Columbus softens its water at the plant, yet glass doors and chrome still spot. Here is what the city's 2025 numbers say plant by plant, how Del-Co water in Powell compares, and how to keep fixtures clear.
Many Columbus residents are surprised to hear their water is softened before it reaches the tap. The city treats it with lime to pull out calcium and magnesium, the minerals behind scale. Even so, a glass shower door left to air dry will cloud up within weeks, and the base of a kitchen faucet grows a pale crust.
The reason is that softened is not the same as soft. This guide explains where Columbus water comes from, how hard it still is at each plant, and the cleaning habits that keep the film from winning.
Columbus draws from the Scioto River, Big Walnut Creek and wells in the sand and gravel of the Scioto River Valley. Which source you drink depends on which plant feeds your neighborhood. The Dublin Road plant, fed by the Griggs and O'Shaughnessy reservoirs, supplies the northwest and southwest. Hap Cremean, on Hoover Reservoir water, supplies the Ohio State area and the north. Parsons Avenue, on wells, supplies the southeast.
After softening, the city's 2025 averages were about 125 ppm (7.3 grains per gallon) from Dublin Road, 123 ppm (7.2 gpg) from Parsons Avenue and 98 ppm (5.7 gpg) from Hap Cremean. On most scales that is moderately hard: not severe, but enough to leave visible spots wherever water dries.
Dublin, Upper Arlington and Grandview Heights all sit inside the Columbus water service area on the city's map, and New Albany contracts with Columbus for its water, so the same plant numbers apply there.
Powell is different. Its water comes from the Del-Co Water Company, which reports about 7 to 8 grains per gallon, or 120 to 140 mg/L, after treatment. That puts Powell homes at the hard end of the Columbus-area range, similar to or a little harder than Dublin Road water.
Mineral film forms anywhere water evaporates instead of draining away. In Columbus homes the usual spots are glass shower doors, chrome faucets and drains, the base of the kitchen faucet, the dishwasher door edge and the glass of a tea kettle.
Two common complaints get blamed on the tap water, and Columbus Water & Power says neither comes from it. The pink, gray or black film on toilets and wet shower tile is caused by airborne organisms that grow on damp surfaces; regular cleaning and good ventilation reduce it. A rotten egg smell at a sink usually comes from bacteria in the drain trap or faucet aerator, and cleaning them with chlorine bleach usually clears it up.
Knowing the difference helps: a mineral cleaner will not touch the pink film, and a disinfecting cleaner will not dissolve scale. Each needs its own approach.
A One-Time Deep Clean treats shower glass for hard water spots and details faucets around the handles and base, where film builds thickest. Recurring visits wipe glass, chrome and sinks each time, which is what keeps Columbus film from turning into scale.
Heavy, years-old buildup can etch glass, and etching cannot be cleaned away. If a door stays hazy after treatment, it is likely etched. The fix from there is prevention: daily squeegeeing and steady cleaning so the rest of the glass stays clear. Learn more in the deep cleaning guide.
Separate from hardness, Columbus started a Lead Service Line Replacement Program in 2024 to remove all public and private lead and galvanized service lines in the city by 2040. That is a pipe replacement program, not a cleaning issue, but if your older home is on the list, the city is the right contact for questions about your line.
The questions Columbus homeowners ask most often about this topic, answered plainly.
TotalCare Cleaning will service Columbus and surrounding areas with background-checked cleaners and is insured up to $1 million. Re-clean guarantee: if we missed something, tell us by the end of the next day and we come back to fix it. Beyond Clean. TotalCare.
