | — | |
| Antimony compounds | 20,108 | 703 | — | 19,405 | 6 | |
| Hydrogen cyanide | 15,149 | 15,149 | — | — | — | |
| Hydrogen sulfide | 9,870 | 9,870 | — | — | — | |
| Carbonyl sulfide | 4,689 | 4,689 | — | — | — | |
| Phosphine | 4,559 | 4,559 | — | — | — | |
| Hydrogen fluoride | 4,398 | 4,398 | — | — | — | |
| Mercury compounds | 1,193 | 895 | 1 | 297 | 0 | |
| Phosphorus (yellow or white) | 687 | 609 | — | 78 | 1,142 |
2019
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Zinc compounds | 3,582,283 | 46,678 | 483 | 3,535,122 | 4 | |
| Vanadium compounds | 894,449 | 693 | 87 | 893,669 | 5 | |
| Manganese compounds | 113,903 | 149 | 50 | 113,704 | — | |
| Hydrogen cyanide | 14,494 | 14,494 | — | — | — | |
| Phosphine | 4,505 | 4,505 | — | — | — | |
| Mercury compounds | 1,332 | 1,010 | 1 | 321 | 0 |
2018
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Zinc compounds | 3,510,107 | 49,497 | 52 | 3,460,558 | 7 | |
| Vanadium compounds | 950,733 | 798 | 29 | 949,906 | 8 | |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 581,152 | 4,200 | 29 | 576,922 | 4 | |
| Cadmium compounds | 344,521 | 4,601 | — | 339,920 | 0 | ♦ Carcinogen |
| Manganese compounds | 126,418 | 191 | 14 | 126,214 | — | |
| Selenium compounds | 80,260 | 3,684 | — | 76,576 | 0 | |
| Nickel compounds | 74,594 | 512 | — | 74,082 | 1 | ♦ Carcinogen |
| Arsenic compounds | 61,545 | 384 | 3 | 61,158 | 0 | ♦ Carcinogen |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 60,742 | 60,742 | — | — | — | |
| Lead compounds | 55,804 | 392 | — | 55,412 | 0 | |
| Copper compounds | 36,389 | 315 | 0 | 36,074 | 4 | |
| Antimony compounds | 21,072 | 676 | — | 20,396 | 6 | |
| Hydrogen cyanide | 15,872 | 15,872 | — | — | — | |
| Hydrogen sulfide | 10,474 | 10,474 | — | — | — | |
| Hydrogen fluoride | 9,357 | 9,357 | — | — | — | |
| Carbonyl sulfide | 4,885 | 4,885 | — | — | — | |
| Phosphine | 4,763 | 4,763 | — | — | — | |
| Phosphorus (yellow or white) | 3,086 | 1,231 | — | 1,855 | 1,522 | |
| Mercury compounds | 1,434 | 1,101 | 1 | 332 | 0 |
2017
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Zinc compounds | 3,535,205 | 42,142 | 100 | 3,492,963 | 4 | |
| Vanadium compounds | 984,127 | 2,487 | — | 981,640 | 5 | |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 603,954 | 3,434 | 7 | 600,513 | 3 | |
| Cadmium compounds | 354,042 | 5,926 | 17 | 348,099 | 0 | ♦ Carcinogen |
| Manganese compounds | 132,686 | 257 | — | 132,429 | — | |
| Selenium compounds | 82,628 | 2,955 | 75 | 79,598 | 0 | |
| Nickel compounds | 76,379 | 775 | — | 75,604 | 1 | ♦ Carcinogen |
| Arsenic compounds | 63,298 | 481 | 3 | 62,814 | 0 | ♦ Carcinogen |
| Lead compounds | 57,437 | 454 | — | 56,983 | 0 | |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 56,643 | 56,643 | — | — | — | |
| Copper compounds | 38,585 | 438 | — | 38,147 | 2 | |
| Antimony compounds | 21,616 | 610 | — | 21,006 | 5 | |
| Hydrogen cyanide | 15,392 | 15,392 | — | — | — | |
| Hydrogen sulfide | 10,254 | 10,254 | — | — | — | |
| Hydrogen fluoride | 7,427 | 7,427 | — | — | — | |
| Carbonyl sulfide | 4,914 | 4,914 | — | — | — | |
| Phosphine | 4,502 | 4,502 | — | — | — | |
| Phosphorus (yellow or white) | 3,969 | 1,179 | — | 2,790 | 1,855 | |
| Mercury compounds | 1,615 | 1,278 | 1 | 337 | 0 |
2016
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Zinc compounds | 2,550,499 | 39,917 | 531 | 2,510,051 | 5 | |
| Vanadium compounds | 861,419 | 2,541 | 151 | 858,727 | 5 | |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 550,479 | 3,454 | 125 | 546,900 | 2 | |
| Cadmium compounds | 254,741 | 5,972 | 38 | 248,731 | 0 | ♦ Carcinogen |
| Manganese compounds | 125,911 | 255 | 56 | 125,600 | — | |
| Selenium compounds | 63,206 | 2,951 | 58 | 60,197 | 0 | |
| Nickel compounds | 62,080 | 755 | 55 | 61,270 | 1 | ♦ Carcinogen |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 57,501 | 57,501 | — | — | — | |
| Arsenic compounds | 49,022 | 484 | 8 | 48,530 | 0 | ♦ Carcinogen |
| Lead compounds | 45,044 | 449 | 0 | 44,595 | 0 | |
| Copper compounds | 39,314 | 422 | 50 | 38,842 | 3 | |
| Antimony compounds | 17,420 | 579 | 4 | 16,837 | 3 | |
| Hydrogen cyanide | 14,275 | 14,275 | — | — | — | |
| Hydrogen sulfide | 9,494 | 9,494 | — | — | — | |
| Hydrogen fluoride | 7,302 | 7,302 | — | — | — | |
| Phosphine | 4,343 | 4,343 | — | — | — | |
| Carbonyl sulfide | 2,552 | 2,552 | — | — | — | |
| Mercury compounds | 1,149 | 868 | — | 281 | 0 | |
