Lake Charles water is 79.9 mg/L hard. The refining and gas corridor leaves an oily film, and hygroscopic salt film re-wets on the glass overnight.
Lake Charles treats its Chicot aquifer water to a moderately hard 79.9 mg/L, so the tap is not the main problem. The refining and gas corridor leaves an oily film that needs degreasing, a salty film on the glass re-wets overnight, and Gulf humidity keeps mildew growing all year. February to May and October are the best months, and a single-story exterior runs $200 to $380.
No figure published by the city was located, and the aquifer characterisation available describes source water rather than treated supply. What it does suggest is a harder, more mineralised and mildly acidic groundwater than most of Louisiana's surface-supplied cities — with chloride in the mix. The practical reading is to expect a salt-type film as much as a carbonate one, and to be cautious with acidic products, because an acidic cleaner on an already-acidic supply has nothing tempering it and coated glazing is what pays for that.
| Hardness | 79.9 mg/L as CaCO₃ Single treated-water sample of 79.9 mg/L (May 2021), carried in the city's 2024 report and the state's 2025 draft; moderately hard on the USGS ladder. Raw well samples ran 66.8 to 198.1 in 2024, as published by City of Lake Charles Water Division. |
|---|---|
| Iron | 0–0.06 mg/L |
| Manganese | 0–0.02 mg/L |
| Sodium | 76.7 mg/L |
| Disinfectant | free chlorine |
| Source and treatment | Groundwater, per the EPA SDWIS federal record · Slat-tray aeration, permanganate, greensand and pressure sand filtration with sedimentation for iron and manganese, pre-chlorination, fluoridation, with orthophosphate and polyphosphate inhibitors and post pH adjustment · No softening step. |
Not in the report: pH, alkalinity, corrosion index, chloride and total dissolved solids.
SOURCE · City of Lake Charles 2024 Annual Consumer Confidence Water Quality Report (PWS LA1019029), treated-water secondary table, with the state's 2025 base CCR data and the EPA SDWIS federal treatment record · How we source these numbers
Humidity runs the cycle from March into November and keeps mildew active on anything shaded. Industrial film near the corridor accumulates independently of season and needs its own shorter interval. The overnight re-wetting of salt film makes an early finish worth more than a later one. Tropical weather generates concentrated unscheduled demand rather than a seasonal pattern, and the mild winter keeps this a near year-round market.
LOUISIANA SEASON BY SEASON →Lake Charles is on the Chicot aquifer, which a federal survey characterises as hard, sodium- and calcium-dominant, and mostly mildly acidic — 35 of 60 sampled wells fell below the federal secondary pH range. The city's treated water measured 79.9 mg/L in its one published hardness sample, so that describes the aquifer rather than the tap. Acidic supply inverts the usual advice on coated glass. Around it: one of the heaviest refining and liquefied gas concentrations in the country, a rebuilt glazing stock full of impact-rated units, and the Charpentier district's ships'-carpenter houses.
Lake Charles draws groundwater from the Chicot aquifer, the same system that supplies much of southwestern Louisiana, and that aquifer is characteristically hard rather than soft.
A federal survey of domestic wells across the Chicot found conditions that explain a lot about working here: dissolved solids reaching 858 milligrams per litre at the extreme, specific conductance ranging from 17 to 1,420 microsiemens, and sodium and calcium as the dominant cations.
The same survey found that 35 of 60 sampled wells had pH below the federal secondary range of 6.5 to 8.5 — most of the water tested was mildly acidic.
Acidic supply is worth knowing about because it inverts the usual advice. An acidic cleaner on already-acidic water has nothing buffering it, and on coated modern glazing that is exactly the combination that does damage.
Chloride is the other Chicot finding with local relevance, with one sampled well exceeding the 250 milligram secondary limit. Chloride-bearing water leaves a salt-type film rather than carbonate scale.
That matters on this coast because salt film is hygroscopic — it pulls moisture back from the air overnight and reactivates rather than drying to something that brushes off.
The city's own report carries one treated-water hardness figure, 79.9 mg/L from a 2021 sample, so everything above describes the aquifer the wells draw on rather than the water at the tap.
Above ground the industrial corridor is the dominant fact. This is one of the heaviest concentrations of refining and liquefied gas processing in the country, and glass near the plants carries an oily film that needs degreasing rather than more pressure.
Hurricane exposure has reshaped the building stock visibly. A great deal of glazing across the city is recent replacement, much of it impact-rated laminated units that are thicker, coated and expensive to replace.
The Charpentier district is the city's genuine rarity — a large concentration of late 19th-century houses built by ships' carpenters, with detail and glazing that does not exist in this form anywhere else.
