Most North Liberty homes need less water treatment than they get sold. The city's plant has run reverse osmosis and nanofiltration since 2018, and tap hardness fell from about 10 grains per gallon to roughly 5–6. Kind Water Co installs under-sink RO here for $800 tank-style or $900 tankless — and will tell you plainly when to skip it.
North Liberty draws from the Jordan and Silurian aquifers, and since the 2018 treatment plant came online the city has been running reverse osmosis and nanofiltration on the municipal side. Hardness at the tap went from about 10 grains per gallon to roughly 5–6 (about 85–103 mg/L), and when the plant opened the city advised residents with softeners to dial their settings down from 10 grains to 5 or 6. Only a short list of Iowa utilities treat with membranes at all — North Liberty, West Liberty and Atkins among them — and that plant has earned the compliment. The rest of the hardness story is on our North Liberty water page.
What matters here is the consequence. A home reverse osmosis system in North Liberty is doing the same category of work the plant already did, at the last four feet of pipe instead of the first mile. That is a real job, and some households want it done. It is also smaller than most of this industry admits, so the rest of this page is an audit, not a pitch.
Here is the whole decision in one place: what the utility covered, what a system at your sink contributes, and what nobody on North Liberty city water should be paying for.
| Water job | The city already does this | Your home RO adds this | Nobody on city water here needs this |
|---|---|---|---|
| Hardness and scale | Membranes cut the tap from about 10 gpg to roughly 5–6 | Nothing. An RO treats one faucet, not the pipes or the heater | — |
| Dissolved solids in what you drink | Treated at the plant, then piped to your address | A second, dedicated pass at the tap you drink from. NSF/ANSI 58, the standard written for RO, requires at least 75% dissolved-solids reduction to certify to it — a rule about the standard itself | — |
| Nitrate | No North Liberty figure we can cite, so we won't quote one | Iowa State University Extension notes nitrate is odorless and tasteless, and that reverse osmosis, distillation and anion exchange remove it | Guesswork. A test at your sink is the only honest number |
| Sediment | — | — | A $500 pre-sediment filter. Wells are its legitimate use; carbon backflushes itself, so city water rarely needs one |
| Disinfection hardware | Municipal treatment and disinfection | — | A $700 UV lamp. Well-water equipment; we do not put it on city water |
This happens often enough that it belongs in writing. If your water tastes fine to you, nothing odd is showing up in the glass, and a free test reads where we would expect for a city running membranes at the plant, the answer is no. Keep the $800. You still get the test results on paper, with the numbers we measured.
Two other honest no's. If what actually bothers you is spotted glassware, film on the shower door or scale inside the water heater, an under-sink RO will not touch any of it — that is the 5–6 grains still moving through every line in the building, and it is a softener question, not a drinking-water one. And if you are renting, or moving inside the year, a pitcher will carry you until you are somewhere you own. We would rather say that than sell around it.
The yes cases are specific enough that you can tell whether you are in one. Households that want the lowest dissolved-solids drinking water they can get at home — usually for coffee, tea, an aquarium, ice that tastes like nothing, or mixing baby formula — get a measurable improvement from a membrane at the sink, and a TDS reading before and after shows it plainly. Households tired of buying and hauling bottled water get their kitchen back. And homes just outside city limits on private wells, toward Tiffin or Solon, are in a different situation entirely: no municipal membranes, no municipal anything, and testing is the only way to know. Start with well water treatment if that is you.
Both filter the same way. The difference is where treated water waits, and what your cabinet can take.
Tank, $800. A small pressurized tank under the sink holds treated water so it is there when you open the faucet. It needs cabinet room and no electricity. It is also the only reverse osmosis we will put on a private well, because wells here run high dissolved solids and a tankless unit loses pressure fighting them.
Tankless, $900. No storage tank, so the cabinet stays open, and it makes water on demand. It does need an outlet under the sink, and in plenty of kitchens that outlet is taken by the garbage disposal or dies with a wall switch. A $300 garbage-disposal air switch moves disposal control to a counter button and frees the plug. That one is deliberately thin margin for us; it is not a money-maker, it is just the fix.
On a refrigerator or ice-maker line: we can run one for $300–$400, and you should hear both facts first. If your sink is in an island it is effectively impossible, and even in a standard layout it is roughly a coin flip whether the run works out, with no reliable way to predict it. A specialty or digital faucet is $200.
Every figure below is all-in — equipment, installation by licensed local plumbing professionals we vet, schedule, and stand behind, and taxes. Culligan, Kinetico and RainSoft publish no prices at all; that is simply a difference in how we do business.
Warranty is lifetime on parts, five years on media and one year on labor, and we are insured and bonded. Financing is available at 0%, military members and first responders take $100 off, and the first 50 miles from Marion are free travel, which puts North Liberty comfortably inside it. Regional context is in our Iowa reverse osmosis cost guide.
An under-sink RO is among the tidiest jobs in plumbing. A licensed plumbing professional taps the cold line, mounts the membrane and filter stack in the cabinet, ties the drain into the sink's existing line, and sets a small dedicated faucet at the deck — usually in the spare hole a sprayer or soap dispenser is using. One visit, one to two hours, no wall opened. It flushes for a few hours and you drink from it that day, then we handle one service visit a year. The equipment itself is described on our reverse osmosis page.
We test your North Liberty tap at your own kitchen sink for hardness, chlorine and dissolved solids, and read the results back in plain English — including the version where the reading is fine and we tell you to spend the money elsewhere. No sales marathon, no pressure, no expiring discount. Call or text 319-319-6566, email ryan@kindwaterco.com, or build an instant quote in about a minute. Kind Water Co is family-owned, founded in 2021 by Ryan Brunton, and based in Marion, roughly half an hour up the corridor.
We treat water across Johnson County, and the answer changes town by town: Coralville, where the plant does not soften at all; Iowa City, softened at the plant to about 3 grains; and Tiffin, where an RO treatment plant is still under construction.
A tank-style under-sink system is $800 installed and a tankless system is $900, both all-in: equipment, installation by a licensed plumbing professional, and taxes. Bundled with a softener and whole-home filtration it runs $2,850. Annual service is $199 a year on a tank home and $249 tankless, and 0% financing is available.
Often not, and we say so on site visits. North Liberty's plant has run reverse osmosis and nanofiltration since 2018, which is why tap hardness fell from about 10 grains per gallon to roughly 5 or 6. A home system is a final pass at your drinking tap, not heavy lifting. A free test settles it either way.
Households that want the lowest dissolved-solids drinking water they can get at home, usually for coffee, tea, ice, an aquarium or baby formula. Also anyone tired of hauling bottled water, and homes just outside city limits on private wells, which get no municipal treatment at all and should be tested before anything is bought.
No. Reverse osmosis treats one faucet, so it does nothing about the 5 to 6 grains of hardness still reaching your dishwasher, shower and water heater. Spotting and scale are a water softener's job. They are two machines solving two different problems, and plenty of North Liberty homes only want one of them.
Tankless frees the cabinet but needs an outlet under the sink, which the garbage disposal often occupies; a $300 air switch moves disposal control to the counter and frees the plug. Tank style needs cabinet room and no electricity, and it is the only reverse osmosis we install on a private well, where high dissolved solids cost a tankless unit pressure.
Whole-home water softening, filtration, and reverse-osmosis drinking water — professionally installed and built to last a lifetime.
Serving Marion, Cedar Rapids & surrounding Linn County communities
Kind Water Co is a d/b/a of Zero Cap Investments LLC · 2258 Bison St, Apt B, Marion, IA 52302
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