Iowa Falls has the hardest published municipal water figure we have found anywhere in Iowa. The state's sample database recorded 620 mg/L as calcium carbonate at the Iowa Falls sample tap on 3 January 2024 — 36.3 grains per gallon. The city's plant does a great deal, and none of it is softening.
| Iowa Falls at a glance | What the record shows |
|---|---|
| Who supplies the water | Iowa Falls Water Department, PWSID IA4260097, 5,146 people served (EPA SDWIS); 2024 Census city estimate 4,993 |
| Where it comes from | The Mississippian aquifer. The city's 2023 water quality report flags that aquifer as “highly susceptible to contamination” |
| Softened at the plant | No. EPA SDWIS lists seventeen treatment records — forced-draft aeration, anthracite, gravity and pressure filtration, permanganate for manganese, hypochlorite disinfection and fluoridation — and not one softening objective |
| Published hardness | 620 mg/L as calcium carbonate, or 36.3 grains per gallon, at the sample tap on 01/03/2024 (Iowa DNR Drinking Water Portal, analyte 84) |
Most softener manufacturers stop their scale at “very hard” somewhere above 10.5 grains per gallon. Iowa Falls is at more than triple that. Across the thirty-seven central Iowa systems we reviewed against state sample data, nothing else came close — Grinnell peaked at 490 mg/L and Carroll at 402.
At this level, hardness stops being a background annoyance and starts setting the replacement schedule for everything water touches. Scale builds on a water heater element fast enough to matter on the bill. Dishwashers and washing machines age early. Soap and detergent do a fraction of what the label promises, because a good share of it is being spent binding minerals rather than cleaning. Nothing about that is unusual for the aquifer — it is simply what 620 mg/L does in a house.
It also means sizing matters more here than anywhere. A softener's capacity is consumed in proportion to the grains it removes, so a unit specified for average Iowa water will regenerate constantly in Iowa Falls, burn through salt, and wear out years early. This is a town where the XL build earns its price in a good many households.
Seventeen treatment records is a lot for a system this size, and reading them tells you what the source water carries. Forced-draft aeration and permanganate are there for iron and manganese. Anthracite, gravity and pressure filtration catch what the aeration oxidises. Hypochlorite handles disinfection, and fluoride is added for dental health.
That is a plant built around metals, not minerals — which is the ordinary Iowa pattern, because hardness is unregulated and iron staining generates complaints. Whatever iron slips past those filters ends up in softener resin, coating the bed and quietly costing capacity, so a softener here should be specified with the iron reading in hand as well as the hardness one.
The 2023 report also lists combined radium at 1.2 pCi/L and gross alpha between 2.4 and 2.9 pCi/L, both under their limits, alongside the note that the Mississippian aquifer is highly susceptible to contamination. Those are the city's own published figures, and a susceptibility rating is a statement about the aquifer's geology rather than about any result.
Every price is all-in: equipment, installation, taxes and a lifetime parts warranty.
Maintenance plans are $199 a year for a tank-RO home and $249 a year for a tankless-RO home. Diagnostic service calls are $199; a known-issue trip is $99 plus the part. There is 0% financing, and $100 off for military and first responders. Ask for the full written breakdown before booking, or start one at our instant quote.
Rural Hardin County homes draw the same Mississippian formation without the city's aeration and filtration in front of it, so iron and manganese arrive along with the hardness. Our well water setup is a dual-tank system at $3,450, or $3,800 with tank RO, with UV disinfection at $700 and sediment pre-filtration at $500 when the readings call for them. Tank RO rather than tankless on a well, because high dissolved solids cost a tankless unit its pressure. Start with free well water testing.
We are licensed and insured, and our softeners are built from NSF/ANSI 44 certified components and our reverse osmosis systems are certified to NSF/ANSI 58. Licensed local plumbing professionals we vet, schedule and stand behind do the installing. Every price is published and all-in, and we would rather test your water and tell you that you need less than you expected.
At 36 grains, guessing at a system size is expensive in both directions — too small and it never keeps up, too large and you paid for capacity you will not use. We come to you, measure hardness and iron at your own kitchen sink, and hand over the readings and a written quote before you decide anything, at no charge. Book your free in-home water test.
Ames · Marshalltown · Grinnell · Waverly
The Iowa DNR sample database recorded 620 mg/L as calcium carbonate at the Iowa Falls sample tap on 3 January 2024, which is 36.3 grains per gallon. That is the hardest published municipal figure we found across thirty-seven central Iowa systems, and the city does not soften, so it reaches your tap untouched.
No. EPA SDWIS lists seventeen treatment records for PWSID IA4260097 — forced-draft aeration, anthracite, gravity and pressure filtration, permanganate for manganese, hypochlorite disinfection and fluoridation — and not one softening objective. The plant is built around iron and manganese rather than hardness.
Often, yes. A softener's capacity is consumed in proportion to the grains it removes, so at 36 grains a unit sized for average Iowa water regenerates far more often, uses more salt and wears out years earlier. The XL build is $2,800, or $3,150 with reverse osmosis. The free test decides it.
The 2023 Iowa Falls water quality report flags the Mississippian aquifer as “highly susceptible to contamination.” That is a statement about the geology overlying the aquifer rather than about any test result. The same report lists combined radium at 1.2 pCi/L and gross alpha at 2.4 to 2.9 pCi/L, both under their limits.
A Kind Water Co softener is $2,500 all-in, including equipment, installation, taxes and a lifetime parts warranty, or $2,850 with reverse osmosis. The XL build, often the right choice at this hardness, is $2,800 or $3,150 with RO. Softeners use NSF/ANSI 44 certified components and RO systems are certified to NSF/ANSI 58, with 0% financing and $100 off for military and first responders.
Every number on this page comes from a public record. Here is where to open each one yourself.
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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