| Phosphorus (yellow or white) | 1,133 | 1,133 | — | — | 1,559 |
2015
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Zinc compounds | 3,429,770 | 41,492 | 305 | 3,387,973 | 6 | |
| Vanadium compounds | 1,006,602 | 2,511 | — | 1,004,091 | 7 | |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 620,470 | 3,450 | 73 | 616,947 | 3 | |
| Cadmium compounds | 343,095 | 6,024 | 94 | 336,977 | 0 | ♦ Carcinogen |
| Manganese compounds | 136,848 | 260 | — | 136,588 | — | |
| Selenium compounds | 79,329 | 2,977 | 43 | 76,309 | 0 | |
| Nickel compounds | 77,577 | 766 | 26 | 76,785 | 1 | ♦ Carcinogen |
| Arsenic compounds | 62,654 | 489 | 6 | 62,159 | 0 | ♦ Carcinogen |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 58,803 | 58,803 | — | — | — | |
| Lead compounds | 57,020 | 458 | — | 56,562 | 0 | |
| Copper compounds | 39,774 | 434 | 26 | 39,314 | 4 | |
| Antimony compounds | 21,479 | 600 | 2 | 20,877 | 4 | |
| Hydrogen cyanide | 14,959 | 14,959 | — | — | — | |
| Hydrogen sulfide | 9,744 | 9,744 | — | — | — | |
| Hydrogen fluoride | 7,671 | 7,671 | — | — | — | |
| Phosphine | 4,715 | 4,715 | — | — | — | |
| Carbonyl sulfide | 2,761 | 2,761 | — | — | — | |
| Mercury compounds | 1,216 | 877 | 0 | 339 | 0 | |
| Phosphorus (yellow or white) | 1,159 | 1,159 | — | — | 2,738 |
Waste Management & Recycling
How this facility manages toxic chemicals beyond direct releases — through recycling, energy recovery, and on-site or off-site treatment. Data from the most recent TRI reporting year. Quantities in pounds.
| Chemical | Released | Recycled | Energy Recovery | Treated |
|---|---|---|---|---|
| Hydrogen fluoride | — | — | — | 133,501 |
| Hydrogen sulfide | — | — | — | 106,738 |
| Carbonyl sulfide | — | — | — | 229,364 |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | — | — | — | 56,715 |
| Phosphorus (yellow or white) | — | 21,754 | — | 167,909 |
| Phosphine | — | — | — | 40,935 |
| Hydrogen cyanide | — | — | — | 132,345 |
Off-Site Transfer Destinations
Facilities to which toxic chemicals were transferred for disposal, recycling, energy recovery, or treatment during the most recent TRI reporting year. Quantities in pounds.
| Destination | Chemical | Disposal | Recycling | Energy Rec. | Treatment |
|---|---|---|---|---|---|
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Arsenic compounds | 0 | — | — | — |
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Zinc compounds | 9 | — | — | — |
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Selenium compounds | 0 | — | — | — |
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Vanadium compounds | 9 | — | — | — |
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Antimony compounds | 5 | — | — | — |
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Cadmium compounds | 0 | — | — | — |
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Copper compounds | 5 | — | — | — |
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Lead compounds | 0 | — | — | — |
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Nickel compounds | 1 | — | — | — |
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Mercury compounds | 0 | — | — | — |
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Chromium compounds (except for chromite ore mined in the Transvaal Region) | 4 | — | — | — |
|
CLEAN HARBORS GRASSY MOUNTAIN
KNOLLS, UT
|
Phosphorus (yellow or white) | 1,555 | — | — | — |
Compliance Violations
Individual permit violations recorded by the EPA across air, water, and hazardous waste programs. Open violations are unresolved as of the most recent ECHO data update.
| Program | Type | Violation Date | Return to Compliance | Status |
|---|---|---|---|---|
| rcra | Standards Applicable to Generators of HW: General | Oct 30, 2025 | Oct 30, 2025 | Resolved |
| caa | FRV | Sep 13, 2023 | — | Open |
| caa | FRV | Nov 15, 2022 | — | Open |
| caa | FRV | Dec 30, 2019 | — | Open |
| caa | FRV | Oct 26, 2016 | — | Open |
| rcra | Standards Applicable to Generators of HW: General | Dec 3, 2001 | Jan 5, 2009 | Resolved |
| rcra | Land Disposal Restrictions: General | Dec 3, 2001 | Jan 5, 2009 | Resolved |
| rcra | Standards Applicable to Recordkeeping and Reporting Applicable to Small and Large Quantity Generators | Jul 14, 1994 | Aug 15, 1994 | Resolved |
Enforcement Actions
Formal enforcement cases brought by the EPA or state agencies, including administrative orders and civil penalties assessed. Penalty amounts reflect what was formally assessed, not necessarily what was collected.