Humidity is extreme and sustained, so mildew on shaded elevations and in frame channels is continuous rather than seasonal.
The industrial corridor is the commercial backbone of this market and prices on site access, insurance and the degreasing step rather than on area. Impact-rated glazing raises the risk premium on any job where abrasion is possible. Heritage work in the Charpentier district prices on pane count and care. Post-storm periods are unscheduled and concentrated, and capacity held in reserve for them is worth more than rate.
Routine work is manageable, with two specific cautions that matter more here than in most markets. Do not reach for a stronger acid: the supply may already be acidic and much of the city's glazing is recent coated impact-rated units that will not recover from etching. And industrial film is a degreasing job — a general-purpose cleaner moves it around and a dry cloth sets it. Charpentier district glazing is original, irreplaceable in kind, and should be left to someone who can identify it.
OPEN COST ESTIMATOR →2025 annual mean at the Westlake monitor, 2646 John Stine Road, 10 km north-west of the city (EPA site 22-019-0008).
Largest air release: Citgo Petroleum Corp, 1601 HWY 108 E (petroleum), 1.4 km outside the city limits, 546,607 lb in 2024.
Lake Charles makes it unlawful for anyone not authorized by the city council, the public works director, the fire chief or the property owner to open a fire hydrant and take water from it, or to open one and let water run to waste. Only public works and fire department staff, and the owner, can be given that authority, so a cleaner needing a fill point has to arrange it through the city.
Lake Charles Code of Ordinances Sec. 8-3.21: hydrant use by unauthorized persons · checked September 2026
Lake Charles names this work outright: its stormwater ordinance lists water from pressure washing, steam cleaning or hand scrubbing of building exteriors, walls, sidewalks and other outdoor surfaces as an illegal discharge to the city storm drains. Only stormwater may go in unless a permit or approved best-management practice covers the discharge.
Lake Charles Code §21-210: the illegal-discharge list, pressure washing and hand scrubbing included · checked September 2026
In the Charpentier District, the Margaret Place District and on designated landmarks, a material change in exterior appearance needs a certificate of appropriateness from the Historic Preservation Commission. The zoning code counts the type and style of all windows among the protected exterior features, so replacement sash there goes through the commission first.
Lake Charles Code §24-5-307: Charpentier and Margaret Place districts, appropriateness review · 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.
Open-Gulf salt aerosol on Cameron Parish and Grand Isle waterfront stock. Brackish-bayou aerosol on Plaquemines, St. Bernard, Lafourche, Terrebonne residential. Wet-rinse-first protocol. Monthly visit frequency standard on high-end coastal and bayou-front residential. Pattern continuous with Mississippi and Alabama Gulf Coast.
Lake Charles runs on City of Lake Charles Water Division groundwater at a published 79.9 mg/L (CaCO₃) — single treated-water sample of 79.9 mg/L (May 2021), carried in the city's 2024 report and the state's 2025 draft; moderately hard on the USGS ladder. Raw well samples ran 66.8 to 198.1 in 2024.
Residential window cleaning in Lake Charles typically runs $7–12 per pane or $200–380 for a standard single-story exterior. The industrial corridor is the commercial backbone of this market and prices on site access, insurance and the degreasing step rather than on area.
Lake Charles's drier, frost-free months are February to May and October, by NOAA's 1991–2020 normals for the Lake Charles station, where July brings the most rain. The calendar on this page marks March (after the February 20 bloom), April (before frost) and October (after smoke season). Frost nights usually run from December 7 to February 14.
Yes, if the rinse is squeegeed off before it dries: City of Lake Charles Water Division publishes hardness of 79.9 mg/L, between this site's two dissolved-solids flags. Treatment starts with slat-tray aeration, permanganate, greensand and pressure sand filtration with sedimentation for iron.
In Lake Charles the dominant residue patterns include oily industrial film from the refining and gas corridor and hygroscopic salt film re-wetting overnight. Humidity runs the cycle from March into November and keeps mildew active on anything shaded. Industrial film near the corridor accumulates independently of season and needs its own shorter interval.
Routine work is manageable, with two specific cautions that matter more here than in most markets. Do not reach for a stronger acid: the supply may already be acidic and much of the city's glazing is recent coated impact-rated units that will not recover from etching. And industrial film is a degreasing job — a general-purpose cleaner moves it around and a dry cloth sets it.
A large district of late 19th-century houses built by ships' carpenters without formal architects, producing a local style found nowhere else. Original glazing in quantity, ornate detail and conservation-grade pacing. Downtown and Ryan Street and The lakefront have their own housing stock and glazing as well.
Just over the Louisiana line