Window Washing in Columbus

Columbus runs a genuinely three-part water system, so its published 120 mg/L is a system figure and a given tap can differ from it. The utility operates two surface plants drawing from separate river and reservoir sources and a third plant on a well field, so different parts of the city receive water of different origin — and the origins are not chemically equivalent.

At least part of that treatment involves softening rather than straightforward filtration and disinfection, which compounds the problem with inherited numbers. A softening plant's raw and finished values differ materially, so a figure quoted online has two ways of being wrong here: it may describe the wrong plant, or the water before softening.

The city publishes the figure and, unusually, publishes the reason for it: Columbus softens its water to an average of 120 mg/L, about 7 grains per gallon, and states that this is deliberately held there for corrosion control because very soft water attacks household plumbing. That makes the number a treatment target the utility is steering toward rather than a property of the rivers and wells behind it.

German Village is an unusual working environment because preservation rules actually bite. Replacement glazing is far less common there than in comparable districts, which means original nineteenth-century glass is the realistic default rather than a possibility, and the brick street surfaces add a ladder-footing consideration that flat asphalt does not.

The university district concentrates an enormous volume of glass into buildings that are only reachable during the summer turnover. That compresses a large share of the local multi-occupancy market into a few weeks, and crews that want that work plan their entire year around holding capacity for it.

Central Ohio's position gives it a longer exterior season than the Great Lakes cities to the north, with no lake-effect snow loading and a later first frost. The practical effect is a residential year that stays open into autumn, which in turn means the ragweed season — running from August until frost — overlaps a larger part of the working calendar here than it does further north.

Clintonville's canopy is heavy enough to be the dominant residue driver for a large residential district. Sap, leaf cast and pollen on upper sash respond to frequency and detergent rather than to anything done about the water, and a quote that prices those streets like open suburban stock will under-serve them.

Cleveland and the northeast snow belt counties (Cuyahoga, Lake, Geauga, Ashtabula) see the heaviest seasonal salt application in the state and the corresponding road-aerosol residue on ground-floor glass. Profile is comparable to suburban Detroit. The southern half of the state (Columbus and south) sees lighter salt and a correspondingly shorter post-winter spring cleaning season.

The I-71 corridor through Cleveland, the I-75 corridor through Toledo and Dayton, and the I-90/I-71 confluence through Cleveland deposit auto-industry and freight particulate similar to the Detroit corridors. Akron and Youngstown carry a residual industrial-era grime profile from the rubber and steel eras that older masonry housing still sheds onto adjacent glass.

Dayton at a published 155 mg/L (hard) produces the heaviest sprinkler-overspray staining of any Ohio metro. Columbus, at a published 120 mg/L (moderately hard), sees lighter staining. The unglaciated southeast Ohio well-water houses publish nothing; test them. The summer overspray season requires a citric or phosphoric pre-treatment pass on most ground-floor and patio-door work south of I-80.

Cottonwood plantings along the Cuyahoga, the Scioto, and the Ohio River produce a seed-fluff wave in late May and early June matching the Detroit and Chicago profile. The hardwood pollen wave (oak, maple, sycamore) is heavy statewide and concentrated in the inner-ring suburbs of all three major metros.

Well-water households across the unglaciated southeast (Athens, Hocking, Vinton, Meigs counties) and the central Ohio limestone belt carry elevated iron at the wellhead. Sprinkler overspray and hose-down work deposits an orange-rust tint on lower-third glass that requires a phosphoric or oxalic pass, with the same masonry-etching caveats that apply in outstate Michigan. Concentrated outside the major metro service areas.

The Ohio River valley around Cincinnati runs at sustained dew points in the upper seventies for much of the summer. Overnight condensation on east-facing exposures produces a faint mineral-and-organic film by morning that is not seen in the same volume north of about I-70. Clears with a normal wash but accelerates the cleaning cadence on the affected exposures.