A $100 Million Lithium Project, a 20-Year Discharge and One Week Left to Comment

Project Scope and Timeline

• Location: DOE describes the site as being on the Great Salt Lake's "northeastern shore." Utah's own permitting record locates it more precisely: on the western slope of the Promontory Mountains, on the eastern edge of Gunnison Bay (the lake's North Arm) in unincorporated Box Elder County — the eastern edge of the lake's northern arm, which is the same location DOE's shorthand refers to.
• Production Targets: Designed for a 20-year lifespan, the Phase 1 facility aims to produce approximately 5,000 metric tons of battery-grade lithium carbonate annually. DOE's own project description says the facility "aims to double current U.S. lithium production and lay the groundwork for future expansion."
• Operational Schedule: The commercial plant follows a 28-week demonstration plant that operated from February through August 2025 — described elsewhere in Waterleaf's own permit filings as a seven-month pilot. DOE credits that demonstration, calling the award "supported by successful pilot testing and completed front-end engineering." Commercial production is targeted to begin around 2028.

Direct Lithium Extraction and the "No Net Water Loss" Claim

Unlike traditional evaporation-pond mining, Waterleaf uses a proprietary ion-exchange (IX) direct lithium extraction (DLE) process.

• The Process: Raw brine is pumped from the North Arm, filtered, and run through IX DLE equipment that selectively pulls lithium out. The lithium-depleted brine is treated and discharged back into Gunnison Bay.
• Water Balance: Externally sourced groundwater, treated by reverse osmosis, is added to the process as a washing agent for the ion-exchange media. The company's permit application projects an annual intake of about 18,156 acre-feet of lake brine and a discharge of 18,356 acre-feet — a difference of 200 acre-feet supplied by that imported groundwater. That is not necessarily a net gain for the lake: the demonstration plant's own water balance showed roughly 4 percent of its combined brine-and-groundwater input never reached the discharge pipe at all, retained instead in the liquid lithium sulfate product shipped off-site for further processing.
• The Claim: DOE's own project description states the facility will return "processed brine back to the lake with no net water loss." The company's mass-balance projections show that while several dissolved salts (sodium, sulfate, total dissolved solids) would leave the plant at slightly lower concentrations than they entered, the higher discharge volume means the total mass of those salts returned to the lake would still be somewhat higher year over year — a distinction that doesn't appear in either the company's or DOE's framing but shows up in Waterleaf's own permit filing.

The Ticking Clock: Active State Permitting

While federal funding moves forward, the plant's Utah operating entity — Waterleaf Phase 1, LLC — is separately working through a staged sequence of state environmental reviews this summer:

• An Operator Certification Decision (comments closed July 17)
• The base UPDES discharge permit itself (comments closed July 30)
• A Level II Antidegradation Review tied to that same permit — the one still open

That review, UPDES Permit No. UT0026352, is what's live right now. The public comment window closes at close of business August 27, 2026. Written comments and requests for a public hearing go to James Harris at the Utah Division of Water Quality (jamesharris@utah.gov).

The Manganese Record

The antidegradation review under public comment was specifically revised to add "clarification on the manganese treatment process testing," according to the state's public notice. That language points to a real, measured problem from the demonstration plant — not a hypothetical one.

The commercial plant's permit application proposes a new manganese-treatment step — absent from the demonstration plant — designed to bring discharge concentrations back down to roughly influent levels before the water reaches the lake. That target is a projection based on engineering analysis, not a result the company has yet demonstrated at any scale. For context on scale alone: the commercial plant's projected annual discharge volume is roughly 5,280 times the demonstration plant's total discharge over its entire seven-month run — a volume comparison, not a manganese-load comparison, since the commercial design includes that proposed treatment system the demonstration plant did not have.

DOE's own project description calls the demonstration "successful pilot testing." The manganese finding above came directly out of that same pilot — and it's the specific reason the state's antidegradation review was revised this summer to add treatment-testing language in the first place.

Waterleaf argues the increase isn't significant, for three reasons: no numeric water quality standard exists for the North Arm, which is a narrative-standards-only water body; the total added mass during the demonstration run — 1.88 pounds against a North Arm manganese baseline the company estimated at 362,100 pounds — is vanishingly small; and it points to federal guidance on dermal exposure to manganese while showering in drinking water as a reference point for safety.

That comparison, though, was measured against the demonstration plant's total discharge of about 3.5 acre-feet over its entire run. The commercial plant is designed to discharge roughly 18,356 acre-feet every year for two decades.

HDR, the same engineering firm that both ran the demonstration plant's compliance monitoring and prepared major portions of the commercial plant's permit application, is the source of these figures. Waterleaf separately contracted with Westminster University scientist Bonnie Baxter for the companion biota study, which concluded the plant's discharge did not harm the lake's microbial communities. Both studies were commissioned by the applicant; the public record reviewed here does not include a separate, state-commissioned replication of either set of findings.

The biota study's own conclusions are also narrower than a simple "no harm" summary suggests. Waterleaf's report acknowledges that filtration reduced the number of algae species detected in the discharge compared to the intake, and that its DNA-based abundance results could not validly be compared between influent and discharge samples — only within each sample individually. Only three monitoring events were conducted over the plant's run, and the growth-rate experiment inoculated one milliliter of sample into nine milliliters of prepared hypersaline growth medium, rather than testing organisms in undiluted discharge. The state's UPDES permit did not require a biota assessment at all — this data exists because Waterleaf chose to collect it.

Other Findings From the Demonstration Run

Several other metals showed measurable shifts during the 2025 pilot. Copper, iron, mercury, and nickel all came out of the plant at higher concentrations than they went in — iron rose the most, up 272 percent — but the company attributes those increases to corrosion in carbon-steel holding tanks during the plant's first five weeks of startup, not to the lithium-extraction process itself. Rust flakes were visibly present in early discharge samples. Waterleaf changed operating practices after observing the corrosion, reducing fluctuations in tank water levels to limit exposure of the steel interiors, and rust flakes were not reported after week five; the commercial plant's design calls for replacing those carbon-steel tanks entirely. All six salt constituents the company tracked — calcium, chloride, magnesium, potassium, sodium, and sulfate — came out at lower concentrations than they went in.

Questions Worth Asking

For readers who want to press further:

1. Has the proposed manganese-treatment system been tested at any scale before the state approves a full 20-year discharge permit built on the assumption it will work?
2. Where would the roughly 200 acre-feet of groundwater a year the commercial plant needs actually come from, given the pending Mango-Spiral Jetty litigation over the same water?
3. Was the biota study required by the state, or offered voluntarily by the company — and would an independent, state-commissioned study reach the same conclusions?
4. Who is checking DOE's "no net water loss" claim against the company's own permit filing, which shows a slightly higher total mass of salts returned to the lake?

Graded by the Rubric

Every case in this docket is graded against The Weber County Hive's standing five-part rubric — Power, Transparency, Financial Accountability, Environmental Impact, and Community Impact — not this reporter's opinion. The rubric asks the same five questions of every piece regardless of subject.