Shreveport water is soft at 23.5 mg/L, so the work is honeydew and tannin under mature canopy, and diesel film along the rail and freight corridors.
Shreveport's reservoir water is soft, so the tap leaves little behind; honeydew and tannin under mature canopy and diesel film along the rail and freight corridors are the real work. In Shreveport, April and July to October are the months to wash. Canopy and pane count push the historic districts above their glass area, and a single-story exterior runs $240 to $430.
The state's 2025 treated-water sample reads 23.5 mg/L: soft water, as a surface reservoir supply would suggest. What matters more is the category difference: this is the only large Louisiana city in this batch on surface water, and the groundwater cities to the south sit on aquifers with quite different mineral, iron and chloride characteristics. Nothing learned about them transfers here, and mineral spotting is unlikely to be the governing problem.
| Hardness | 23.5 mg/L as CaCO₃ Single treated-water sample of 23.5 mg/L (February 2025) in the state-prepared report; soft on the USGS ladder, as published by City of Shreveport Department of Water and Sewerage. |
|---|---|
| pH | 6.29 |
| Sodium | 32.4 mg/L |
| Chloride | 25 mg/L |
| Disinfectant | ozone + chloramine |
| Source and treatment | Surface water, per the EPA SDWIS federal record · Pre-ozonation for taste, odour and byproduct control, pre pH adjustment, coagulation, flocculation, sedimentation and rapid sand filtration, reducing agents, chlorine dioxide and post-chlorination with chloramines as the residual, fluoridation, with an orthophosphate inhibitor and pH adjustment · No softening step. |
Not in the report: alkalinity, corrosion index, iron, manganese and total dissolved solids.
SOURCE · Louisiana Department of Health, state-prepared 2025 base CCR for the City of Shreveport (PWS LA1017031), treated secondary contaminants, with the EPA SDWIS federal treatment record · How we source these numbers
Canopy runs the residential cycle nearly year-round, with honeydew through the growing season and tannin at leaf fall, so shaded glass needs roughly double the frequency of open elevations. The spring pollen period is dead time worth waiting out, and the service afterwards is the heaviest of the year. Summer humidity keeps mildew working on north-facing walls. Winter is mostly workable, interrupted abruptly rather than seasonally by occasional hard freezes.
LOUISIANA SEASON BY SEASON →Shreveport is the outlier among Louisiana's large cities, taking surface water from Cross Lake — a reservoir inside the city limits, so the catchment is urban rather than remote. The state's 2025 treated-water sample puts hardness at 23.5 mg/L, consistent with a soft surface supply. That makes it a different proposition from the groundwater cities south of it, and shifts the work onto canopy honeydew, pollen and the diesel film of a rail and distribution economy.
Shreveport is the outlier among Louisiana's large cities in taking surface water rather than groundwater, drawing on Cross Lake — a reservoir inside the city limits rather than a distant impoundment.
That proximity is unusual and it has a practical consequence: the watershed is urban and suburban rather than remote forest, so the raw water carries what a populated catchment delivers.
The state's 2025 sample of the city's treated water put hardness at 23.5 milligrams per litre, soft by any standard.
Soft surface water is what would be expected here, and it puts Shreveport in a different category from the groundwater cities to the south, where the Chicot and Southern Hills aquifers set quite different conditions.
The practical upshot if it holds is that mineral spotting is a minor problem in this city and the residue that matters is organic and airborne instead.
Northwest Louisiana humidity is high but slightly less relentless than the coast, which lengthens the window in which glass actually dries and makes the working day more predictable than further south.
Mature canopy across Highland and South Highlands is the main residential variable — honeydew, tannin and continuous drip on the glass beneath, sticky work that pressure does not fix.
Spring pollen from pine and oak across the region gives one heavy period where residential washing is not worth doing, and the reset afterwards is the heaviest service of the year.
The rail and distribution economy puts diesel film and roadside grit on commercial frontages along the corridors at a level the city's size would not otherwise produce.
Winter is mild but not free of hard freezes, and the occasional ice event closes exterior work abruptly rather than gradually — a different pattern from the reliable seasonal shutdown further north.
