Burlington water is 64 mg/L hard, road-salt chloride builds on lower panes by the operator's own account, and lake humidity keeps dry-down slow.
Burlington treats its own Lake Champlain water at a waterfront plant running since 1908, and at 64 mg/L it is only moderately hard, so the rinse is rarely the problem. Road salt, which the utility names as a chloride source, builds on the lower panes, lake humidity slows drying, and freeze-thaw works at sills and old putty over the winter. With a five-month working year, June, August and September carry the demand, and a single-story exterior runs $260 to $430.
At 64 ppm with a negative saturation index, Burlington's water is at the top of the soft band and chemically inclined to dissolve rather than deposit. Spotting that does appear is thin and lifts easily, and the residue that actually causes complaints is the road-salt chloride fraction, which behaves nothing like lime scale — it goes tacky in damp air instead of hardening.
| Hardness | 64 mg/L as CaCO₃ 3.7 grains per gallon; earlier editions describe the supply as slightly to moderately hard at 3 to 5 grains, 51 to 86 ppm, as published by Burlington Department of Public Works, Water Division. |
|---|---|
| Alkalinity | 56 mg/L as CaCO₃ |
| Iron | < 0.02 mg/L |
| Manganese | < 0.01 mg/L |
| Sodium | 13 mg/L |
| Chloride | 16 mg/L |
| Total dissolved solids | 81 mg/L |
| Disinfectant | free chlorine |
| Source and treatment | Lake Champlain, drawn through an intake pipe 4,200 feet offshore and 45 feet below the surface, at the waterfront plant which has operated since 1908 · Filtered twice. Filter aids are added to enhance removal of dissolved and particulate matter, large particles settle out by gravity in clarifiers, then the water is filtered once through anthracite coal and again through sand. Chlorine is added for disinfection and to hold a residual through distribution, fluoride is added, and a corrosion inhibitor keeps lead and copper from leaching. · No softening step. |
Not in the report: pH and corrosion index.
SOURCE · Burlington Department of Public Works, Water Division, 2025 Consumer Confidence Report, WSID VT0005053, secondary-contaminants table sampled 28 May 2025, with the 'How is Your Water Processed?' section (burlingtonvt.gov) · How we source these numbers
Winter sets the cycle in Burlington, not minerals. Salt spray, wood-heat film and ice damming build through a long closed season, so the spring reset is the heavy job and summer maintenance is light. Waterfront and street-facing elevations run on a shorter interval than sheltered ones on the same block, and the whole calendar compresses into roughly May to October.
VERMONT SEASON BY SEASON →Burlington treats its own Lake Champlain water at a waterfront plant running since 1908, and publishes hardness at 64 ppm — 3.7 grains per gallon, the top of the soft band. It does not buy from Champlain Water District despite sitting inside that district's map, and the same report gives a Langelier index of minus 1.82, meaning the supply dissolves rather than deposits. The mineral job here is small. The real one is the pre-1900 stock: Burlington has one of the oldest housing inventories of any small city in the country, and the spring first-clean on Hill Section and Old North End sash is an inspection as much as a wash.
Burlington runs its own water system and is itself a wholesaler, not a Champlain Water District customer. The distinction matters because CWD serves South Burlington, Colchester, Essex and Winooski all around it, and a crew that assumes one regional supply is quoting the wrong document. Both draw Lake Champlain and both land near 60, so the numbers happen to agree — but they agree because the lake is shared, not because the systems are.
The published figure is 64 ppm, or 3.7 grains per gallon, with alkalinity at 56 and calcium at 18. Earlier editions of the same report describe the supply as ranging from three to five grains, 51 to 86 ppm. That puts Burlington at the top of the soft band and just under the moderate one — enough mineral to see on dark glass in a dry week, not enough to justify a permanent deionisation policy on residential work.
The same report publishes a Langelier saturation index of minus 1.82. A negative index means water that has capacity to dissolve calcium carbonate rather than lay it down, which is why the plant doses an orthophosphate corrosion inhibitor. For glass it means deposits are not the failure mode here; the supply is working in the opposite direction.
Chloride runs 16 ppm and the utility names the cause itself: road salt used on Vermont roads and sidewalks in winter, reaching the lake and coming back through the intake. That fraction of the dissolved load behaves hygroscopically rather than as scale — it pulls moisture back out of the air on a damp morning instead of drying to a hard film, and it concentrates on the lower panes nearest the street.
Burlington's housing stock is genuinely old for its size. The Hill Section and the Old North End are dominated by pre-1900 and pre-1920 construction carrying original sash, and Church Street's commercial frontage is nineteenth-century above the shopfronts. Heritage handling is the default residential method here rather than a specialism reserved for a few addresses.
The exterior season is short and the lake governs its edges. Champlain holds cold well into spring and ice break-up can push waterfront commercial scheduling into late April; the autumn close comes early. The practical year is roughly May to October, and the June-to-August window carries most of the capacity pressure.
