Window Washing in Memphis
Memphis runs on groundwater at 12 to 130 mg/L hard, mould and mildew film grow on shaded and north-facing glass, and pine and oak pollen fill the spring.
Memphis runs on soft groundwater, so the tap is not what fails a job here; mould and mildew on shaded and north-facing glass are. Pine and oak pollen fill the spring, which makes June and August to October the better months to wash. Airport logistics buildings and heritage homes are priced very differently in this market, and a single-story exterior runs $300 to $550.
What the water means for the glass
Memphis is soft, and by a wider margin than most people expect from a limestone state — MLGW's own report averages 48 mg/L. The mineral load is simply not the thing that will fail a job here. Two other numbers in the same table matter more: calcium sits near 11 mg/L against an alkalinity of 54, which is a mildly aggressive rather than depositing water, and a phosphate inhibitor is dosed to protect plumbing from exactly that. Residue on Memphis glass is overwhelmingly airborne and organic, and it responds to dwell time and a surfactant rather than to anything acidic.
Memphis tap water, by the numbers
| Hardness | 12–130 mg/L as CaCO₃ No band label published; the 48 mg/L average is SOFT on the USGS ladder. |
|---|---|
| pH | 7.2 (range 6.1–7.9) |
| Alkalinity | 54 mg/L as CaCO₃ (range 18–142) |
| Iron | 0.01 mg/L (range 0.01–0.29) |
| Sodium | 9.8 mg/L (range 7.5–13.7) |
| Chloride | 4.6 mg/L (range 2.4–6.2) |
| Disinfectant | free chlorine |
| Source and treatment | Memphis Sand aquifer, more than 134 wells at 350 to 1,100 feet · Aeration, filtration and disinfection, with a phosphate corrosion inhibitor · No softening step. |
Not in the report: corrosion index, manganese and total dissolved solids.
SOURCE · Memphis Light, Gas and Water 2023 Water Quality Report (mlgw.com), with the EPA SDWIS federal treatment record, PWS TN0000450 · How we source these numbers
When a wash holds
What sets the cleaning clock
With mineral largely out of the picture, the clock is biological and it runs fast. Mid-South humidity keeps north-facing and shaded glass damp long enough for mould and mildew film to establish in weeks, and the spring pine and oak load lands on surfaces that are already holding moisture. The practical consequence is that shaded elevations need their own interval and the sunny front of the same building does not.
TENNESSEE SEASON BY SEASON →What's specific to Memphis
Memphis drinks the Memphis Sand aquifer and federal sampling of MLGW's own well fields puts median hardness at 46 mg/L — soft enough that tap rinsing works, which is a real commercial advantage and rare in the South. MLGW's own 2023 report puts hardness at 48 mg/L on average, 12 to 130 across the system. The adversary here is biological rather than mineral: humidity keeps shaded glass damp and mildew film returns in weeks. Commercially the city splits between high-volume logistics glazing around the FedEx hub and conservation-grade heritage residential in Central Gardens and Chickasaw Gardens.
MLGW draws the Memphis Sand aquifer through more than 134 wells at depths between 350 and 1,100 feet, pumping about 120 million gallons a day, and the treatment is only aeration, filtration and disinfection — there is no softening step and none is needed. Its own annual report puts hardness at 48 mg/L averaged across the plants, spanning 12 to 130, with total trihalomethanes under 9 ppb, far below the 80 ppb federal limit.
That softness is the single biggest operational advantage in this market. Tap water rinses clean here, so the pure-water equipment that is mandatory in a hard-water city is optional in Memphis — which changes both the capital a crew needs and what a customer is actually paying for.
The advantage is not uniform across the system. Federal work at the Davis well field found hardness in one production well climbing from 90 to 292 mg/L over two decades as shallow alluvial water leaked down through the confining clay, and the alluvium runs around 285 mg/L against the aquifer's 34. A well field can drift, and the neighbourhoods it serves drift with it.
Mid-South humidity is the real adversary. Shaded and north-facing glass stays damp enough long enough for mould and mildew film to establish within weeks, and that is a biological film rather than a mineral one — it needs a different chemistry and it returns on its own schedule regardless of how clean the pane was left.
Central Gardens and Chickasaw Gardens hold a concentration of pre-1940 heritage glazing unusual for a city of this size, including leaded and stained work. Early glass is not flat and leaded came joints do not tolerate driven water, so the pacing on those properties is conservation work and should be quoted as such.
The FedEx world hub and the logistics corridor around it give Memphis a commercial book weighted toward large, repetitive, low-rise industrial glazing. That work rewards route efficiency and volume pricing, and it is almost the opposite discipline from the heritage residential side of the city.
How old the glass is
- Before 1940 · 8%wood sash and older glass
- 1940–1959 · 28%steel casements, early aluminium
- 1960–1979 · 32%aluminium sliders, often single-pane
- 1980–1999 · 21%double-pane units become standard
- 2000–2009 · 7%vinyl frames, low-E spreading
- 2010 or later · 5%low-E common: gentle cleaners only
The city, by neighborhood
What window cleaning costs in Memphis
Two books with different economics. Logistics and distribution property around the airport and the FedEx hub is high-volume, low-complexity commercial work priced on area and frequency. Heritage residential is the opposite: priced on time, skill and risk, with conservation-grade pacing on glass that cannot be replaced like for like. Quoting either at the other's rate loses money in one direction or the other.