Canopy and pane count price the historic residential districts well above their glass area, and those districts are also where the recurring high-value work is. Downtown and riverfront commercial prices on access and out-of-hours scheduling. The freight corridors price on frequency, since grit and diesel film mean the lower half of a frontage is the recurring job. The long working season is the market's structural advantage.
Ordinary residential glass is a straightforward homeowner job and the supply is unlikely to cause difficulty. Honeydew is the exception that catches people out — sticky, re-wetting and unresponsive to force, it wants detergent and time. The Highland and South Highlands districts hold original divided-light sash with old putty that will not survive confident scraping. Commercial frontages along the freight corridors need a degreasing step that residential work does not.
OPEN COST ESTIMATOR →2025 annual mean at the Shreveport / Airport monitor, 1425 Airport Drive, 8.7 km north-east of the city (EPA site 22-015-0008).
2025 annual mean at the Shreveport / Calumet monitor, 2601 Desoto St., 1.5 km north-east of the city (EPA site 22-017-0008).
Largest air release: Calumet Shreveport Refining LLC, 3333 Midway ST (petroleum), inside the city limits, 121,862 lb in 2024.
Shreveport's utilities chapter makes it unlawful to open a hydrant, pull its cap or draw water from it without permission from the Department of Water and Sewerage, and only the regular hydrant wrench may be used. Unpermitted draws are fined under the city's water penalty schedule (§94-166).
Shreveport Code §94-62: drawing water from fire hydrants · checked September 2026
No one may introduce anything that is not entirely stormwater into Shreveport's storm drainage system, Cross Lake or any tributary of Cross Lake, unless it falls in an excepted class such as a permitted discharge. Even pavement wash water at service stations must be free of soap, detergent and solvent.
Shreveport Code §34-164: general prohibitions · Shreveport Code §34-167: gas and service station discharge exclusion · checked September 2026
Shreveport's Unified Development Code regulates buildings and sites in its mapped Historic Preservation Overlay Districts, and any improvement involving their exterior features falls under that regulation.
Shreveport Unified Development Code §21.4: regulation within an HPOD · checked September 2026
Loblolly pine and longleaf pine produce the dominant statewide spring contaminant. Peak yellow-pollen pulse late March in the southern half, mid-April in the northern half. Wet-only handling. No scraping, no dry-brushing — drives pollen deeper into glass-surface micro-texture. Heaviest booking-pressure stretch of the year statewide.
The state's 2025 treated-water sample reads 23.5 mg/L: soft water, as a surface reservoir supply would suggest. What matters more is the category difference: this is the only large Louisiana city in this batch on surface water, and the groundwater cities to the south sit on aquifers with quite different mineral, iron and chloride characteristics.
Residential window cleaning in Shreveport typically runs $8–13 per pane or $240–430 for a standard single-story exterior. Canopy and pane count price the historic residential districts well above their glass area, and those districts are also where the recurring high-value work is.
Shreveport's drier, frost-free months are April and July to October, by NOAA's 1991–2020 normals for the Shreveport station, where March brings the most rain. The calendar on this page marks April (after the March 5 bloom) and October (after smoke season and before frost). Frost nights usually run from November 18 to March 9. Normal highs reach 90°F in June to September.
Usually yes: City of Shreveport Department of Water and Sewerage publishes hardness of 23.5 mg/L, low enough that tap-rinsed glass tends to dry clean. Iron, manganese, sodium and chloride all sit under this site's flags (highest: sodium up to 32.4 mg/L). Treatment starts with pre-ozonation for taste, odour, byproduct control and pre pH adjustment.
In Shreveport the dominant residue patterns include honeydew and tannin under mature canopy and diesel film and grit along the rail and distribution corridors. Canopy runs the residential cycle nearly year-round, with honeydew through the growing season and tannin at leaf fall, so shaded glass needs roughly double the frequency of open elevations.
Ordinary residential glass is a straightforward homeowner job and the supply is unlikely to cause difficulty. Honeydew is the exception that catches people out — sticky, re-wetting and unresponsive to force, it wants detergent and time. The Highland and South Highlands districts hold original divided-light sash with old putty that will not survive confident scraping.
The commercial core, early 20th-century frontage and mid-century office alongside riverfront casino development. Large continuous elevations and contract-shaped work. Highland Historic District and South Highlands have their own housing stock and glazing as well.
Just over the Louisiana line