Great Salt Lake's mining tax now runs on a number the lake hasn't hit since 2012

Utah taxes what companies pull out of Great Salt Lake — magnesium, potash, lithium salts — through a formula written directly around a single gauge reading.▸ The 2024 "Great Salt Lake Revisions" law tripled the base severance tax on lake mineral extraction from 2.6% to 7.8%, then built in an exception: an operator that signs a voluntary water-rights agreement with the state pays a lower rate, or none at all, depending on where the lake's water surface stood on June 15 of the prior year. The trigger is 4,198 feet above sea level. Per USGS gauge 10010000 at Saltair Boat Harbor, the lake has not been at or above that line on June 15 since 2012. As of July 2026 it sits at 4,191.0 feet — seven feet under, and the record low was set less than four years ago, at 4,188.5 feet in November 2022.

The severance tax that applies to a given company depends on two things: did it sign a water-use agreement with the state, and did the lake clear its line.▸ The 2024 law — later amended, but not on this point, by H.B. 247 in 2026 — lays out four scenarios, and they now span the entire space from a tripled top rate to nothing at all.

An operator with no water-rights agreement that uses evaporative concentration — the standard method for pulling minerals out of lake brine — pays 7.8%, triple the 2.6% every other Utah mining operation pays under the general severance tax.▸ An operator that signs a voluntary agreement to give up water gets a break: 2.6% if the lake cleared 4,198 feet the prior June, zero if it didn't. Because the lake hasn't cleared that mark since 2012, the "if it didn't" branch is the only one that has ever applied since the rule took effect — for tax year 2025 and, per the June 2025 reading, for tax year 2026 as well. Compass Minerals, the lake's largest mineral producer, finalized such an agreement with the state in September 2024, permanently committing more than 200,000 acre-feet of water a year back to the lake in exchange for capped withdrawals and, under this formula, a sharply reduced tax bill.

The 4,198-foot trigger isn't arbitrary — it sits inside the range regulators associate with a healthier lake — but the state picked a single date, June 15, to measure it, and that date has landed on the wrong side of the line every year on record since 2012.

The gap has never closed and it isn't shrinking on a straight line — 2022 was the worst June 15 on record short of the actual record low that followed five months later, and 2026's reading (6.4 feet under) is worse than 2025's. Because the statute uses a one-year lag — the reading taken this June sets next year's tax rate — the zero-percent rate for agreement holders is not a temporary condition tied to one bad year.▸ It is, so far, the only rate that has ever actually applied.

Not every industry on the lake gets to wait out a drought.▸ Brine shrimp — harvested as cysts and sold worldwide as aquaculture feed, supplying by some estimates roughly a third of the world's supply — are taxed by the pound, with no elevation exception. Utah Code 59-23-4 sets the royalty at 3.25 cents per pound of unprocessed eggs harvested. Through February 4, 2026 — two days before the season's emergency-extension close — harvesters had reported 40,628,672 pounds to the Division of Wildlife Resources, putting the season's royalty at roughly $1,320,432 (the final total, once the last two harvest days are counted, runs slightly higher). A 2023 count from the industry's own trade group put employment at about 170 people working Utah's harvest each season — the most recent figure available.

H.B. 247, passed in the final days of the 2026 session, redirected the entire royalty into the Sovereign Lands Management Account — previously, part of it went to a broader Species Protection Account not dedicated to the lake.▸ Of the roughly $1.32 million, $125,000 is earmarked by statute for the Great Salt Lake Advisory Council; the remainder must be spent leasing water for the lake or funding brine shrimp habitat projects. It is a small sum next to the state's other 2026 lake spending — $30 million to acquire the bankrupt US Magnesium plant's water rights, and $2.75 million for a new agricultural water-leasing program — but unlike those one-time appropriations, it is money the shrimp fishery pays into the system every single season, rain or drought.

Severance-tax scenarios reflect Utah Code 59-5-202(5)(b) as currently in force; actual dollar amounts collected under each scenario are not public in the sources reviewed for this piece. The brine shrimp royalty figure uses the last cumulative harvest total published before the 2025–26 season's close and will be revised slightly upward once final-season figures post. Employment and world-supply-share figures for the brine shrimp industry are the most recent available (2023) and may have shifted since.