Doing it yourself
Soft water plus accessible housing means a homeowner can get a genuinely good result on most Memphis glass, and it would be dishonest to pretend otherwise. The exception is the heritage stock. Central Gardens and Chickasaw Gardens carry leaded, stained and wavy single-pane glass where the failure modes are permanent — a blade on uneven early glass, or water driven into a leaded came joint, is damage rather than a redo.
OPEN COST ESTIMATOR →2024 annual mean at the Alabama Ave. Station monitor, 416 Alabama Avenue, 8.1 km north-west of the city (EPA site 47-157-0024).
2025 annual mean at the Near Road Site at Southwest Tennessee Community College monitor, 5767 Macon Cove (Near Road Site), 10.6 km north-east of the city (EPA site 47-157-0100).
Largest air release: PMC Biogenix Inc, 1231 Pope ST (chemicals), inside the city limits, 672,405 lb in 2024.
In Memphis, MLGW's service policy bars contractors from drawing any water from a city or county fire hydrant except under its special-use terms: the water must pass through a hydrant meter issued by MLGW, the operator has to carry the permit at all times, and a refundable deposit covers the meter and equipment.
MLGW 2025 Service Policy §27.12 and §30.2.3–30.2.4: use of water from fire hydrants · checked September 2026
Memphis's stormwater chapter makes it unlawful to dispose of contaminants into the city storm system, and its list names soaps, detergents, ammonia, degreasers, steam-cleaning wastes and heated water. Plain potable water and lawn watering are allowed discharges, so a soap-free rinse passes while bucket water does not.
Memphis Code §13-40-5: improper disposal into the MS4, the contaminant list · Memphis Code §13-40-6: allowable discharges · checked September 2026
In Memphis's local historic districts (Central Gardens, Vollintine-Evergreen, Glenview and more) window replacement needs a Landmarks Commission certificate of appropriateness, often issued by staff as a minor COA. Approvals require matching the original size and grid with true or simulated divided lights and bar snap-in muntins; one 2024 owner who swapped windows first got a stop-work order.
Memphis Landmarks Commission, COA 2023-098: Central Gardens window replacement conditions · Memphis Landmarks Commission staff report, COA 2024-135: windows replaced without a COA · checked September 2026
What actually shows up on Memphis glass
Peak yellow-pine-pollen pulse in late March. Wet-only handling. Do not scrape or run aggressive wash; pollen lifts cleanly with water plus light alkaline soap.
Memphis, answered
How hard is the water in Memphis, Tennessee?＋
Memphis runs on Memphis Light, Gas and Water groundwater at a published 12–130 mg/L (CaCO₃), averaging 48 — no band label published; the 48 mg/L average is SOFT on the USGS ladder. Memphis is soft, and by a wider margin than most people expect from a limestone state — MLGW's own report averages 48 mg/L. The mineral load is simply not the thing that will fail a job here.
How much does window cleaning cost in Memphis?＋
Residential window cleaning in Memphis typically runs $10–16 per pane or $300–550 for a standard single-story exterior. Two books with different economics. Logistics and distribution property around the airport and the FedEx hub is high-volume, low-complexity commercial work priced on area and frequency.
When is the best time of year to clean windows in Memphis?＋
Memphis's drier, frost-free months are June and August to October, by NOAA's 1991–2020 normals for the Memphis International Airport station, where March brings the most rain. The calendar on this page marks June (after the March 22 bloom and after smoke season). Frost nights usually run from November 16 to March 16. Normal highs reach 90°F in July and August.
Can I rinse windows with Memphis tap water?＋
Not as the final rinse: Memphis Light, Gas and Water publishes hardness of 12–130 mg/L, enough to spot as it dries, so finish with pure water. Water left to dry leaves mineral scale; fresh spots lift with a mild acid. It draws on Memphis Sand aquifer, more than 134 wells at 350 to 1,100 feet.
Why do my windows look dirty so quickly in Memphis?＋
In Memphis the dominant residue patterns include mould and mildew film on shaded and north-facing glass and pine and oak pollen through the spring wave. With mineral largely out of the picture, the clock is biological and it runs fast.
Do I need a professional to clean my windows in Memphis?＋
Soft water plus accessible housing means a homeowner can get a genuinely good result on most Memphis glass, and it would be dishonest to pretend otherwise. The exception is the heritage stock.
What sets Downtown / South Main apart for window cleaning in Memphis?＋
Converted warehouse and commercial stock with large industrial sash and post-2000 residential conversions above. Tall single-pane openings at awkward heights — pole work rather than ladder work on much of it. Central Gardens and Cooper-Young have their own housing stock and glazing as well.
Other cities we cover in Tennessee
Nearby cities in neighboring states
Just over the Tennessee line