Salt Lake City water spans 136 to 571 mg/L hard, Great Salt Lake playa dust drifts in through winter and spring, and inversions hold particulate on glass.
Salt Lake City's water is hard at best and extremely hard from some wells and springs, so the source serving your address matters, and rinse water left to dry will spot. Great Salt Lake playa dust and winter inversions load the glass in the cold months, when working conditions are worst, and June to September is the easiest time to wash. That upside-down season squeezes the working year, and a single-story exterior runs $300 to $550.
The department's 2026 report gives total hardness for every source it uses: Big Cottonwood 136 mg/L, Parleys 175, City Creek 212, city wells and springs 154 to 571, and purchased water from the two valley districts 152 to 184. Hard water, then, and very hard on some wells. What is documented is the source: more than 60% comes from Big and Little Cottonwood Canyons, mountain runoff over mineral-bearing rock, and the balance from other valley supplies, so the mix moves.
Figures by source, as reported.
| Hardness | 136–571 mg/L as CaCO₃ Published per source: 136 at Big Cottonwood, 175 at Parleys and 212 at City Creek, 154 to 571 from city wells and springs, and 152 to 184 in water bought from the valley districts. |
|---|---|
| pH | 7.19–8.24 |
| Alkalinity | 102–254 mg/L as CaCO₃ |
| Iron | 0–0.06 mg/L |
| Manganese | 0–0.0011 mg/L |
| Sodium | 6–63.4 mg/L |
| Chloride | 6.54–216 mg/L |
| Total dissolved solids | 214–796 mg/L |
| Disinfectant | uv + chlorine |
| Source and treatment | Surface water; the department draws more than sixty percent of its supply from Big and Little Cottonwood Canyons and also serves Cottonwood Heights, Millcreek and Holladay · Cascade aeration and permanganate, coagulation, flocculation, rapid mix, sedimentation, rapid sand filtration and sludge treatment, ultraviolet radiation with pre and post chlorination, fluoridation and sequestration · No softening step. |
Not in the report: corrosion index.
SOURCE · Salt Lake City Department of Public Utilities 2026 Water Quality Report, per-source secondary and unregulated tables · How we source these numbers
Great Salt Lake playa dust is the loading that is getting worse rather than staying constant. As the lake bed shrinks, exposed playa drifts across the valley through winter and spring, and it is a fine alkaline mineral dust rather than ordinary grit. Inversion season traps it, along with everything else in the valley air, so the worst glass of the year is in the cold months rather than the warm ones.
UTAH SEASON BY SEASON →Salt Lake City Public Utilities draws more than 60% from Big and Little Cottonwood Canyons and its 2026 report prints total hardness by source: 136 to 212 mg/L at its three canyon plants, 154 to 571 from city wells and springs, and 152 to 184 in water bought from the valley districts — hard to very hard wherever an address sits on the system. The west side of the valley is on a different district entirely and must not inherit this figure. Great Salt Lake playa dust is a worsening alkaline loading, winter inversion puts the dirtiest glass in the cold months, and altitude UV makes failed IGU seals a routine diagnosis.
Salt Lake City Public Utilities draws more than 60% of its supply from Big and Little Cottonwood Canyons, mountain runoff that is clear but mineral-bearing, and also serves Cottonwood Heights, Millcreek and Holladay. Its 2026 report prints total hardness for each source, from 136 mg/L at Big Cottonwood to 212 at City Creek, with wells and springs reaching 571.
The west side of the valley is on a different system entirely. Those cities take Jordan Valley Water Conservancy District supply from Jordanelle and Deer Creek reservoirs plus local wells, so a crew crossing the valley is crossing between two unrelated waters and no figure travels with them.
Figures quoted online for this city tend to run high. If they are directionally right then Salt Lake City is understated rather than overstated, and that is worth testing at the tap rather than assuming either way.
Great Salt Lake playa dust is an increasing rather than stable loading. As the lake bed shrinks, exposed playa drifts across the valley through winter and spring, and it is a fine alkaline mineral dust that works into frame channels rather than sitting on the surface.
Winter inversion traps valley air for days at a time and concentrates everything in it against the glass. It inverts the normal seasonal logic of this trade: the dirtiest glass and the strongest demand arrive in the cold months, when daylight is shortest and conditions are worst.
The Avenues carry pioneer-era residential with leaded, stained and wavy single-pane glass in original sash, much of it predating float manufacturing. At 4,300 feet the UV load also degrades insulated-unit seals faster than at sea level, so failed-IGU diagnosis is a routine conversation here rather than an occasional one.