The University of Vermont and its medical centre together anchor an institutional book far larger than a city of forty-odd thousand would otherwise support. That work procures formally and recurs on contract, which makes it the stabilising half of a business whose retail half is seasonal.
Season length is the first driver — a five-month working year concentrates demand and prices the midsummer peak. Heritage handling is the second, and it is specific to Burlington rather than regional: a Hill Section house takes materially longer per pane than an identically sized New North End house, and pricing them off the same rate card loses money on the older one. The UVM and hospital book sits outside both, procured formally on contract and priced at bid rather than at the door.
Soft water and a forgiving supply make a good homeowner result realistic on the New North End's mid-century glazing. The Hill Section and Old North End are a different proposition: pre-1900 sash with soft putty and original wavy glass does not survive a scraper or a strong alkaline cleaner, and the loss is permanent. The other thing that does not transfer is the salt film, which needs a surfactant and a rinse rather than pressure, and which people reliably attack with more force instead.
OPEN COST ESTIMATOR →Nearest EPA particle monitor: 30 km
Burlington's water chapter reserves fire hydrants and their pipes for fire purposes only and forbids anyone to meddle with hydrants or valves; nobody may draw or use water from the city works unless the public works department turned it on, so a wash crew has to arrange its supply with the department instead of opening a hydrant.
Burlington Code of Ordinances Ch. 31 §§31-5, 31-6 and 31-11: fire hydrants; interference; turning water on · checked September 2026
Burlington bars anyone from leaving water or other material on a street, sidewalk, parking area or storm system component where it may pollute or clog the storm sewer, combined sewer or lake, and illegal discharges are banned outright; only noncommercial vehicle washing and water free of pollutants make the exempt list, so commercial rinse water must be contained.
Burlington Code of Ordinances Ch. 26 §§26-112 and 26-113: prohibitions and exemptions · checked September 2026
Burlington applies its historic building rules to any structure listed on, or eligible for, the state or national register, generally anything 50 years or older with historic significance and integrity; applications involving those buildings go through design review under the Secretary of the Interior's standards, which favor repairing distinctive features and matching any replacement.
Burlington Comprehensive Development Ordinance Art. 5 Sec. 5.4.8: historic buildings and sites · checked September 2026
Late-winter and early-spring ice-melt residue carries chloride-residue, mineral residue, and organic residue composite. Ice-dam meltwater residue from roof-edge ice damming produces a distinctive composite residue on upper-pane and sash-perimeter glass. Percarbonate-citric ladder protocol required on the worst-affected stock. Same handling pattern Linnea Jorgensen documents for Minnesota.
Deciduous tree-pollen wave dominant statewide. Lower density than Southern pine-pollen wave. Wet-rinse handling. No scraping, no dry-brushing.
Sugar-house steam emissions during the boiling season produce a distinctive sticky organic residue on glass — sugar-and-mineral composite. Heavier on sugar-house-adjacent residential and commercial. Operationally distinctive Vermont contaminant. Extended alkaline-soap dwell plus light citric finish. Operator local-knowledge handling required.
At 64 ppm with a negative saturation index, Burlington's water is at the top of the soft band and chemically inclined to dissolve rather than deposit. Spotting that does appear is thin and lifts easily, and the residue that actually causes complaints is the road-salt chloride fraction, which behaves nothing like lime scale — it goes tacky in damp air instead of hardening.
Residential window cleaning in Burlington typically runs $9–14 per pane or $260–430 for a standard single-story exterior. Season length is the first driver — a five-month working year concentrates demand and prices the midsummer peak.
Burlington's drier, frost-free months are June and August and September, by NOAA's 1991–2020 normals for the Burlington International Airport station, where July brings the most rain. The calendar on this page marks June (after the May 15 bloom and after smoke season). Frost nights usually run from October 15 to April 29.
Usually yes: Burlington Department of Public Works, Water Division publishes dissolved solids of 81 mg/L, low enough that tap-rinsed glass tends to dry clean. Treatment starts with filtered twice.
In Burlington the dominant residue patterns include road-salt chloride on lower panes (operator-attributed) and lake-effect humidity and slow dry-down. Winter sets the cycle in Burlington, not minerals. Salt spray, wood-heat film and ice damming build through a long closed season, so the spring reset is the heavy job and summer maintenance is light.
Soft water and a forgiving supply make a good homeowner result realistic on the New North End's mid-century glazing. The Hill Section and Old North End are a different proposition: pre-1900 sash with soft putty and original wavy glass does not survive a scraper or a strong alkaline cleaner, and the loss is permanent.
Pre-1900 affluent residential on the slope above downtown, with substantial original-glazing retention. Wavy glass, soft putty and tall sash — the slowest and most careful residential work in the city, and the highest per-job values. Old North End and South End have their own housing stock and glazing as well.
Just over the Vermont line