Winter inversion inverts the normal seasonal logic: the dirtiest glass and the strongest demand arrive in the cold months, when working conditions are worst and daylight is shortest. That compresses the profitable stretch differently from most markets. At 4,300 feet the UV load also degrades IGU seals faster than at sea level, which turns failed-unit diagnosis into a recurring conversation rather than an occasional one.
Two things sit beyond an ordinary domestic method. Playa dust is alkaline and fine enough to work into frame channels, so it needs flooding and a proper clear rather than a wipe. And the Avenues carry pioneer-era residential with leaded, stained and wavy single-pane glass in original sash — that stock predates float manufacturing and a scraper finds the high spots first.
OPEN COST ESTIMATOR →2025 annual mean at the Utah Technical Center monitor, 240 N 1950 W, 1.3 km west of the city (EPA site 49-035-3015).
2025 annual mean at the Rose Park monitor, 1250 North 1400 West, 0.8 km north of the city (EPA site 49-035-3010).
Largest air release: Kennecott Utah Copper Smelter & Refinery, 12000 West 2100 South & 11500 W 2100 S (primary metals), 1 km outside the city limits, 239,747 lb in 2024.
Anyone using water in Salt Lake City, for irrigation or other purposes, must direct the surplus into a proper waterway, and it is unlawful to let it flood streets, sidewalks or private property to their damage, or to run it to unnecessary waste. Long hose runs that sheet water across a sidewalk fall under that ban.
Salt Lake City Code 17.24.130: disposition of waste irrigation water · checked September 2026
Salt Lake City's stormwater program treats any discharge to a storm sewer that isn't entirely stormwater as illicit unless it's on a short allowed list (lawn-watering runoff, individual residential car washing, residual street wash water and the like), and it prohibits improper waste disposal by ordinance. Commercial cleaning rinse is not on that list, so keep it out of gutters and inlets.
Salt Lake City Public Utilities: stormwater quality and permitting (illicit discharge detection and elimination) · checked September 2026
Salt Lake City's preservation handbook for historic residential properties and districts asks that historic windows be repaired rather than replaced wherever possible, that their size, position and arrangement be kept, and that any replacement match the original design. It recommends storm windows to add efficiency on top of, not instead of, the historic sash.
Salt Lake City historic residential design guidelines, Chapter 3: windows · checked September 2026
Composite of mineral salts, fine alkali dust, seasonal organic residue from Great Salt Lake exposed-lakebed margin. Distinct chemistry from standard western dust. Wet-rinse-first protocol; dry-brush-first drives salt fraction deeper into glass-surface micro-texture. Frequency intensified since 2019 as lake levels dropped.
Park City 6,900-8,400 feet elevation, Deer Valley higher. Seal-failure indicators (condensation between panes, edge-seal yellowing) visible at earlier ages than at lower elevations. Document for customers as routine practice. Same pattern documented for Colorado Front Range and Lake Tahoe.
The department's 2026 report gives total hardness for every source it uses: Big Cottonwood 136 mg/L, Parleys 175, City Creek 212, city wells and springs 154 to 571, and purchased water from the two valley districts 152 to 184. Hard water, then, and very hard on some wells.
Residential window cleaning in Salt Lake City typically runs $10–16 per pane or $300–550 for a standard single-story exterior. Winter inversion inverts the normal seasonal logic: the dirtiest glass and the strongest demand arrive in the cold months, when working conditions are worst and daylight is shortest.
Salt Lake City's drier, frost-free months are June to September, by NOAA's 1991–2020 normals for the Salt Lake City International Airport station, where April brings the most rain. The calendar on this page marks June (after the April 25 bloom), August (after smoke season) and September (before frost). Frost nights usually run from October 31 to April 8.
Not as the final rinse: Salt Lake City Department of Public Utilities publishes dissolved solids of 214–796 mg/L, enough to spot as it dries, so finish with pure water. Its sodium, up to 63.4 mg/L, leaves a salt film that pulls moisture back, so rinse it off rather than let it dry. Treatment starts with cascade aeration, permanganate, coagulation and flocculation.
In Salt Lake City the dominant residue patterns include great salt lake playa dust drifting through winter and spring and winter inversion concentrating valley particulate against glass. Great Salt Lake playa dust is the loading that is getting worse rather than staying constant.
Two things sit beyond an ordinary domestic method. Playa dust is alkaline and fine enough to work into frame channels, so it needs flooding and a proper clear rather than a wipe. And the Avenues carry pioneer-era residential with leaded, stained and wavy single-pane glass in original sash — that stock predates float manufacturing and a scraper finds the high spots first.
Pre-1900 historic-residential corridor with substantial leaded, stained, and wavy-glass single-pane. Sugar House and 9th and 9th have their own housing stock and glazing as well.
Just over the Utah line